001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.commons.compress.utils; 020 021import java.io.FilterOutputStream; 022import java.io.IOException; 023import java.io.OutputStream; 024 025/** 026 * Stream that tracks the number of bytes read. 027 * @since 1.3 028 * @NotThreadSafe 029 */ 030public class CountingOutputStream extends FilterOutputStream { 031 private long bytesWritten = 0; 032 033 public CountingOutputStream(final OutputStream out) { 034 super(out); 035 } 036 037 @Override 038 public void write(final int b) throws IOException { 039 out.write(b); 040 count(1); 041 } 042 @Override 043 public void write(final byte[] b) throws IOException { 044 write(b, 0, b.length); 045 } 046 @Override 047 public void write(final byte[] b, final int off, final int len) throws IOException { 048 out.write(b, off, len); 049 count(len); 050 } 051 052 /** 053 * Increments the counter of already written bytes. 054 * Doesn't increment if the EOF has been hit (written == -1) 055 * 056 * @param written the number of bytes written 057 */ 058 protected void count(final long written) { 059 if (written != -1) { 060 bytesWritten += written; 061 } 062 } 063 064 /** 065 * Returns the current number of bytes written to this stream. 066 * @return the number of written bytes 067 */ 068 public long getBytesWritten() { 069 return bytesWritten; 070 } 071}