001 // Copyright 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.util.io; 016 017 import java.io.IOException; 018 import java.io.OutputStream; 019 020 import org.apache.hivemind.util.Defense; 021 022 /** 023 * An output stream that copies bytes pushed through it to two other output streams. 024 * 025 * @author Howard M. Lewis Ship 026 * @since 4.0 027 */ 028 public class TeeOutputStream extends OutputStream 029 { 030 private final OutputStream _os1; 031 032 private final OutputStream _os2; 033 034 public TeeOutputStream(OutputStream os1, OutputStream os2) 035 { 036 Defense.notNull(os1, "os1"); 037 Defense.notNull(os2, "os2"); 038 039 _os1 = os1; 040 _os2 = os2; 041 } 042 043 public void close() throws IOException 044 { 045 _os1.close(); 046 _os2.close(); 047 } 048 049 public void flush() throws IOException 050 { 051 _os1.flush(); 052 _os2.flush(); 053 } 054 055 public void write(byte[] b, int off, int len) throws IOException 056 { 057 _os1.write(b, off, len); 058 _os2.write(b, off, len); 059 } 060 061 public void write(byte[] b) throws IOException 062 { 063 _os1.write(b); 064 _os1.write(b); 065 } 066 067 public void write(int b) throws IOException 068 { 069 _os1.write(b); 070 _os2.write(b); 071 } 072 }