1 /*
2 * Copyright 2010, 2011 Christopher Pheby
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.jadira.bindings.core.loader;
17
18 import java.io.IOException;
19 import java.io.InputStream;
20
21 import org.xml.sax.EntityResolver;
22 import org.xml.sax.InputSource;
23 import org.xml.sax.SAXException;
24
25 /**
26 * A SAX entity resolving capable of resolving files from the classpath when
27 * prefixed with the custom 'classpath:/' URL scheme
28 */
29 public class BindingXmlEntityResolver implements EntityResolver {
30
31 private static final String CLASSPATH_SCHEME = "classpath:/";
32
33 public InputSource resolveEntity(String publicId, String systemId)
34 throws SAXException, IOException {
35
36 if (systemId.startsWith(CLASSPATH_SCHEME)) {
37 String filename = systemId.substring(CLASSPATH_SCHEME.length());
38 InputStream stream = Thread.currentThread().getContextClassLoader()
39 .getResourceAsStream(filename);
40 return new InputSource(stream);
41 } else {
42 return null;
43 }
44 }
45 }