/**
* 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.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.Serializable;
import javax.xml.transform.TransformerException;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;
import org.apache.camel.Converter;
import org.apache.camel.Exchange;
import org.apache.camel.StreamCache;
import org.apache.camel.converter.jaxp.BytesSource;
import org.apache.camel.converter.jaxp.StringSource;
import org.apache.camel.util.IOHelper;
/**
* A set of {@link Converter} methods for wrapping stream-based messages in a {@link StreamCache}
* implementation to ensure message re-readability (eg multicasting, retrying)
*/
@Converter
public class StreamCacheConverter {
@Converter
public StreamCache convertToStreamCache(StreamSource source, Exchange exchange) throws IOException {
return new StreamSourceCache(source, exchange);
}
@Converter
public StreamCache convertToStreamCache(StringSource source) {
//no need to do stream caching for a StringSource
return null;
}
@Converter
public StreamCache convertToStreamCache(BytesSource source) {
//no need to do stream caching for a BytesSource
return null;
}
@Converter
public StreamCache convertToStreamCache(SAXSource source, Exchange exchange) throws TransformerException {
String data = exchange.getContext().getTypeConverter().convertTo(String.class, source);
return new SourceCache(data);
}
@Converter
public StreamCache convertToStreamCache(InputStream stream, Exchange exchange) throws IOException {
CachedOutputStream cos = new CachedOutputStream(exchange);
IOHelper.copyAndCloseInput(stream, cos);
return cos.getStreamCache();
}
@Converter
public StreamCache convertToStreamCache(Reader reader, Exchange exchange) throws IOException {
String data = exchange.getContext().getTypeConverter().convertTo(String.class, reader);
return new ReaderCache(data);
}
@Converter
public Serializable convertToSerializable(StreamCache cache, Exchange exchange) throws IOException {
byte[] data = convertToByteArray(cache, exchange);
return new BytesSource(data);
}
@Converter
public byte[] convertToByteArray(StreamCache cache, Exchange exchange) throws IOException {
// lets serialize it as a byte array
ByteArrayOutputStream os = new ByteArrayOutputStream();
cache.writeTo(os);
return os.toByteArray();
}
}