| /* |
| * Copyright 2002-2005 The Apache Software Foundation. |
| * |
| * 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.apache.commons.vfs.util; |
| |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * An InputStream that provides buffering and end-of-stream monitoring. |
| * |
| * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a> |
| * @version $Revision$ $Date$ |
| */ |
| public class MonitorInputStream |
| extends BufferedInputStream |
| { |
| private boolean finished; |
| private long count; |
| |
| public MonitorInputStream(final InputStream in) |
| { |
| super(in); |
| count = 0; |
| } |
| |
| /** |
| * Reads a character. |
| */ |
| public int read() throws IOException |
| { |
| if (finished) |
| { |
| return -1; |
| } |
| |
| final int ch = super.read(); |
| if (ch != -1) |
| { |
| count++; |
| return ch; |
| } |
| |
| // End-of-stream |
| close(); |
| return -1; |
| } |
| |
| /** |
| * Reads bytes from this input stream.error occurs. |
| */ |
| public int read(final byte[] buffer, final int offset, final int length) |
| throws IOException |
| { |
| if (finished) |
| { |
| return -1; |
| } |
| |
| final int nread = super.read(buffer, offset, length); |
| if (nread != -1) |
| { |
| count += nread; |
| return nread; |
| } |
| |
| // End-of-stream |
| close(); |
| return -1; |
| } |
| |
| /** |
| * Closes this input stream and releases any system resources |
| * associated with the stream. |
| */ |
| public void close() throws IOException |
| { |
| if (finished) |
| { |
| return; |
| } |
| |
| // Close the stream |
| IOException exc = null; |
| try |
| { |
| super.close(); |
| } |
| catch (final IOException ioe) |
| { |
| exc = ioe; |
| } |
| |
| // Notify that the stream has been closed |
| try |
| { |
| onClose(); |
| } |
| catch (final IOException ioe) |
| { |
| exc = ioe; |
| } |
| |
| finished = true; |
| if (exc != null) |
| { |
| throw exc; |
| } |
| } |
| |
| /** |
| * Called after the stream has been closed. This implementation does |
| * nothing. |
| */ |
| protected void onClose() throws IOException |
| { |
| } |
| |
| /** |
| * Get the nuber of bytes read by this input stream |
| */ |
| public long getCount() |
| { |
| return count; |
| } |
| } |