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JPPF, the open source grid computing solution
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/*
 * JPPF.
 * Copyright (C) 2005-2015 JPPF Team.
 * http://www.jppf.org
 *
 * 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 org.jppf.io;

import java.io.*;
import java.nio.ByteBuffer;

import org.jppf.comm.socket.SocketWrapper;

/**
 * Input source backed by a {@link org.jppf.comm.socket.SocketWrapper SocketWrapper}.
 * @author Laurent Cohen
 */
public class SocketWrapperInputSource implements InputSource {
  /**
   * The backing SocketWrapper.
   */
  private SocketWrapper socketWrapper = null;

  /**
   * Initialize this input source with the specified SocketWrapper.
   * @param socketWrapper the backing SocketWrapper.
   */
  public SocketWrapperInputSource(final SocketWrapper socketWrapper) {
    this.socketWrapper = socketWrapper;
  }

  /**
   * Read data from this input source into an array of bytes.
   * @param data the buffer into which to write.
   * @param offset the position in the buffer where to start storing the data.
   * @param len the size in bytes of the data to read.
   * @return the number of bytes actually read, or -1 if end of stream was reached.
   * @throws Exception if an IO error occurs.
   */
  @Override
  public int read(final byte[] data, final int offset, final int len) throws Exception {
    int n = socketWrapper.read(data, offset, len);
    if (n < 0) throw new EOFException();
    return n;
  }

  /**
   * Read data from this input source into a byte buffer.
   * @param data the buffer into which to write.
   * @return the number of bytes actually read, or -1 if end of stream was reached.
   * @throws Exception if an IO error occurs.
   */
  @Override
  public int read(final ByteBuffer data) throws Exception {
    byte[] buf =  IO.TEMP_BUFFER_POOL.get();
    try {
      int size = Math.min(buf.length, data.remaining());
      int n = read(buf, 0, size);
      if (n > 0) data.put(buf, 0, n);
      return n;
    } finally {
      IO.TEMP_BUFFER_POOL.put(buf);
    }
  }

  /**
   * Read an int value from this input source.
   * @return the value read, or -1 if an end of file condition was reached.
   * @throws Exception if an IO error occurs.
   */
  @Override
  public int readInt() throws Exception {
    return socketWrapper.readInt();
  }

  /**
   * Skip n bytes of data form this input source.
   * @param n the number of bytes to skip.
   * @return the number of bytes actually skipped.
   * @throws Exception if an IO error occurs.
   */
  @Override
  public int skip(final int n) throws Exception {
    return socketWrapper.skip(n);
  }

  /**
   * This method does nothing.
   * @throws IOException if an IO error occurs.
   */
  @Override
  public void close() throws IOException {
  }
}