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