content: /*
   * Copyright (c) 1994, 2011, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code 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.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package java.io;
  
  /**
   * This class is the superclass of all classes that filter output
   * streams. These streams sit on top of an already existing output
   * stream (the <i>underlying</i> output stream) which it uses as its
   * basic sink of data, but possibly transforming the data along the
   * way or providing additional functionality.
   * <p>
   * The class <code>FilterOutputStream</code> itself simply overrides
   * all methods of <code>OutputStream</code> with versions that pass
   * all requests to the underlying output stream. Subclasses of
   * <code>FilterOutputStream</code> may further override some of these
   * methods as well as provide additional methods and fields.
   *
   * @author  Jonathan Payne
   * @since   JDK1.0
   */
  public
  class FilterOutputStream extends OutputStream {
      /**
       * The underlying output stream to be filtered.
       */
      protected OutputStream out;
  
      // Android-added: Integrate OpenJDK 9 fix for double-close. http://b/122733269.
      /**
       * Whether the stream is closed; implicitly initialized to false.
       */
      private boolean closed;
  
      /**
       * Creates an output stream filter built on top of the specified
       * underlying output stream.
       *
       * @param   out   the underlying output stream to be assigned to
       *                the field <tt>this.out</tt> for later use, or
       *                <code>null</code> if this instance is to be
       *                created without an underlying stream.
       */
      public FilterOutputStream(OutputStream out) {
          this.out = out;
      }
  
      /**
       * Writes the specified <code>byte</code> to this output stream.
       * <p>
       * The <code>write</code> method of <code>FilterOutputStream</code>
       * calls the <code>write</code> method of its underlying output stream,
       * that is, it performs <tt>out.write(b)</tt>.
       * <p>
       * Implements the abstract <tt>write</tt> method of <tt>OutputStream</tt>.
       *
       * @param      b   the <code>byte</code>.
       * @exception  IOException  if an I/O error occurs.
       */
      public void write(int b) throws IOException {
          out.write(b);
      }
  
      /**
       * Writes <code>b.length</code> bytes to this output stream.
       * <p>
       * The <code>write</code> method of <code>FilterOutputStream</code>
       * calls its <code>write</code> method of three arguments with the
       * arguments <code>b</code>, <code>0</code>, and
       * <code>b.length</code>.
       * <p>
       * Note that this method does not call the one-argument
       * <code>write</code> method of its underlying stream with the single
       * argument <code>b</code>.
       *
       * @param      b   the data to be written.
       * @exception  IOException  if an I/O error occurs.
       * @see        FilterOutputStream#write(byte[], int, int)
       */
      public void write(byte b[]) throws IOException {
          write(b, 0, b.length);
      }
  
      /**
       * Writes <code>len</code> bytes from the specified
       * <code>byte</code> array starting at offset <code>off</code> to
       * this output stream.
       * <p>
       * The <code>write</code> method of <code>FilterOutputStream</code>
       * calls the <code>write</code> method of one argument on each
       * <code>byte</code> to output.
       * <p>
       * Note that this method does not call the <code>write</code> method
       * of its underlying input stream with the same arguments. Subclasses
       * of <code>FilterOutputStream</code> should provide a more efficient
       * implementation of this method.
       *
       * @param      b     the data.
       * @param      off   the start offset in the data.
       * @param      len   the number of bytes to write.
       * @exception  IOException  if an I/O error occurs.
       * @see        FilterOutputStream#write(int)
       */
      public void write(byte b[], int off, int len) throws IOException {
          if ((off | len | (b.length - (len + off)) | (off + len)) < 0)
              throw new IndexOutOfBoundsException();
  
          for (int i = 0 ; i < len ; i++) {
              write(b[off + i]);
          }
      }
  
      /**
       * Flushes this output stream and forces any buffered output bytes
       * to be written out to the stream.
       * <p>
       * The <code>flush</code> method of <code>FilterOutputStream</code>
       * calls the <code>flush</code> method of its underlying output stream.
       *
       * @exception  IOException  if an I/O error occurs.
       * @see        FilterOutputStream#out
       */
      public void flush() throws IOException {
          out.flush();
      }
  
      /**
       * Closes this output stream and releases any system resources
       * associated with the stream.
       * <p>
       * When not already closed, the {@code close} method of {@code
       * FilterOutputStream} calls its {@code flush} method, and then
       * calls the {@code close} method of its underlying output stream.
       *
       * @exception  IOException  if an I/O error occurs.
       * @see        FilterOutputStream#flush()
       * @see        FilterOutputStream#out
       */
      // BEGIN Android-changed: Integrate OpenJDK 9 fix for double-close. http://b/122733269.
      /*
      @SuppressWarnings("try")
      public void close() throws IOException {
          try (OutputStream ostream = out) {
              flush();
          }
      }
      */
      @Override
      public void close() throws IOException {
          if (closed) {
              return;
          }
          closed = true;
  
          Throwable flushException = null;
          try {
              flush();
          } catch (Throwable e) {
              flushException = e;
              throw e;
          } finally {
              if (flushException == null) {
                  out.close();
              } else {
                  try {
                      out.close();
                  } catch (Throwable closeException) {
                     // evaluate possible precedence of flushException over closeException
                     if ((flushException instanceof ThreadDeath) &&
                         !(closeException instanceof ThreadDeath)) {
                         flushException.addSuppressed(closeException);
                         throw (ThreadDeath) flushException;
                     }
  
                      if (flushException != closeException) {
                          closeException.addSuppressed(flushException);
                      }
  
                      throw closeException;
                  }
              }
          }
      }
      // END Android-changed: Integrate OpenJDK 9 fix for double-close. http://b/122733269.
  }
  