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/*
* Copyright (C) 2014 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 android.bluetooth.le;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.Log;
import java.nio.BufferOverflowException;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* Wrapper for Transport Discovery Data AD Type.
* This class contains the Transport Discovery Data AD Type Code as well as
* a list of potential Transport Blocks.
*
* @see AdvertiseData
*/
public final class TransportDiscoveryData implements Parcelable {
private static final String TAG = "TransportDiscoveryData";
private final int mTransportDataType;
private final List<TransportBlock> mTransportBlocks;
/**
* Creates a TransportDiscoveryData instance.
*
* @param transportDataType the Transport Discovery Data AD Type
* @param transportBlocks the list of Transport Blocks
*/
public TransportDiscoveryData(int transportDataType,
@NonNull List<TransportBlock> transportBlocks) {
mTransportDataType = transportDataType;
mTransportBlocks = transportBlocks;
}
/**
* Creates a TransportDiscoveryData instance from byte arrays.
*
* Uses the transport discovery data bytes and parses them into an usable class.
*
* @param transportDiscoveryData the raw discovery data
*/
public TransportDiscoveryData(@NonNull byte[] transportDiscoveryData) {
ByteBuffer byteBuffer = ByteBuffer.wrap(transportDiscoveryData);
mTransportBlocks = new ArrayList();
if (byteBuffer.remaining() > 0) {
mTransportDataType = byteBuffer.get();
} else {
mTransportDataType = -1;
}
try {
while (byteBuffer.remaining() > 0) {
int orgId = byteBuffer.get();
int tdsFlags = byteBuffer.get();
int transportDataLength = byteBuffer.get();
byte[] transportData = new byte[transportDataLength];
byteBuffer.get(transportData, 0, transportDataLength);
mTransportBlocks.add(new TransportBlock(orgId, tdsFlags,
transportDataLength, transportData));
}
} catch (BufferUnderflowException e) {
Log.e(TAG, "Error while parsing data: " + e.toString());
}
}
private TransportDiscoveryData(Parcel in) {
mTransportDataType = in.readInt();
mTransportBlocks = in.createTypedArrayList(TransportBlock.CREATOR);
}
/**
* @hide
*/
@Override
public int describeContents() {
return 0;
}
/**
* @hide
*/
@Override
public boolean equals(@Nullable Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
TransportDiscoveryData other = (TransportDiscoveryData) obj;
return Arrays.equals(toByteArray(), other.toByteArray());
}
@Override
public void writeToParcel(@NonNull Parcel dest, int flags) {
dest.writeInt(mTransportDataType);
dest.writeTypedList(mTransportBlocks);
}
public static final @NonNull Creator<TransportDiscoveryData> CREATOR =
new Creator<TransportDiscoveryData>() {
@Override
public TransportDiscoveryData createFromParcel(Parcel in) {
return new TransportDiscoveryData(in);
}
@Override
public TransportDiscoveryData[] newArray(int size) {
return new TransportDiscoveryData[size];
}
};
/**
* Gets the transport data type.
*/
public int getTransportDataType() {
return mTransportDataType;
}
/**
* @return the list of {@link TransportBlock} in this TransportDiscoveryData
* or an empty list if there are no Transport Blocks
*/
@NonNull
public List<TransportBlock> getTransportBlocks() {
if (mTransportBlocks == null) {
return Collections.emptyList();
}
return mTransportBlocks;
}
/**
* Converts this TransportDiscoveryData to byte array
*
* @return byte array representation of this Transport Discovery Data or null if the
* conversion failed
*/
@Nullable
public byte[] toByteArray() {
try {
ByteBuffer buffer = ByteBuffer.allocate(totalBytes());
buffer.put((byte) mTransportDataType);
for (TransportBlock transportBlock : getTransportBlocks()) {
buffer.put(transportBlock.toByteArray());
}
return buffer.array();
} catch (BufferOverflowException e) {
Log.e(TAG, "Error converting to byte array: " + e.toString());
return null;
}
}
/**
* @return total byte count of this TransportDataDiscovery
*/
public int totalBytes() {
int size = 1; // Counting Transport Data Type here.
for (TransportBlock transportBlock : getTransportBlocks()) {
size += transportBlock.totalBytes();
}
return size;
}
}
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