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/*
* Copyright (C) 2010 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.
*/
/**
* File : P2PTarget.java
* Original-Author : Trusted Logic S.A. (Daniel Tomas)
*/
package com.trustedlogic.trustednfc.android;
import java.io.IOException;
import com.trustedlogic.trustednfc.android.internal.ErrorCodes;
import android.os.RemoteException;
import android.util.Log;
/**
* P2pTarget represents the target in an NFC-IP1 peer-to-peer communication.
*
* @see P2pInitiator
* @since AA02.01
* @hide
*/
public class P2pTarget extends P2pDevice {
private static final String TAG = "P2pTarget";
/**
* The entry point for P2P tag operations.
* @hide
*/
private IP2pTarget mService;
/**
* Flag set when the object is closed and thus not usable any more.
* @hide
*/
private boolean isClosed = false;
/**
* Flag set when the tag is connected.
* @hide
*/
private boolean isConnected = false;
/**
* Check if tag is still opened.
*
* @return data sent by the P2pInitiator.
* @throws NfcException if accessing a closed target.
*
* @hide
*/
public void checkState() throws NfcException {
if(isClosed) {
throw new NfcException("Tag has been closed.");
}
}
/**
* Internal constructor for the P2pTarget class.
*
* @param handle The handle returned by the NFC service and used to identify
* the tag in subsequent calls.
*
* @hide
*/
P2pTarget(IP2pTarget service, int handle) {
this.mService = service;
this.mHandle = handle;
}
/**
* Connects to the P2pTarget. This shall be called prior to any other
* operation on the P2pTarget.
*
* @throws NfcException
*/
public void connect() throws NfcException {
// Check state
checkState();
if (isConnected) {
throw new NfcException("Already connected");
}
// Perform connect
try {
int result = mService.connect(mHandle);
if (ErrorCodes.isError(result)) {
if (result == ErrorCodes.ERROR_IO) {
throw new NfcException("Failed to connect");
}
else {
throw NfcManager.convertErrorToNfcException(result);
}
}
isConnected = true;
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in connect(): ", e);
}
}
/**
* Disconnects from the P2p Target. This must be called so that other
* targets can be discovered. It restarts the NFC discovery loop.
*
* @throws NFCException
*/
public void disconnect() throws NfcException {
checkState();
try {
mService.disconnect(mHandle);
isConnected = true;
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in disconnect(): ", e);
}
}
/**
* Exchanges raw data with the P2pTarget.
*
* @param data data to be sent to the P2pTarget
* @return data sent in response by the P2pTarget
* @throws IOException if the target has been lost or the connection has
* been closed.
* @throws NfcException in case of failure within the stack
*/
public byte[] transceive(byte[] data) throws IOException, NfcException {
// Check state
checkState();
// Perform transceive
try {
byte[] response = mService.transceive(mHandle, data);
if (response == null) {
throw new IOException("Transceive failed");
}
return response;
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in transceive(): ", e);
return null;
}
}
/**
* Get the General bytes of the connected P2P Target
*
* @return general bytes of the connected P2P Target
* @throws IOException if the target in not in connected state
*/
public byte[] getGeneralBytes() throws IOException {
try {
if(isConnected){
return mService.getGeneralBytes(mHandle);
}else{
throw new IOException("Target not in connected state");
}
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in getGeneralBytes(): ", e);
return null;
}
}
@Override
public int getMode() {
return P2pDevice.MODE_P2P_TARGET;
}
}
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