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/*
* Copyright 2017 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.hardware.location;
import android.annotation.Nullable;
import android.annotation.SystemApi;
import android.os.Parcel;
import android.os.Parcelable;
import java.util.Arrays;
/**
* A class describing messages send to or from nanoapps through the Context Hub Service.
*
* The basis of the class is in the IContextHub.hal ContextHubMsg definition.
*
* @hide
*/
@SystemApi
public final class NanoAppMessage implements Parcelable {
private static final int DEBUG_LOG_NUM_BYTES = 16;
private long mNanoAppId;
private int mMessageType;
private byte[] mMessageBody;
private boolean mIsBroadcasted;
private NanoAppMessage(
long nanoAppId, int messageType, byte[] messageBody, boolean broadcasted) {
mNanoAppId = nanoAppId;
mMessageType = messageType;
mMessageBody = messageBody;
mIsBroadcasted = broadcasted;
}
/**
* Creates a NanoAppMessage object to send to a nanoapp.
*
* This factory method can be used to generate a NanoAppMessage object to be used in
* the ContextHubClient.sendMessageToNanoApp API.
*
* @param targetNanoAppId the ID of the nanoapp to send the message to
* @param messageType the nanoapp-dependent message type
* @param messageBody the byte array message contents
*
* @return the NanoAppMessage object
*/
public static NanoAppMessage createMessageToNanoApp(
long targetNanoAppId, int messageType, byte[] messageBody) {
return new NanoAppMessage(
targetNanoAppId, messageType, messageBody, false /* broadcasted */);
}
/**
* Creates a NanoAppMessage object sent from a nanoapp.
*
* This factory method is intended only to be used by the Context Hub Service when delivering
* messages from a nanoapp to clients.
*
* @param sourceNanoAppId the ID of the nanoapp that the message was sent from
* @param messageType the nanoapp-dependent message type
* @param messageBody the byte array message contents
* @param broadcasted {@code true} if the message was broadcasted, {@code false} otherwise
*
* @return the NanoAppMessage object
*/
public static NanoAppMessage createMessageFromNanoApp(
long sourceNanoAppId, int messageType, byte[] messageBody, boolean broadcasted) {
return new NanoAppMessage(sourceNanoAppId, messageType, messageBody, broadcasted);
}
/**
* @return the ID of the source or destination nanoapp
*/
public long getNanoAppId() {
return mNanoAppId;
}
/**
* @return the type of the message that is nanoapp-dependent
*/
public int getMessageType() {
return mMessageType;
}
/**
* @return the byte array contents of the message
*/
public byte[] getMessageBody() {
return mMessageBody;
}
/**
* @return {@code true} if the message is broadcasted, {@code false} otherwise
*/
public boolean isBroadcastMessage() {
return mIsBroadcasted;
}
private NanoAppMessage(Parcel in) {
mNanoAppId = in.readLong();
mIsBroadcasted = (in.readInt() == 1);
mMessageType = in.readInt();
int msgSize = in.readInt();
mMessageBody = new byte[msgSize];
in.readByteArray(mMessageBody);
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel out, int flags) {
out.writeLong(mNanoAppId);
out.writeInt(mIsBroadcasted ? 1 : 0);
out.writeInt(mMessageType);
out.writeInt(mMessageBody.length);
out.writeByteArray(mMessageBody);
}
public static final @android.annotation.NonNull Creator<NanoAppMessage> CREATOR =
new Creator<NanoAppMessage>() {
@Override
public NanoAppMessage createFromParcel(Parcel in) {
return new NanoAppMessage(in);
}
@Override
public NanoAppMessage[] newArray(int size) {
return new NanoAppMessage[size];
}
};
@Override
public String toString() {
int length = mMessageBody.length;
String ret = "NanoAppMessage[type = " + mMessageType + ", length = " + mMessageBody.length
+ " bytes, " + (mIsBroadcasted ? "broadcast" : "unicast") + ", nanoapp = 0x"
+ Long.toHexString(mNanoAppId) + "](";
if (length > 0) {
ret += "data = 0x";
}
for (int i = 0; i < Math.min(length, DEBUG_LOG_NUM_BYTES); i++) {
ret += Byte.toHexString(mMessageBody[i], true /* upperCase */);
if ((i + 1) % 4 == 0) {
ret += " ";
}
}
if (length > DEBUG_LOG_NUM_BYTES) {
ret += "...";
}
ret += ")";
return ret;
}
@Override
public boolean equals(@Nullable Object object) {
if (object == this) {
return true;
}
boolean isEqual = false;
if (object instanceof NanoAppMessage) {
NanoAppMessage other = (NanoAppMessage) object;
isEqual = (other.getNanoAppId() == mNanoAppId)
&& (other.getMessageType() == mMessageType)
&& (other.isBroadcastMessage() == mIsBroadcasted)
&& Arrays.equals(other.getMessageBody(), mMessageBody);
}
return isEqual;
}
}
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