001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.servicemix.jbi.audit.file;
018    
019    import java.io.FilterInputStream;
020    import java.io.IOException;
021    import java.io.InputStream;
022    import java.io.OutputStream;
023    
024    /**
025     * {@link FilterInputStream} implementation that sends a copy of all data being processed to the specified OutputStream.
026     * 
027     * @author Gert Vanthienen (gertv)
028     * @since 3.2
029     */
030    public class TeeInputStream extends FilterInputStream {
031    
032        private final OutputStream os;
033    
034        /**
035         * Create a new TeeInputStream
036         * 
037         * @param is the InputStream to read from
038         * @param os the OuputStream to copy data to
039         */
040        public TeeInputStream(InputStream is, OutputStream os) {
041            super(is);
042            this.os = os;
043        }
044    
045        /**
046         * Reads a single byte from the underlying InputStream.  In addition, it also write the same byte to the OutputStream.
047         */
048        @Override
049        public int read() throws IOException {
050            int read = super.read();
051            if (read != -1) {
052                os.write(read);
053            }
054            return read;
055        }
056    
057        /**
058         * Read a block of bytes from the underlying InputStream.  In addition, write the same data to the OutputStream.
059         */
060        @Override
061        public int read(byte[] bytes, int offset, int length) throws IOException {
062            int read = super.read(bytes, offset, length);
063            if (read != -1) {
064                os.write(bytes, offset, read);
065            }
066            return read;
067        }
068    
069        /**
070         * Close the underlying InputStream.  Also, flush and close the underlying OutputStream.
071         */
072        @Override
073        public void close() throws IOException {
074            super.close();
075            os.flush();
076            os.close();
077        }
078    }