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
015package org.apache.tapestry.util.io;
016
017import java.io.IOException;
018import java.io.OutputStream;
019
020import 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 */
028public 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}