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 import java.io.OutputStream; 025 026 import org.apache.camel.RuntimeCamelException; 027 import org.apache.camel.StreamCache; 028 import org.apache.camel.util.IOHelper; 029 030 public class FileInputStreamCache extends InputStream implements StreamCache { 031 private InputStream stream; 032 private CachedOutputStream cachedOutputStream; 033 private File file; 034 035 public FileInputStreamCache() { 036 } 037 038 public FileInputStreamCache(File file, CachedOutputStream cos) throws FileNotFoundException { 039 this.file = file; 040 this.cachedOutputStream = cos; 041 this.stream = new FileInputStream(file); 042 } 043 044 @Override 045 public void close() { 046 try { 047 getInputStream().close(); 048 if (cachedOutputStream != null) { 049 cachedOutputStream.close(); 050 } 051 } catch (Exception e) { 052 throw new RuntimeCamelException(e); 053 } 054 } 055 056 @Override 057 public void reset() { 058 try { 059 getInputStream().close(); 060 // reset by creating a new stream based on the file 061 stream = new FileInputStream(file); 062 } catch (Exception e) { 063 throw new RuntimeCamelException(e); 064 } 065 } 066 067 public void writeTo(OutputStream os) throws IOException { 068 IOHelper.copy(getInputStream(), os); 069 } 070 071 @Override 072 public int available() throws IOException { 073 return getInputStream().available(); 074 } 075 076 @Override 077 public int read() throws IOException { 078 return getInputStream().read(); 079 } 080 081 protected InputStream getInputStream() throws FileNotFoundException { 082 if (file != null && stream == null) { 083 stream = new FileInputStream(file); 084 } 085 return stream; 086 } 087 088 }