| /** |
| * 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) { |
| super(); |
| 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; |
| } |
| |
| } |