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/*
* Copyright (C) 2011 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.nfc.snep;
import com.android.nfc.DeviceHost.LlcpSocket;
import com.android.nfc.LlcpException;
import com.android.nfc.NfcService;
import android.nfc.NdefMessage;
import android.util.Log;
import java.io.IOException;
public final class SnepClient {
private static final String TAG = "SnepClient";
private static final boolean DBG = false;
private static final int DEFAULT_ACCEPTABLE_LENGTH = 100*1024;
private static final int MIU = 128;
SnepMessenger mMessenger = null;
private final Object mTransmissionLock = new Object();
private final String mServiceName;
private final int mPort;
private int mState = DISCONNECTED;
private final int mAcceptableLength;
private final int mFragmentLength;
private static final int DISCONNECTED = 0;
private static final int CONNECTING = 1;
private static final int CONNECTED = 2;
public SnepClient() {
mServiceName = SnepServer.DEFAULT_SERVICE_NAME;
mPort = SnepServer.DEFAULT_PORT;
mAcceptableLength = DEFAULT_ACCEPTABLE_LENGTH;
mFragmentLength = -1;
}
public SnepClient(String serviceName) {
mServiceName = serviceName;
mPort = -1;
mAcceptableLength = DEFAULT_ACCEPTABLE_LENGTH;
mFragmentLength = -1;
}
SnepClient(String serviceName, int fragmentLength) {
mServiceName = serviceName;
mPort = -1;
mAcceptableLength = DEFAULT_ACCEPTABLE_LENGTH;
mFragmentLength = fragmentLength;
}
SnepClient(String serviceName, int acceptableLength, int fragmentLength) {
mServiceName = serviceName;
mPort = -1;
mAcceptableLength = acceptableLength;
mFragmentLength = fragmentLength;
}
public void put(NdefMessage msg) throws IOException {
SnepMessenger messenger;
synchronized (this) {
if (mState != CONNECTED) {
throw new IOException("Socket not connected.");
}
messenger = mMessenger;
}
synchronized (mTransmissionLock) {
try {
messenger.sendMessage(SnepMessage.getPutRequest(msg));
messenger.getMessage();
} catch (SnepException e) {
throw new IOException(e);
}
}
}
public SnepMessage get(NdefMessage msg) throws IOException {
SnepMessenger messenger;
synchronized (this) {
if (mState != CONNECTED) {
throw new IOException("Socket not connected.");
}
messenger = mMessenger;
}
synchronized (mTransmissionLock) {
try {
messenger.sendMessage(SnepMessage.getGetRequest(mAcceptableLength, msg));
return messenger.getMessage();
} catch (SnepException e) {
throw new IOException(e);
}
}
}
public void connect() throws IOException {
synchronized (this) {
if (mState != DISCONNECTED) {
throw new IOException("Socket already in use.");
}
mState = CONNECTING;
}
LlcpSocket socket = null;
SnepMessenger messenger;
try {
if (DBG) Log.d(TAG, "about to create socket");
// Connect to the snep server on the remote side
socket = NfcService.getInstance().createLlcpSocket(0, MIU, 1, 1024);
if (socket == null) {
throw new IOException("Could not connect to socket.");
}
if (mPort == -1) {
if (DBG) Log.d(TAG, "about to connect to service " + mServiceName);
socket.connectToService(mServiceName);
} else {
if (DBG) Log.d(TAG, "about to connect to port " + mPort);
socket.connectToSap(mPort);
}
int miu = socket.getRemoteMiu();
int fragmentLength = (mFragmentLength == -1) ? miu : Math.min(miu, mFragmentLength);
messenger = new SnepMessenger(true, socket, fragmentLength);
} catch (LlcpException e) {
throw new IOException("Could not connect to socket");
} catch (IOException e) {
if (socket != null) {
try {
socket.close();
} catch (IOException e2) {
}
}
throw new IOException("Failed to connect to socket");
}
synchronized (this) {
mMessenger = messenger;
mState = CONNECTED;
}
}
public void close() {
synchronized (this) {
if (mMessenger != null) {
try {
mMessenger.close();
} catch (IOException e) {
// ignore
} finally {
mMessenger = null;
mState = DISCONNECTED;
}
}
}
}
}
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