/**
* 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.processor.cache;
import java.io.File;
import java.io.InputStream;
import java.io.StringReader;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import org.w3c.dom.Document;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Ehcache;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.component.cache.CacheConstants;
import org.apache.camel.component.cache.DefaultCacheManagerFactory;
import org.apache.camel.converter.IOConverter;
import org.apache.camel.converter.jaxp.XmlConverter;
import org.apache.camel.util.IOHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CacheBasedXPathReplacer extends CacheValidate implements Processor {
private static final transient Logger LOG = LoggerFactory.getLogger(CacheBasedXPathReplacer.class);
private String cacheName;
private String key;
private String xpath;
private CacheManager cacheManager;
private Ehcache cache;
private Document document;
private DOMSource source;
private DOMResult result;
public CacheBasedXPathReplacer(String cacheName, String key, String xpath) {
if (cacheName.contains("cache://")) {
this.setCacheName(cacheName.replace("cache://", ""));
} else {
this.setCacheName(cacheName);
}
this.key = key;
this.xpath = xpath;
}
public void process(Exchange exchange) throws Exception {
// Cache the buffer to the specified Cache against the specified key
cacheManager = new DefaultCacheManagerFactory().getInstance();
if (isValid(cacheManager, cacheName, key)) {
cache = cacheManager.getCache(cacheName);
if (LOG.isDebugEnabled()) {
LOG.debug("Replacing XPath value {} in Message with value stored against key {} in CacheName {}",
new Object[]{xpath, key, cacheName});
}
exchange.getIn().setHeader(CacheConstants.CACHE_KEY, key);
Object body = exchange.getIn().getBody();
InputStream is = exchange.getContext().getTypeConverter().convertTo(InputStream.class, body);
try {
document = exchange.getContext().getTypeConverter().convertTo(Document.class, exchange, is);
} finally {
IOHelper.close(is, "is", LOG);
}
InputStream cis = exchange.getContext().getTypeConverter()
.convertTo(InputStream.class, cache.get(key).getObjectValue());
try {
Document cacheValueDocument = exchange.getContext().getTypeConverter()
.convertTo(Document.class, exchange, cis);
// Create/setup the Transformer
XmlConverter xmlConverter = new XmlConverter();
String xslString = IOConverter.toString(new File("./src/main/resources/xpathreplacer.xsl"), exchange);
xslString = xslString.replace("##match_token##", xpath);
Source xslSource = xmlConverter.toStreamSource(new StringReader(xslString));
TransformerFactory transformerFactory = xmlConverter.createTransformerFactory();
Transformer transformer = transformerFactory.newTransformer(xslSource);
source = xmlConverter.toDOMSource(document);
result = new DOMResult();
transformer.setParameter("cacheValue", cacheValueDocument);
transformer.transform(source, result);
} finally {
IOHelper.close(cis, "cis", LOG);
}
}
// DOMSource can be converted to byte[] by camel type converter mechanism
DOMSource dom = new DOMSource(result.getNode());
exchange.getIn().setBody(dom, byte[].class);
}
public String getCacheName() {
return cacheName;
}
public void setCacheName(String cacheName) {
this.cacheName = cacheName;
}
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public String getXpath() {
return xpath;
}
public void setXpath(String xpath) {
this.xpath = xpath;
}
}