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.IOException; 020 import java.io.InputStream; 021 import java.io.Reader; 022 import java.io.StringReader; 023 024 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 import org.apache.commons.logging.Log; 035 import org.apache.commons.logging.LogFactory; 036 037 /** 038 * A set of {@link Converter} methods for wrapping stream-based messages in a {@link StreamCache} 039 * implementation to ensure message re-readability (eg multicasting, retrying) 040 */ 041 @Converter 042 public class StreamCacheConverter { 043 private static final transient Log LOG = LogFactory.getLog(StreamCacheConverter.class); 044 045 @Converter 046 public StreamCache convertToStreamCache(StreamSource source, Exchange exchange) throws IOException { 047 return new StreamSourceCache(source, exchange); 048 } 049 050 @Converter 051 public StreamCache convertToStreamCache(StringSource source) { 052 //no need to do stream caching for a StringSource 053 return null; 054 } 055 056 @Converter 057 public StreamCache convertToStreamCache(BytesSource source) { 058 //no need to do stream caching for a BytesSource 059 return null; 060 } 061 062 @Converter 063 public StreamCache convertToStreamCache(SAXSource source, Exchange exchange) throws TransformerException { 064 String data = exchange.getContext().getTypeConverter().convertTo(String.class, source); 065 return new SourceCache(data); 066 } 067 068 @Converter 069 public StreamCache convertToStreamCache(InputStream stream, Exchange exchange) throws IOException { 070 // set up CachedOutputStream with the properties 071 CachedOutputStream cos = new CachedOutputStream(exchange.getContext().getProperties()); 072 IOHelper.copyAndCloseInput(stream, cos); 073 return cos.getStreamCache(); 074 } 075 076 @Converter 077 public StreamCache convertToStreamCache(Reader reader, Exchange exchange) throws IOException { 078 String data = exchange.getContext().getTypeConverter().convertTo(String.class, reader); 079 return new ReaderCache(data); 080 } 081 082 /* 083 * {@link StreamCache} implementation for {@link Source}s 084 */ 085 private class SourceCache extends StringSource implements StreamCache { 086 087 private static final long serialVersionUID = 4147248494104812945L; 088 089 public SourceCache() { 090 } 091 092 public SourceCache(String text) { 093 super(text); 094 } 095 096 public void reset() { 097 // do nothing here 098 } 099 100 } 101 102 /* 103 * {@link StreamCache} implementation for Cache the StreamSource {@link StreamSource}s 104 */ 105 private class StreamSourceCache extends StreamSource implements StreamCache { 106 StreamCache streamCache; 107 ReaderCache readCache; 108 109 public StreamSourceCache(StreamSource source, Exchange exchange) throws IOException { 110 if (source.getInputStream() != null) { 111 // set up CachedOutputStream with the properties 112 CachedOutputStream cos = new CachedOutputStream(exchange.getContext().getProperties()); 113 IOHelper.copyAndCloseInput(source.getInputStream(), cos); 114 streamCache = cos.getStreamCache(); 115 setInputStream((InputStream)streamCache); 116 setSystemId(source.getSystemId()); 117 } 118 if (source.getReader() != null) { 119 String data = exchange.getContext().getTypeConverter().convertTo(String.class, source.getReader()); 120 readCache = new ReaderCache(data); 121 setReader(readCache); 122 } 123 } 124 125 public void reset() { 126 if (streamCache != null) { 127 streamCache.reset(); 128 } 129 if (readCache != null) { 130 readCache.reset(); 131 } 132 } 133 134 } 135 136 private class ReaderCache extends StringReader implements StreamCache { 137 138 public ReaderCache(String s) { 139 super(s); 140 } 141 142 public void reset() { 143 try { 144 super.reset(); 145 } catch (IOException e) { 146 LOG.warn("Cannot reset cache", e); 147 } 148 } 149 150 public void close() { 151 // Do not release the string for caching 152 } 153 154 } 155 156 157 158 159 }