abstractbinaryoutput.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 199 行

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.quercus.lib.file;

import com.caucho.quercus.QuercusModuleException;
import com.caucho.quercus.env.BooleanValue;
import com.caucho.quercus.env.Value;
import com.caucho.vfs.TempBuffer;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * Represents a PHP open file
 */
abstract public class AbstractBinaryOutput
  extends OutputStream
  implements BinaryOutput
{
  private int lockedShared = 0;
  private boolean lockedExclusive = false;

  /**
   * Returns self as the output stream.
   */
  public OutputStream getOutputStream()
  {
    return this;
  }

  /**
   * Writes to a stream.
   */
  public int write(InputStream is, int length)
  {
    int writeLength = 0;

    TempBuffer tb = TempBuffer.allocate();
    byte []buffer = tb.getBuffer();

    try {
      while (length > 0) {
	int sublen;

	if (length < buffer.length)
	  sublen = length;
	else
	  sublen = buffer.length;

	sublen = is.read(buffer, 0, sublen);

	if (sublen < 0)
	  break;

	write(buffer, 0, sublen);

	writeLength += sublen;
	length -= sublen;
      }

      return writeLength;
    } catch (IOException e) {
      throw new QuercusModuleException(e);
    } finally {
      TempBuffer.free(tb);
    }
  }
  
  /**
   * Prints a string to a file.
   */
  public void print(char v)
    throws IOException
  {
    write((byte) v);
  }

  /**
   * Prints a string to a file.
   */
  public void print(String v)
    throws IOException
  {
    for (int i = 0; i < v.length(); i++)
      write(v.charAt(i));
  }

  /**
   * Flushes the output.
   */
  public void flush()
    throws IOException
  {
  }


  /**
   * Closes the file.
   */
  public void closeWrite()
  {
    close();
  }

  /**
   * Closes the stream.
   */
  public void close()
  {
  }

  /**
   * Returns false always for output streams
   */
  public boolean isEOF()
  {
    return false;
  }

  /**
   * Tells the position in the stream
   */
  public long getPosition()
  {
    return 0;
  }

  /**
   * Sets the position.
   */
  public boolean setPosition(long offset)
  {
    return false;
  }

  public long seek(long offset, int whence)
  {
    long position;

    switch (whence) {
      case BinaryStream.SEEK_CUR:
        position = getPosition() + offset;
        break;
      case BinaryStream.SEEK_END:
        // don't necessarily have an end
        position = getPosition();
        break;
      case BinaryStream.SEEK_SET:
      default:
        position = offset;
        break;
    }

    if (! setPosition(position))
      return -1L;
    else
      return position;
  }

  public String getResourceType()
  {
    return "stream";
  }

  public Value stat()
  {
    return BooleanValue.FALSE;
  }
}