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.ByteArrayOutputStream;
020 import java.io.IOException;
021 import java.io.InputStream;
022 import java.io.Reader;
023 import java.io.Serializable;
024 import javax.xml.transform.TransformerException;
025 import javax.xml.transform.sax.SAXSource;
026 import javax.xml.transform.stream.StreamSource;
027
028 import org.apache.camel.Converter;
029 import org.apache.camel.Exchange;
030 import org.apache.camel.StreamCache;
031 import org.apache.camel.converter.jaxp.BytesSource;
032 import org.apache.camel.converter.jaxp.StringSource;
033 import org.apache.camel.util.IOHelper;
034
035 /**
036 * A set of {@link Converter} methods for wrapping stream-based messages in a {@link StreamCache}
037 * implementation to ensure message re-readability (eg multicasting, retrying)
038 */
039 @Converter
040 public class StreamCacheConverter {
041
042 @Converter
043 public StreamCache convertToStreamCache(StreamSource source, Exchange exchange) throws IOException {
044 return new StreamSourceCache(source, exchange);
045 }
046
047 @Converter
048 public StreamCache convertToStreamCache(StringSource source) {
049 //no need to do stream caching for a StringSource
050 return null;
051 }
052
053 @Converter
054 public StreamCache convertToStreamCache(BytesSource source) {
055 //no need to do stream caching for a BytesSource
056 return null;
057 }
058
059 @Converter
060 public StreamCache convertToStreamCache(SAXSource source, Exchange exchange) throws TransformerException {
061 String data = exchange.getContext().getTypeConverter().convertTo(String.class, source);
062 return new SourceCache(data);
063 }
064
065 @Converter
066 public StreamCache convertToStreamCache(InputStream stream, Exchange exchange) throws IOException {
067 // set up CachedOutputStream with the properties
068 CachedOutputStream cos = new CachedOutputStream(exchange.getContext().getProperties());
069 IOHelper.copyAndCloseInput(stream, cos);
070 return cos.getStreamCache();
071 }
072
073 @Converter
074 public StreamCache convertToStreamCache(Reader reader, Exchange exchange) throws IOException {
075 String data = exchange.getContext().getTypeConverter().convertTo(String.class, reader);
076 return new ReaderCache(data);
077 }
078
079 @Converter
080 public Serializable convertToSerializable(StreamCache cache, Exchange exchange) throws IOException {
081 byte[] data = convertToByteArray(cache, exchange);
082 return new BytesSource(data);
083 }
084
085 @Converter
086 public byte[] convertToByteArray(StreamCache cache, Exchange exchange) throws IOException {
087 // lets serialize it as a byte array
088 ByteArrayOutputStream os = new ByteArrayOutputStream();
089 cache.writeTo(os);
090 return os.toByteArray();
091 }
092
093 }