Expose additional fields needed by PrintRecommendationService GTS test

and move files into properly named directory.

Fixes: 28025769, 28214466
Change-Id: I14737515fc12525a1685a1a222f21913755ac988

15 files changed, 1544 insertions, 0 deletions

diff --git a/packages/PrintRecommendationService/Android.mk b/packages/PrintRecommendationService/Android.mk
new file mode 100644
index 000000000000..66cb0573aef0
--- /dev/null
+++ b/packages/PrintRecommendationService/Android.mk
@@ -0,0 +1,29 @@
+# Copyright (C) 2016 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+
+LOCAL_PACKAGE_NAME := PrintRecommendationService
+
+include $(BUILD_PACKAGE)
+
+LOCAL_SDK_VERSION := system_current
+
+include $(call all-makefiles-under, $(LOCAL_PATH))
diff --git a/packages/PrintRecommendationService/AndroidManifest.xml b/packages/PrintRecommendationService/AndroidManifest.xml
new file mode 100644
index 000000000000..0eb218c853ec
--- /dev/null
+++ b/packages/PrintRecommendationService/AndroidManifest.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+ * Copyright (c) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.printservice.recommendation">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowClearUserData="false"
+        android:label="@string/app_label"
+        android:allowBackup= "false">
+
+        <service
+            android:name=".RecommendationServiceImpl"
+            android:permission="android.permission.BIND_PRINT_RECOMMENDATION_SERVICE">
+
+            <intent-filter>
+                <action android:name="android.printservice.recommendation.RecommendationService" />
+            </intent-filter>
+        </service>
+
+    </application>
+
+</manifest>
diff --git a/packages/PrintRecommendationService/CleanSpec.mk b/packages/PrintRecommendationService/CleanSpec.mk
new file mode 100644
index 000000000000..c087cb88680f
--- /dev/null
+++ b/packages/PrintRecommendationService/CleanSpec.mk
@@ -0,0 +1,49 @@
+# Copyright (C) 2016 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# If you don't need to do a full clean build but would like to touch
+# a file or delete some intermediate files, add a clean step to the end
+# of the list.  These steps will only be run once, if they haven't been
+# run before.
+#
+# E.g.:
+#     $(call add-clean-step, touch -c external/sqlite/sqlite3.h)
+#     $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES/libz_intermediates)
+#
+# Always use "touch -c" and "rm -f" or "rm -rf" to gracefully deal with
+# files that are missing or have been moved.
+#
+# Use $(PRODUCT_OUT) to get to the "out/target/product/blah/" directory.
+# Use $(OUT_DIR) to refer to the "out" directory.
+#
+# If you need to re-do something that's already mentioned, just copy
+# the command and add it to the bottom of the list.  E.g., if a change
+# that you made last week required touching a file and a change you
+# made today requires touching the same file, just copy the old
+# touch step and add it to the end of the list.
+#
+# ************************************************
+# NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
+# ************************************************
+
+# For example:
+#$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/AndroidTests_intermediates)
+#$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/core_intermediates)
+#$(call add-clean-step, find $(OUT_DIR) -type f -name "IGTalkSession*" -print0 | xargs -0 rm -f)
+#$(call add-clean-step, rm -rf $(PRODUCT_OUT)/data/*)
+
+# ************************************************
+# NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
+# ************************************************
diff --git a/packages/PrintRecommendationService/MODULE_LICENSE_APACHE2 b/packages/PrintRecommendationService/MODULE_LICENSE_APACHE2
new file mode 100644
index 000000000000..e69de29bb2d1
--- /dev/null
+++ b/packages/PrintRecommendationService/MODULE_LICENSE_APACHE2
diff --git a/packages/PrintRecommendationService/NOTICE b/packages/PrintRecommendationService/NOTICE
new file mode 100644
index 000000000000..c5b1efa7aac7
--- /dev/null
+++ b/packages/PrintRecommendationService/NOTICE
@@ -0,0 +1,190 @@
+
+   Copyright (c) 2005-2008, The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
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+      "License" shall mean the terms and conditions for use, reproduction,
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+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      to the Licensor or its representatives, including but not limited to
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+      designated in writing by the copyright owner as "Not a Contribution."
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+      on behalf of whom a Contribution has been received by Licensor and
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+   2. Grant of Copyright License. Subject to the terms and conditions of
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+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
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+          of the NOTICE file are for informational purposes only and
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+          notices within Derivative Works that You distribute, alongside
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
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+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
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+
diff --git a/packages/PrintRecommendationService/res/values/donottranslate.xml b/packages/PrintRecommendationService/res/values/donottranslate.xml
new file mode 100644
index 000000000000..4cf0eaf4181b
--- /dev/null
+++ b/packages/PrintRecommendationService/res/values/donottranslate.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2016 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<resources>
+    <string name="app_label">Print Service Recommendation Service</string>
+</resources>
diff --git a/packages/PrintRecommendationService/res/values/strings.xml b/packages/PrintRecommendationService/res/values/strings.xml
new file mode 100644
index 000000000000..07d0004fa09b
--- /dev/null
+++ b/packages/PrintRecommendationService/res/values/strings.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  (c) Copyright 2016 Mopria Alliance, Inc.
+  (c) Copyright 2016 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+
+<resources>
+    <string name="plugin_vendor_hp">HP</string>
+    <string name="plugin_vendor_lexmark">Lexmark</string>
+    <string name="plugin_vendor_brother">Brother</string>
+    <string name="plugin_vendor_canon">Canon</string>
+    <string name="plugin_vendor_xerox">Xerox</string>
+    <string name="plugin_vendor_samsung">Samsung Electronics</string>
+    <string name="plugin_vendor_epson">Epson</string>
+    <string name="plugin_vendor_konika_minolta">Konika Minolta</string>
+    <string name="plugin_vendor_fuji">Fuji</string>
+</resources>
diff --git a/packages/PrintRecommendationService/res/xml/vendorconfigs.xml b/packages/PrintRecommendationService/res/xml/vendorconfigs.xml
new file mode 100644
index 000000000000..119943cd5f9f
--- /dev/null
+++ b/packages/PrintRecommendationService/res/xml/vendorconfigs.xml
@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  (c) Copyright 2016 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<vendors>
+    <vendor>
+        <name>@string/plugin_vendor_hp</name>
+        <package>com.hp.android.printservice</package>
+        <mdns-names>
+            <mdns-name>HP</mdns-name>
+            <mdns-name>Hewlett-Packard</mdns-name>
+            <mdns-name>Hewlett Packard</mdns-name>
+        </mdns-names>
+    </vendor>
+
+    <vendor>
+        <name>@string/plugin_vendor_lexmark</name>
+        <package>com.lexmark.print.plugin</package>
+        <mdns-names>
+            <mdns-name>Lexmark</mdns-name>
+            <mdns-name>Lexmark International</mdns-name>
+        </mdns-names>
+    </vendor>
+
+    <vendor>
+        <name>@string/plugin_vendor_brother</name>
+        <package>com.brother.printservice</package>
+        <mdns-names>
+            <mdns-name>Brother</mdns-name>
+        </mdns-names>
+    </vendor>
+
+    <vendor>
+        <name>@string/plugin_vendor_canon</name>
+        <package>jp.co.canon.android.printservice.plugin</package>
+        <mdns-names>
+            <mdns-name>Canon</mdns-name>
+        </mdns-names>
+    </vendor>
+
+    <vendor>
+        <name>@string/plugin_vendor_xerox</name>
+        <package>com.xerox.printservice</package>
+        <mdns-names>
+            <mdns-name>Xerox</mdns-name>
+        </mdns-names>
+    </vendor>
+
+    <vendor>
+        <name>@string/plugin_vendor_samsung</name>
+        <package>com.sec.app.samsungprintservice</package>
+        <mdns-names>
+            <mdns-name>Samsung</mdns-name>
+        </mdns-names>
+    </vendor>
+
+    <vendor>
+        <name>@string/plugin_vendor_epson</name>
+        <package>com.epson.mobilephone.android.epsonprintserviceplugin</package>
+        <mdns-names>
+            <mdns-name>Epson</mdns-name>
+        </mdns-names>
+    </vendor>
+
+    <vendor>
+        <name>@string/plugin_vendor_konika_minolta</name>
+        <package>com.kmbt.printservice</package>
+        <mdns-names>
+            <mdns-name>kmkmkm</mdns-name>
+            <mdns-name>Konica Minolta</mdns-name>
+            <mdns-name>Minolta</mdns-name>
+        </mdns-names>
+    </vendor>
+
+    <vendor>
+        <name>@string/plugin_vendor_fuji</name>
+        <package>jp.co.fujixerox.prt.PrintUtil.PCL</package>
+        <mdns-names>
+            <mdns-name>FUJI XEROX</mdns-name>
+        </mdns-names>
+    </vendor>
+</vendors>
diff --git a/packages/PrintRecommendationService/src/com/android/printservice/recommendation/PrintServicePlugin.java b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/PrintServicePlugin.java
new file mode 100644
index 000000000000..d604ef8a49ea
--- /dev/null
+++ b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/PrintServicePlugin.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.printservice.recommendation;
+
+import android.annotation.IntRange;
+import android.annotation.NonNull;
+import android.annotation.StringRes;
+
+/**
+ * Interface to be implemented by each print service plugin.
+ * <p/>
+ * A print service plugin is a minimal version of a real {@link android.printservice.PrintService
+ * print service}. You cannot print using the plugin. The only functionality in the plugin is to
+ * report the number of printers that the real service would discover.
+ */
+public interface PrintServicePlugin {
+    /**
+     * Call back used by the print service plugins.
+     */
+    interface PrinterDiscoveryCallback {
+        /**
+         * Announce that something changed and the UI for this plugin should be updated.
+         *
+         * @param numDiscoveredPrinters The number of printers discovered.
+         */
+        void onChanged(@IntRange(from = 0) int numDiscoveredPrinters);
+    }
+
+    /**
+     * Get the name (a string reference) of the {@link android.printservice.PrintService print
+     * service} with the {@link #getPackageName specified package name}. This is read once, hence
+     * returning different data at different times is not allowed.
+     *
+     * @return The name of the print service as a string reference. The localization is handled
+     *         outside of the plugin.
+     */
+    @StringRes int getName();
+
+    /**
+     * The package name of the full print service.
+     *
+     * @return The package name
+     */
+    @NonNull CharSequence getPackageName();
+
+    /**
+     * Start the discovery plugin.
+     *
+     * @param callback Callbacks used by this plugin.
+     *
+     * @throws Exception If anything went wrong when starting the plugin
+     */
+    void start(@NonNull PrinterDiscoveryCallback callback) throws Exception;
+
+    /**
+     * Stop the plugin. This can only return once the plugin is completely finished and cleaned up.
+     *
+     * @throws Exception If anything went wrong while stopping plugin
+     */
+    void stop() throws Exception;
+}
diff --git a/packages/PrintRecommendationService/src/com/android/printservice/recommendation/RecommendationServiceImpl.java b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/RecommendationServiceImpl.java
new file mode 100644
index 000000000000..9f6dad8f2e2a
--- /dev/null
+++ b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/RecommendationServiceImpl.java
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.printservice.recommendation;
+
+import android.content.res.Configuration;
+import android.printservice.recommendation.RecommendationInfo;
+import android.printservice.recommendation.RecommendationService;
+import android.printservice.PrintService;
+import android.util.Log;
+import com.android.printservice.recommendation.plugin.mdnsFilter.MDNSFilterPlugin;
+import com.android.printservice.recommendation.plugin.mdnsFilter.VendorConfig;
+import org.xmlpull.v1.XmlPullParserException;
+
+import java.io.IOException;
+import java.util.ArrayList;
+
+/**
+ * Service that recommends {@link PrintService print services} that might be a good idea to install.
+ */
+public class RecommendationServiceImpl extends RecommendationService
+        implements RemotePrintServicePlugin.OnChangedListener {
+    private static final String LOG_TAG = "PrintServiceRecService";
+
+    /** All registered plugins */
+    private ArrayList<RemotePrintServicePlugin> mPlugins;
+
+    @Override
+    public void onConnected() {
+        mPlugins = new ArrayList<>();
+
+        try {
+            for (VendorConfig config : VendorConfig.getAllConfigs(this)) {
+                try {
+                    mPlugins.add(new RemotePrintServicePlugin(new MDNSFilterPlugin(this,
+                            config.name, config.packageName, config.mDNSNames), this, false));
+                } catch (Exception e) {
+                    Log.e(LOG_TAG, "Could not initiate simple MDNS plugin for " +
+                            config.packageName, e);
+                }
+            }
+        } catch (IOException | XmlPullParserException e) {
+            new RuntimeException("Could not parse vendorconfig", e);
+        }
+
+        final int numPlugins = mPlugins.size();
+        for (int i = 0; i < numPlugins; i++) {
+            try {
+                mPlugins.get(i).start();
+            } catch (RemotePrintServicePlugin.PluginException e) {
+                Log.e(LOG_TAG, "Could not start plugin", e);
+            }
+        }
+    }
+
+    @Override
+    public void onDisconnected() {
+        final int numPlugins = mPlugins.size();
+        for (int i = 0; i < numPlugins; i++) {
+            try {
+                mPlugins.get(i).stop();
+            } catch (RemotePrintServicePlugin.PluginException e) {
+                Log.e(LOG_TAG, "Could not stop plugin", e);
+            }
+        }
+    }
+
+    @Override
+    public void onConfigurationChanged(Configuration newConfig) {
+        // Need to update plugin names as they might be localized
+        onChanged();
+    }
+
+    @Override
+    public void onChanged() {
+        ArrayList<RecommendationInfo> recommendations = new ArrayList<>();
+
+        final int numPlugins = mPlugins.size();
+        for (int i = 0; i < numPlugins; i++) {
+            RemotePrintServicePlugin plugin = mPlugins.get(i);
+
+            try {
+                int numPrinters = plugin.getNumPrinters();
+
+                if (numPrinters > 0) {
+                    recommendations.add(new RecommendationInfo(plugin.packageName,
+                            getString(plugin.name), numPrinters,
+                            plugin.recommendsMultiVendorService));
+                }
+            } catch (Exception e) {
+                Log.e(LOG_TAG, "Could not read state of plugin for " + plugin.packageName, e);
+            }
+        }
+
+        updateRecommendations(recommendations);
+    }
+}
diff --git a/packages/PrintRecommendationService/src/com/android/printservice/recommendation/RemotePrintServicePlugin.java b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/RemotePrintServicePlugin.java
new file mode 100644
index 000000000000..dbd164946dfb
--- /dev/null
+++ b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/RemotePrintServicePlugin.java
@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.printservice.recommendation;
+
+import android.annotation.IntRange;
+import android.annotation.NonNull;
+import android.annotation.StringRes;
+import com.android.internal.util.Preconditions;
+
+/**
+ * Wrapper for a {@link PrintServicePlugin}, isolating issues with the plugin as good as possible
+ * from the {@link RecommendationServiceImpl service}.
+ */
+class RemotePrintServicePlugin implements PrintServicePlugin.PrinterDiscoveryCallback {
+    /** Lock for this object */
+    private final Object mLock = new Object();
+
+    /** The name of the print service. */
+    public final @StringRes int name;
+
+    /** If the print service if for more than a single vendor */
+    public final boolean recommendsMultiVendorService;
+
+    /** The package name of the full print service */
+    public final @NonNull CharSequence packageName;
+
+    /** Wrapped plugin */
+    private final @NonNull PrintServicePlugin mPlugin;
+
+    /** The number of printers discovered by the plugin */
+    private @IntRange(from = 0) int mNumPrinters;
+
+    /** If the plugin is started by not yet stopped */
+    private boolean isRunning;
+
+    /** Listener for changes to {@link #mNumPrinters}. */
+    private @NonNull OnChangedListener mListener;
+
+    /**
+     * Create a new remote for a {@link PrintServicePlugin plugin}.
+     *
+     * @param plugin                       The plugin to be wrapped
+     * @param listener                     The listener to be notified about changes in this plugin
+     * @param recommendsMultiVendorService If the plugin detects printers of more than a single
+     *                                     vendor
+     *
+     * @throws PluginException If the plugin has issues while caching basic stub properties
+     */
+    public RemotePrintServicePlugin(@NonNull PrintServicePlugin plugin,
+            @NonNull OnChangedListener listener, boolean recommendsMultiVendorService)
+            throws PluginException {
+        mListener = listener;
+        mPlugin = plugin;
+        this.recommendsMultiVendorService = recommendsMultiVendorService;
+
+        // We handle any throwable to isolate our self from bugs in the plugin code.
+        // Cache simple properties to avoid having to deal with exceptions later in the code.
+        try {
+            name = Preconditions.checkArgumentPositive(mPlugin.getName(), "name");
+            packageName = Preconditions.checkStringNotEmpty(mPlugin.getPackageName(),
+                    "packageName");
+        } catch (Throwable e) {
+            throw new PluginException(mPlugin, "Cannot cache simple properties ", e);
+        }
+
+        isRunning = false;
+    }
+
+    /**
+     * Start the plugin. From now on there might be callbacks to the registered listener.
+     */
+    public void start()
+            throws PluginException {
+        // We handle any throwable to isolate our self from bugs in the stub code
+        try {
+            synchronized (mLock) {
+                isRunning = true;
+                mPlugin.start(this);
+            }
+        } catch (Throwable e) {
+            throw new PluginException(mPlugin, "Cannot start", e);
+        }
+    }
+
+    /**
+     * Stop the plugin. From this call on there will not be any more callbacks.
+     */
+    public void stop() throws PluginException {
+        // We handle any throwable to isolate our self from bugs in the stub code
+        try {
+            synchronized (mLock) {
+                mPlugin.stop();
+                isRunning = false;
+            }
+        } catch (Throwable e) {
+            throw new PluginException(mPlugin, "Cannot stop", e);
+        }
+    }
+
+    /**
+     * Get the current number of printers reported by the stub.
+     *
+     * @return The number of printers reported by the stub.
+     */
+    public @IntRange(from = 0) int getNumPrinters() {
+        return mNumPrinters;
+    }
+
+    @Override
+    public void onChanged(@IntRange(from = 0) int numDiscoveredPrinters) {
+        synchronized (mLock) {
+            Preconditions.checkState(isRunning);
+
+            mNumPrinters = Preconditions.checkArgumentNonnegative(numDiscoveredPrinters,
+                    "numDiscoveredPrinters");
+
+            if (mNumPrinters > 0) {
+                mListener.onChanged();
+            }
+        }
+    }
+
+    /**
+     * Listener to listen for changes to {@link #getNumPrinters}
+     */
+    public interface OnChangedListener {
+        void onChanged();
+    }
+
+    /**
+     * Exception thrown if the stub has any issues.
+     */
+    public class PluginException extends Exception {
+        private PluginException(PrintServicePlugin plugin, String message, Throwable e) {
+            super(plugin + ": " + message, e);
+        }
+    }
+}
diff --git a/packages/PrintRecommendationService/src/com/android/printservice/recommendation/plugin/mdnsFilter/MDNSFilterPlugin.java b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/plugin/mdnsFilter/MDNSFilterPlugin.java
new file mode 100644
index 000000000000..26300b1e37b9
--- /dev/null
+++ b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/plugin/mdnsFilter/MDNSFilterPlugin.java
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.printservice.recommendation.plugin.mdnsFilter;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.annotation.StringRes;
+import android.content.Context;
+import android.net.nsd.NsdManager;
+import android.net.nsd.NsdServiceInfo;
+import android.util.Log;
+import com.android.internal.annotations.GuardedBy;
+import com.android.internal.util.Preconditions;
+import com.android.printservice.recommendation.PrintServicePlugin;
+import com.android.printservice.recommendation.util.MDNSUtils;
+import com.android.printservice.recommendation.util.NsdResolveQueue;
+
+import java.util.HashSet;
+import java.util.List;
+
+/**
+ * A plugin listening for mDNS results and only adding the ones that {@link
+ * MDNSUtils#isVendorPrinter match} configured list
+ */
+public class MDNSFilterPlugin implements PrintServicePlugin, NsdManager.DiscoveryListener {
+    private static final String LOG_TAG = "MDNSFilterPlugin";
+
+    private static final String PRINTER_SERVICE_TYPE = "_ipp._tcp";
+
+    /** Name of the print service this plugin is for */
+    private final @StringRes int mName;
+
+    /** Package name of the print service this plugin is for */
+    private final @NonNull CharSequence mPackageName;
+
+    /** mDNS names handled by the print service this plugin is for */
+    private final @NonNull HashSet<String> mMDNSNames;
+
+    /** Printer identifiers of the mPrinters found. */
+    @GuardedBy("mLock")
+    private final @NonNull HashSet<String> mPrinters;
+
+    /** Context of the user of this plugin */
+    private final @NonNull Context mContext;
+
+    /**
+     * Call back to report the number of mPrinters found.
+     *
+     * We assume that {@link #start} and {@link #stop} are never called in parallel, hence it is
+     * safe to not synchronize access to this field.
+     */
+    private @Nullable PrinterDiscoveryCallback mCallback;
+
+    /** Queue used to resolve nsd infos */
+    private final @NonNull NsdResolveQueue mResolveQueue;
+
+    /**
+     * Create new stub that assumes that a print service can be used to print on all mPrinters
+     * matching some mDNS names.
+     *
+     * @param context     The context the plugin runs in
+     * @param name        The user friendly name of the print service
+     * @param packageName The package name of the print service
+     * @param mDNSNames   The mDNS names of the printer.
+     */
+    public MDNSFilterPlugin(@NonNull Context context, @NonNull String name,
+            @NonNull CharSequence packageName, @NonNull List<String> mDNSNames) {
+        mContext = Preconditions.checkNotNull(context, "context");
+        mName = mContext.getResources().getIdentifier(Preconditions.checkStringNotEmpty(name,
+                "name"), null, mContext.getPackageName());
+        mPackageName = Preconditions.checkStringNotEmpty(packageName);
+        mMDNSNames = new HashSet<>(Preconditions
+                .checkCollectionNotEmpty(Preconditions.checkCollectionElementsNotNull(mDNSNames,
+                        "mDNSNames"), "mDNSNames"));
+
+        mResolveQueue = NsdResolveQueue.getInstance();
+        mPrinters = new HashSet<>();
+    }
+
+    @Override
+    public @NonNull CharSequence getPackageName() {
+        return mPackageName;
+    }
+
+    /**
+     * @return The NDS manager
+     */
+    private NsdManager getNDSManager() {
+        return (NsdManager) mContext.getSystemService(Context.NSD_SERVICE);
+    }
+
+    @Override
+    public void start(@NonNull PrinterDiscoveryCallback callback) throws Exception {
+        mCallback = callback;
+
+        getNDSManager().discoverServices(PRINTER_SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD,
+                this);
+    }
+
+    @Override
+    public @StringRes int getName() {
+        return mName;
+    }
+
+    @Override
+    public void stop() throws Exception {
+        mCallback.onChanged(0);
+        mCallback = null;
+
+        getNDSManager().stopServiceDiscovery(this);
+    }
+
+    @Override
+    public void onStartDiscoveryFailed(String serviceType, int errorCode) {
+        Log.w(LOG_TAG, "Failed to start network discovery for type " + serviceType + ": "
+                + errorCode);
+    }
+
+    @Override
+    public void onStopDiscoveryFailed(String serviceType, int errorCode) {
+        Log.w(LOG_TAG, "Failed to stop network discovery for type " + serviceType + ": "
+                + errorCode);
+    }
+
+    @Override
+    public void onDiscoveryStarted(String serviceType) {
+        // empty
+    }
+
+    @Override
+    public void onDiscoveryStopped(String serviceType) {
+        mPrinters.clear();
+    }
+
+    @Override
+    public void onServiceFound(NsdServiceInfo serviceInfo) {
+        mResolveQueue.resolve(getNDSManager(), serviceInfo,
+                new NsdManager.ResolveListener() {
+            @Override
+            public void onResolveFailed(NsdServiceInfo serviceInfo, int errorCode) {
+                Log.w(LOG_TAG, "Service found: could not resolve " + serviceInfo + ": " +
+                        errorCode);
+            }
+
+            @Override
+            public void onServiceResolved(NsdServiceInfo serviceInfo) {
+                if (MDNSUtils.isVendorPrinter(serviceInfo, mMDNSNames)) {
+                    if (mCallback != null) {
+                        boolean added = mPrinters.add(serviceInfo.getHost().getHostAddress());
+
+                        if (added) {
+                            mCallback.onChanged(mPrinters.size());
+                        }
+                    }
+                }
+            }
+        });
+    }
+
+    @Override
+    public void onServiceLost(NsdServiceInfo serviceInfo) {
+        mResolveQueue.resolve(getNDSManager(), serviceInfo,
+                new NsdManager.ResolveListener() {
+            @Override
+            public void onResolveFailed(NsdServiceInfo serviceInfo, int errorCode) {
+                Log.w(LOG_TAG, "Service lost: Could not resolve " + serviceInfo + ": "
+                        + errorCode);
+            }
+
+            @Override
+            public void onServiceResolved(NsdServiceInfo serviceInfo) {
+                if (MDNSUtils.isVendorPrinter(serviceInfo, mMDNSNames)) {
+                    if (mCallback != null) {
+                        boolean removed = mPrinters
+                                .remove(serviceInfo.getHost().getHostAddress());
+
+                        if (removed) {
+                            mCallback.onChanged(mPrinters.size());
+                        }
+                    }
+                }
+            }
+        });
+    }
+}
diff --git a/packages/PrintRecommendationService/src/com/android/printservice/recommendation/plugin/mdnsFilter/VendorConfig.java b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/plugin/mdnsFilter/VendorConfig.java
new file mode 100644
index 000000000000..57d5c710f6bd
--- /dev/null
+++ b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/plugin/mdnsFilter/VendorConfig.java
@@ -0,0 +1,325 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.printservice.recommendation.plugin.mdnsFilter;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.content.Context;
+import android.content.res.XmlResourceParser;
+import android.util.ArrayMap;
+import com.android.internal.annotations.Immutable;
+import com.android.internal.util.Preconditions;
+import com.android.printservice.recommendation.R;
+import org.xmlpull.v1.XmlPullParser;
+import org.xmlpull.v1.XmlPullParserException;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Vendor configuration as read from {@link R.xml#vendorconfigs vendorconfigs.xml}. Configuration
+ * can be read via {@link #getConfig(Context, String)}.
+ */
+@Immutable
+public class VendorConfig {
+    /** Lock for {@link #sConfigs} */
+    private static final Object sLock = new Object();
+
+    /** Strings used as XML tags */
+    private static final String VENDORS_TAG = "vendors";
+    private static final String VENDOR_TAG = "vendor";
+    private static final String NAME_TAG = "name";
+    private static final String PACKAGE_TAG = "package";
+    private static final String MDNSNAMES_TAG = "mdns-names";
+    private static final String MDNSNAME_TAG = "mdns-name";
+
+    /** Map from vendor name to config. Initialized on first {@link #getConfig use}. */
+    private static @Nullable ArrayMap<String, VendorConfig> sConfigs;
+
+    /** Localized vendor name */
+    public final @NonNull String name;
+
+    /** Package name containing the print service for this vendor */
+    public final @NonNull String packageName;
+
+    /** mDNS names used by this vendor */
+    public final @NonNull List<String> mDNSNames;
+
+    /**
+     * Create an immutable configuration.
+     */
+    private VendorConfig(@NonNull String name, @NonNull String packageName,
+            @NonNull List<String> mDNSNames) {
+        this.name = Preconditions.checkStringNotEmpty(name);
+        this.packageName = Preconditions.checkStringNotEmpty(packageName);
+        this.mDNSNames = Preconditions.checkCollectionElementsNotNull(mDNSNames, "mDNSName");
+    }
+
+    /**
+     * Get the configuration for a vendor.
+     *
+     * @param context Calling context
+     * @param name    The name of the config to read
+     *
+     * @return the config for the vendor or null if not found
+     *
+     * @throws IOException
+     * @throws XmlPullParserException
+     */
+    public static @Nullable VendorConfig getConfig(@NonNull Context context, @NonNull String name)
+            throws IOException, XmlPullParserException {
+        synchronized (sLock) {
+            if (sConfigs == null) {
+                sConfigs = readVendorConfigs(context);
+            }
+
+            return sConfigs.get(name);
+        }
+    }
+
+    /**
+     * Get all known vendor configurations.
+     *
+     * @param context Calling context
+     *
+     * @return The known configurations
+     *
+     * @throws IOException
+     * @throws XmlPullParserException
+     */
+    public static @NonNull Collection<VendorConfig> getAllConfigs(@NonNull Context context)
+            throws IOException, XmlPullParserException {
+        synchronized (sLock) {
+            if (sConfigs == null) {
+                sConfigs = readVendorConfigs(context);
+            }
+
+            return sConfigs.values();
+        }
+    }
+
+    /**
+     * Read the text from a XML tag.
+     *
+     * @param parser XML parser to read from
+     *
+     * @return The text or "" if no text was found
+     *
+     * @throws IOException
+     * @throws XmlPullParserException
+     */
+    private static @NonNull String readText(XmlPullParser parser)
+            throws IOException, XmlPullParserException {
+        String result = "";
+
+        if (parser.next() == XmlPullParser.TEXT) {
+            result = parser.getText();
+            parser.nextTag();
+        }
+
+        return result;
+    }
+
+    /**
+     * Read a tag with a text content from the parser.
+     *
+     * @param parser  XML parser to read from
+     * @param tagName The name of the tag to read
+     *
+     * @return The text content of the tag
+     *
+     * @throws IOException
+     * @throws XmlPullParserException
+     */
+    private static @NonNull String readSimpleTag(@NonNull Context context,
+            @NonNull XmlPullParser parser, @NonNull String tagName, boolean resolveReferences)
+            throws IOException, XmlPullParserException {
+        parser.require(XmlPullParser.START_TAG, null, tagName);
+        String text = readText(parser);
+        parser.require(XmlPullParser.END_TAG, null, tagName);
+
+        if (resolveReferences && text.startsWith("@")) {
+            return context.getResources().getString(
+                    context.getResources().getIdentifier(text, null, context.getPackageName()));
+        } else {
+            return text;
+        }
+    }
+
+    /**
+     * Read content of a list of tags.
+     *
+     * @param parser     XML parser to read from
+     * @param tagName    The name of the list tag
+     * @param subTagName The name of the list-element tags
+     * @param tagReader  The {@link TagReader reader} to use to read the tag content
+     * @param <T>        The type of the parsed tag content
+     *
+     * @return A list of {@link T}
+     *
+     * @throws XmlPullParserException
+     * @throws IOException
+     */
+    private static @NonNull <T> ArrayList<T> readTagList(@NonNull XmlPullParser parser,
+            @NonNull String tagName, @NonNull String subTagName, @NonNull TagReader<T> tagReader)
+            throws XmlPullParserException, IOException {
+        ArrayList<T> entries = new ArrayList<>();
+
+        parser.require(XmlPullParser.START_TAG, null, tagName);
+        while (parser.next() != XmlPullParser.END_TAG) {
+            if (parser.getEventType() != XmlPullParser.START_TAG) {
+                continue;
+            }
+
+            if (parser.getName().equals(subTagName)) {
+                entries.add(tagReader.readTag(parser, subTagName));
+            } else {
+                throw new XmlPullParserException(
+                        "Unexpected subtag of " + tagName + ": " + parser.getName());
+            }
+        }
+
+        return entries;
+    }
+
+    /**
+     * Read the vendor configuration file.
+     *
+     * @param context The content issuing the read
+     *
+     * @return An map pointing from vendor name to config
+     *
+     * @throws IOException
+     * @throws XmlPullParserException
+     */
+    private static @NonNull ArrayMap<String, VendorConfig> readVendorConfigs(
+            @NonNull final Context context) throws IOException, XmlPullParserException {
+        try (XmlResourceParser parser = context.getResources().getXml(R.xml.vendorconfigs)) {
+            // Skip header
+            int parsingEvent;
+            do {
+                parsingEvent = parser.next();
+            } while (parsingEvent != XmlResourceParser.START_TAG);
+
+            ArrayList<VendorConfig> configs = readTagList(parser, VENDORS_TAG, VENDOR_TAG,
+                    new TagReader<VendorConfig>() {
+                        public VendorConfig readTag(XmlPullParser parser, String tagName)
+                                throws XmlPullParserException, IOException {
+                            return readVendorConfig(context, parser, tagName);
+                        }
+                    });
+
+            ArrayMap<String, VendorConfig> configMap = new ArrayMap<>(configs.size());
+            final int numConfigs = configs.size();
+            for (int i = 0; i < numConfigs; i++) {
+                VendorConfig config = configs.get(i);
+
+                configMap.put(config.name, config);
+            }
+
+            return configMap;
+        }
+    }
+
+    /**
+     * Read a single vendor configuration.
+     *
+     * @param parser  XML parser to read from
+     * @param tagName The vendor tag
+     * @param context Calling context
+     *
+     * @return A config
+     *
+     * @throws XmlPullParserException
+     * @throws IOException
+     */
+    private static VendorConfig readVendorConfig(@NonNull final Context context,
+            @NonNull XmlPullParser parser, @NonNull String tagName) throws XmlPullParserException,
+            IOException {
+        parser.require(XmlPullParser.START_TAG, null, tagName);
+
+        String name = null;
+        String packageName = null;
+        List<String> mDNSNames = null;
+
+        while (parser.next() != XmlPullParser.END_TAG) {
+            if (parser.getEventType() != XmlPullParser.START_TAG) {
+                continue;
+            }
+
+            String subTagName = parser.getName();
+
+            switch (subTagName) {
+                case NAME_TAG:
+                    name = readSimpleTag(context, parser, NAME_TAG, false);
+                    break;
+                case PACKAGE_TAG:
+                    packageName = readSimpleTag(context, parser, PACKAGE_TAG, true);
+                    break;
+                case MDNSNAMES_TAG:
+                    mDNSNames = readTagList(parser, MDNSNAMES_TAG, MDNSNAME_TAG,
+                            new TagReader<String>() {
+                                public String readTag(XmlPullParser parser, String tagName)
+                                        throws XmlPullParserException, IOException {
+                                    return readSimpleTag(context, parser, tagName, true);
+                                }
+                            }
+                    );
+                    break;
+                default:
+                    throw new XmlPullParserException("Unexpected subtag of " + tagName + ": "
+                            + subTagName);
+
+            }
+        }
+
+        if (name == null) {
+            throw new XmlPullParserException("name is required");
+        }
+
+        if (packageName == null) {
+            throw new XmlPullParserException("package is required");
+        }
+
+        if (mDNSNames == null) {
+            mDNSNames = Collections.emptyList();
+        }
+
+        // A vendor config should be immutable
+        mDNSNames = Collections.unmodifiableList(mDNSNames);
+
+        return new VendorConfig(name, packageName, mDNSNames);
+    }
+
+    @Override
+    public String toString() {
+        return name + " -> " + packageName + ", " + mDNSNames;
+    }
+
+    /**
+     * Used a a "function pointer" when reading a tag in {@link #readTagList(XmlPullParser, String,
+     * String, TagReader)}.
+     *
+     * @param <T> The type of content to read
+     */
+    private interface TagReader<T> {
+        T readTag(XmlPullParser parser, String tagName) throws XmlPullParserException, IOException;
+    }
+}
diff --git a/packages/PrintRecommendationService/src/com/android/printservice/recommendation/util/MDNSUtils.java b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/util/MDNSUtils.java
new file mode 100644
index 000000000000..0541c3565dba
--- /dev/null
+++ b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/util/MDNSUtils.java
@@ -0,0 +1,98 @@
+/*
+ * (c) Copyright 2016 Mopria Alliance, Inc.
+ * (c) Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.printservice.recommendation.util;
+
+import android.annotation.NonNull;
+import android.net.nsd.NsdServiceInfo;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Utils for dealing with mDNS attributes
+ */
+public class MDNSUtils {
+    public static final String ATTRIBUTE_TY = "ty";
+    public static final String ATTRIBUTE_PRODUCT = "product";
+    public static final String ATTRIBUTE_USB_MFG = "usb_mfg";
+    public static final String ATTRIBUTE_MFG = "mfg";
+
+    /**
+     * Check if the service has any of a set of vendor names.
+     *
+     * @param serviceInfo The service
+     * @param vendorNames The vendors
+     *
+     * @return true iff the has any of the set of vendor names
+     */
+    public static boolean isVendorPrinter(@NonNull NsdServiceInfo serviceInfo,
+            @NonNull Set<String> vendorNames) {
+        for (Map.Entry<String, byte[]> entry : serviceInfo.getAttributes().entrySet()) {
+            // keys are case insensitive
+            String key = entry.getKey().toLowerCase();
+
+            switch (key) {
+                case ATTRIBUTE_TY:
+                case ATTRIBUTE_PRODUCT:
+                case ATTRIBUTE_USB_MFG:
+                case ATTRIBUTE_MFG:
+                    if (entry.getValue() != null) {
+                        if (containsVendor(new String(entry.getValue(), StandardCharsets.UTF_8),
+                                vendorNames)) {
+                            return true;
+                        }
+                    }
+                    break;
+                default:
+                    break;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Check if the attribute matches any of the vendor names, ignoring capitalization.
+     *
+     * @param attr        The attribute
+     * @param vendorNames The vendor names
+     *
+     * @return true iff the attribute matches any of the vendor names
+     */
+    private static boolean containsVendor(@NonNull String attr, @NonNull Set<String> vendorNames) {
+        for (String name : vendorNames) {
+            if (containsString(attr.toLowerCase(), name.toLowerCase())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Check if a string in another string.
+     *
+     * @param container The string that contains the string
+     * @param contained The string that is contained
+     *
+     * @return true if the string is contained in the other
+     */
+    private static boolean containsString(@NonNull String container, @NonNull String contained) {
+        return container.equalsIgnoreCase(contained) || container.contains(contained + " ");
+    }
+}
diff --git a/packages/PrintRecommendationService/src/com/android/printservice/recommendation/util/NsdResolveQueue.java b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/util/NsdResolveQueue.java
new file mode 100644
index 000000000000..fad50f6a404b
--- /dev/null
+++ b/packages/PrintRecommendationService/src/com/android/printservice/recommendation/util/NsdResolveQueue.java
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.printservice.recommendation.util;
+
+import android.annotation.NonNull;
+import android.net.nsd.NsdManager;
+import android.net.nsd.NsdServiceInfo;
+import com.android.internal.annotations.GuardedBy;
+
+import java.util.LinkedList;
+
+/**
+ * Nsd resolve requests for the same info cancel each other. Hence this class synchronizes the
+ * resolutions to hide this effect.
+ */
+public class NsdResolveQueue {
+    /** Lock for {@link #sInstance} */
+    private static final Object sLock = new Object();
+
+    /** Instance of this singleton */
+    @GuardedBy("sLock")
+    private static NsdResolveQueue sInstance;
+
+    /** Lock for {@link #mResolveRequests} */
+    private final Object mLock = new Object();
+
+    /** Current set of registered service info resolve attempts */
+    @GuardedBy("mLock")
+    private final LinkedList<NsdResolveRequest> mResolveRequests = new LinkedList<>();
+
+    public static NsdResolveQueue getInstance() {
+        synchronized (sLock) {
+            if (sInstance == null) {
+                sInstance = new NsdResolveQueue();
+            }
+
+            return sInstance;
+        }
+    }
+
+    /**
+     * Container for a request to resolve a serviceInfo.
+     */
+    private static class NsdResolveRequest {
+        final @NonNull NsdManager nsdManager;
+        final @NonNull NsdServiceInfo serviceInfo;
+        final @NonNull NsdManager.ResolveListener listener;
+
+        private NsdResolveRequest(@NonNull NsdManager nsdManager,
+                @NonNull NsdServiceInfo serviceInfo, @NonNull NsdManager.ResolveListener listener) {
+            this.nsdManager = nsdManager;
+            this.serviceInfo = serviceInfo;
+            this.listener = listener;
+        }
+    }
+
+    /**
+     * Resolve a serviceInfo or queue the request if there is a request currently in flight.
+     *
+     * @param nsdManager  The nsd manager to use
+     * @param serviceInfo The service info to resolve
+     * @param listener    The listener to call back once the info is resolved.
+     */
+    public void resolve(@NonNull NsdManager nsdManager, @NonNull NsdServiceInfo serviceInfo,
+            @NonNull NsdManager.ResolveListener listener) {
+        synchronized (mLock) {
+            mResolveRequests.addLast(new NsdResolveRequest(nsdManager, serviceInfo,
+                    new ListenerWrapper(listener)));
+
+            if (mResolveRequests.size() == 1) {
+                resolveNextRequest();
+            }
+        }
+    }
+
+    /**
+     * Wrapper for a {@link NsdManager.ResolveListener}. Calls the listener and then
+     * {@link #resolveNextRequest()}.
+     */
+    private class ListenerWrapper implements NsdManager.ResolveListener {
+        private final @NonNull NsdManager.ResolveListener mListener;
+
+        private ListenerWrapper(@NonNull NsdManager.ResolveListener listener) {
+            mListener = listener;
+        }
+
+        @Override
+        public void onResolveFailed(NsdServiceInfo serviceInfo, int errorCode) {
+            mListener.onResolveFailed(serviceInfo, errorCode);
+
+            synchronized (mLock) {
+                mResolveRequests.pop();
+                resolveNextRequest();
+            }
+        }
+
+        @Override
+        public void onServiceResolved(NsdServiceInfo serviceInfo) {
+            mListener.onServiceResolved(serviceInfo);
+
+            synchronized (mLock) {
+                mResolveRequests.pop();
+                resolveNextRequest();
+            }
+        }
+    }
+
+    /**
+     * Resolve the next request if there is one.
+     */
+    private void resolveNextRequest() {
+        if (!mResolveRequests.isEmpty()) {
+            NsdResolveRequest request = mResolveRequests.getFirst();
+
+            request.nsdManager.resolveService(request.serviceInfo, request.listener);
+        }
+    }
+
+}