org.apache.camel.converter.stream.FileInputStreamCache Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.camel.converter.stream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.StreamCache;
import org.apache.camel.util.IOHelper;
public class FileInputStreamCache extends InputStream implements StreamCache {
private InputStream stream;
private File file;
public FileInputStreamCache(File file) throws FileNotFoundException {
this.file = file;
this.stream = IOHelper.buffered(new FileInputStream(file));
}
@Override
public void close() {
if (stream != null) {
IOHelper.close(stream);
}
}
@Override
public void reset() {
try {
// reset by closing and creating a new stream based on the file
close();
// reset by creating a new stream based on the file
stream = IOHelper.buffered(new FileInputStream(file));
} catch (FileNotFoundException e) {
throw new RuntimeCamelException("Cannot reset stream from file " + file, e);
}
}
public void writeTo(OutputStream os) throws IOException {
IOHelper.copy(getInputStream(), os);
}
@Override
public int available() throws IOException {
return getInputStream().available();
}
@Override
public int read() throws IOException {
return getInputStream().read();
}
protected InputStream getInputStream() {
return stream;
}
}