1 /*
2 * Copyright 2009 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.openehealth.ipf.commons.xml;
17
18 import java.net.URL;
19
20 import javax.xml.transform.Source;
21 import javax.xml.transform.TransformerException;
22 import javax.xml.transform.URIResolver;
23 import javax.xml.transform.sax.SAXSource;
24
25 import org.xml.sax.InputSource;
26
27 /**
28 * URIResolver used to correctly resolve import commands in xslt or xquery
29 * content. The referenced resource (stylesheet or document) can be found
30 * somewhere in the classloader's classpath. If it can't be found, the default
31 * URIResolver is used.
32 *
33 * @author Christian Ohr
34 */
35 class ClasspathUriResolver implements URIResolver {
36
37 private final URIResolver standardResolver;
38
39 public ClasspathUriResolver(URIResolver resolver) {
40 super();
41 standardResolver = resolver;
42 }
43
44 /**
45 * Resolve by searching the classpath, fallback to default resolution
46 * strategy.
47 *
48 */
49 @Override
50 public Source resolve(String href, String base) throws TransformerException {
51 ClassLoader cl = getClass().getClassLoader();
52 URL url = cl.getResource(href);
53 if (url != null) {
54 SAXSource saxSource = new SAXSource();
55 saxSource.setInputSource(new InputSource(url.toString()));
56 saxSource.setSystemId(url.toString());
57 return saxSource;
58 } else {
59 return standardResolver.resolve(href, base);
60 }
61 }
62
63 }