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 */ 017package org.apache.camel.builder.xml; 018 019import java.io.IOException; 020import java.io.InputStream; 021import javax.xml.transform.Source; 022import javax.xml.transform.TransformerException; 023import javax.xml.transform.URIResolver; 024import javax.xml.transform.stream.StreamSource; 025 026import org.apache.camel.CamelContext; 027import org.apache.camel.util.FileUtil; 028import org.apache.camel.util.ObjectHelper; 029import org.apache.camel.util.ResourceHelper; 030import org.slf4j.Logger; 031import org.slf4j.LoggerFactory; 032 033/** 034 * Camel specific {@link javax.xml.transform.URIResolver} which is capable of loading files 035 * from classpath, file system and more. 036 * <p/> 037 * You can prefix with: classpath, file, http, ref, or bean. 038 * classpath, file and http loads the resource using these protocols (classpath is default). 039 * ref will lookup the resource in the registry. 040 * bean will call a method on a bean to be used as the resource. 041 * For bean you can specify the method name after dot, eg bean:myBean.myMethod 042 * 043 * @version 044 */ 045public class XsltUriResolver implements URIResolver { 046 047 private static final Logger LOG = LoggerFactory.getLogger(XsltUriResolver.class); 048 049 private final CamelContext context; 050 private final String location; 051 private final String baseScheme; 052 053 public XsltUriResolver(CamelContext context, String location) { 054 this.context = context; 055 this.location = location; 056 if (ResourceHelper.hasScheme(location)) { 057 baseScheme = ResourceHelper.getScheme(location); 058 } else { 059 // default to use classpath 060 baseScheme = "classpath:"; 061 } 062 } 063 064 @Override 065 public Source resolve(String href, String base) throws TransformerException { 066 // supports the empty href 067 if (ObjectHelper.isEmpty(href)) { 068 href = location; 069 } 070 if (ObjectHelper.isEmpty(href)) { 071 throw new TransformerException("include href is empty"); 072 } 073 074 LOG.trace("Resolving URI with href: {} and base: {}", href, base); 075 076 String scheme = ResourceHelper.getScheme(href); 077 if (scheme != null) { 078 // need to compact paths for file/classpath as it can be relative paths using .. to go backwards 079 if ("file:".equals(scheme)) { 080 // compact path use file OS separator 081 href = FileUtil.compactPath(href); 082 } else if ("classpath:".equals(scheme)) { 083 // for classpath always use / 084 href = FileUtil.compactPath(href, '/'); 085 } 086 LOG.debug("Resolving URI from {}: {}", scheme, href); 087 088 InputStream is; 089 try { 090 is = ResourceHelper.resolveMandatoryResourceAsInputStream(context, href); 091 } catch (IOException e) { 092 throw new TransformerException(e); 093 } 094 return new StreamSource(is); 095 } 096 097 // if href and location is the same, then its the initial resolve 098 if (href.equals(location)) { 099 String path = baseScheme + href; 100 return resolve(path, base); 101 } 102 103 // okay then its relative to the starting location from the XSLT component 104 String path = FileUtil.onlyPath(location); 105 if (ObjectHelper.isEmpty(path)) { 106 path = baseScheme + href; 107 return resolve(path, base); 108 } else { 109 if (ResourceHelper.hasScheme(path)) { 110 path = path + "/" + href; 111 } else { 112 path = baseScheme + path + "/" + href; 113 } 114 return resolve(path, base); 115 } 116 } 117 118}