content: /*******************************************************************************
   * Software Name : RCS IMS Stack
   *
   * Copyright (C) 2010-2016 Orange.
   *
   * 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.orangelabs.rcs.core.ims.protocol.rtp.util;
  
  import java.io.IOException;
  import java.net.DatagramPacket;
  import java.net.DatagramSocket;
  import java.net.InetAddress;
  
  /**
   * Android datagram server connection
   * 
   * @author Jean-Marc AUFFRET
   */
  public class AndroidDatagramConnection implements DatagramConnection {
      /**
       * Datagram connection
       */
      private DatagramSocket connection = null;
  
      /**
       * Datagram Packet
       */
      private DatagramPacket packet = null;
  
      /**
       * Connection timeout
       */
      private int timeout = 0;
  
      /**
       * Constructor
       */
      public AndroidDatagramConnection() {
          packet = new DatagramPacket(new byte[DatagramConnection.DEFAULT_DATAGRAM_SIZE],
                  DatagramConnection.DEFAULT_DATAGRAM_SIZE);
      }
  
      /**
       * Constructor
       * 
       * @param timeout SO Timeout
       */
      public AndroidDatagramConnection(int timeout) {
          this();
          this.timeout = timeout;
      }
  
      /**
       * Open the datagram connection
       * 
       * @throws IOException
       */
      public void open() throws IOException {
          connection = new DatagramSocket();
          connection.setSoTimeout(timeout);
      }
  
      /**
       * Open the datagram connection
       * 
       * @param port Local port
       * @throws IOException
       */
      public void open(int port) throws IOException {
          connection = new DatagramSocket(port);
          connection.setSoTimeout(timeout);
      }
  
      /**
       * Close the datagram connection
       * 
       * @throws IOException
       */
      public void close() throws IOException {
          if (connection != null) {
              connection.close();
              connection = null;
          }
      }
  
      /**
       * Receive data with a specific buffer size
       * 
       * @return Byte array
       * @throws IOException
       */
      public byte[] receive() throws IOException {
          if (connection != null) {
              packet.setLength(DatagramConnection.DEFAULT_DATAGRAM_SIZE);
              connection.receive(packet);
  
              int packetLength = packet.getLength();
              byte[] data = new byte[packetLength];
              System.arraycopy(packet.getData(), 0, data, 0, packetLength);
              return data;
          } else {
              throw new IOException("Connection not openned");
          }
      }
  
      /**
       * Send data
       * 
       * @param remoteAddr Remote address
       * @param remotePort Remote port
       * @param data Data as byte array
       * @throws IOException
       */
      public void send(String remoteAddr, int remotePort, byte[] data) throws IOException {
          if (data == null) {
              return;
          }
  
          if (connection != null) {
              InetAddress address = InetAddress.getByName(remoteAddr);
              DatagramPacket packet = new DatagramPacket(data, data.length, address, remotePort);
              connection.send(packet);
          } else {
              throw new IOException("Connection not openned");
          }
      }
  
      /**
       * Returns the local address
       * 
       * @return Address
       * @throws IOException
       */
      public String getLocalAddress() throws IOException {
          if ((connection != null) && (connection.getLocalAddress() != null)) {
              return connection.getLocalAddress().getHostAddress();
          } else {
              throw new IOException("Connection not openned");
          }
      }
  
      /**
       * Returns the local port
       * 
       * @return Port
       * @throws IOException
       */
      public int getLocalPort() throws IOException {
          if (connection != null) {
              return connection.getLocalPort();
          } else {
              throw new IOException("Connection not openned");
          }
      }
  }
  