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 }