Codegen for parcelable/dataclass boilerplate

This is the initial implementation of the `codegen` cli utility
for in-place java boilerplate generation

See DataClass and SampleDataClass for documentation/guide/examples.

See tools/codegen/ for implementation and tests/Codegen/ for tests.

Bug: 64221737
Test: . frameworks/base/tests/Codegen/runTest.sh
Change-Id: I75177cb770f1beabc87dbae9e77ce4b93ca08e7f

1 files changed, 51 insertions, 0 deletions

diff --git a/tests/Codegen/src/com/android/codegentest/DateParcelling.java b/tests/Codegen/src/com/android/codegentest/DateParcelling.java
new file mode 100644
index 000000000000..b0b00d032553
--- /dev/null
+++ b/tests/Codegen/src/com/android/codegentest/DateParcelling.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2019 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.codegentest;
+
+import android.os.Parcel;
+
+import com.android.internal.util.Parcelling;
+
+import java.util.Date;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * Sample {@link Parcelling} implementation for {@link Date}.
+ *
+ * See {@link SampleDataClass#mDate} for usage.
+ * See {@link SampleDataClass#writeToParcel} + {@link SampleDataClass#sParcellingForDate}
+ * for resulting generated code.
+ *
+ * Ignore {@link #sInstanceCount} - used for testing.
+ */
+public class DateParcelling implements Parcelling<Date> {
+
+    static AtomicInteger sInstanceCount = new AtomicInteger(0);
+
+    public DateParcelling() {
+        sInstanceCount.getAndIncrement();
+    }
+
+    @Override
+    public void parcel(Date item, Parcel dest, int parcelFlags) {
+        dest.writeLong(item.getTime());
+    }
+
+    @Override
+    public Date unparcel(Parcel source) {
+        return new Date(source.readLong());
+    }
+}