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.camel.converter.stream;
018    
019    import java.io.File;
020    import java.io.FileInputStream;
021    import java.io.FileNotFoundException;
022    import java.io.IOException;
023    import java.io.InputStream;
024    
025    import org.apache.camel.RuntimeCamelException;
026    import org.apache.camel.StreamCache;
027    
028    public class FileInputStreamCache extends InputStream implements StreamCache {
029        private FileInputStream inputStream;
030        private CachedOutputStream cachedOutputStream;
031        private File file;
032    
033        public FileInputStreamCache(File file, CachedOutputStream cos) throws FileNotFoundException {
034            this.file = file;
035            cachedOutputStream = cos;
036            inputStream = new FileInputStream(file);       
037        }
038        
039        public void close() {
040            try {
041                inputStream.close();
042                cachedOutputStream.close();
043            } catch (Exception exception) {
044                throw new RuntimeCamelException(exception);
045            } 
046        }
047    
048        public void reset() {            
049            try {
050                inputStream.close();            
051                inputStream = new FileInputStream(file);
052            } catch (Exception exception) {
053                throw new RuntimeCamelException(exception);
054            }            
055        }
056        
057        public int available() throws IOException {
058            return inputStream.available();
059        }
060    
061        @Override
062        public int read() throws IOException {
063            return inputStream.read();
064        }   
065        
066    }