1 /**
2 * Copyright 2005-2012 The Kuali Foundation
3 *
4 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
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.kuali.rice.ken.util;
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 * Internal notification EntityResolver which resolves system ids with the "resource:" prefix to ClassLoader resources
27 * @author Kuali Rice Team (rice.collab@kuali.org)
28 */
29 public class ClassLoaderEntityResolver extends ClassLoaderResourceResolver implements EntityResolver {
30 /**
31 * Constructs a ClassLoaderEntityResolver.java.
32 */
33 public ClassLoaderEntityResolver() {
34 super();
35 }
36
37 /**
38 * Constructs a ClassLoaderEntityResolver.java.
39 * @param base
40 * @param prefix
41 */
42 public ClassLoaderEntityResolver(String base, String prefix) {
43 super(base, prefix);
44 }
45
46 /**
47 * @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String, java.lang.String)
48 */
49 public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
50 LOG.debug("Resolving '" + publicId + "' / '" + systemId + "'");
51 String path = resolveSystemId(systemId);
52 if (path == null) {
53 LOG.error("Unable to resolve system id '" + systemId + "' locally...delegating to default resolution strategy.");
54 return null;
55 }
56 LOG.debug("Looking up resource '" + path + "' for entity '" + systemId + "'");
57 InputStream is = getClass().getClassLoader().getResourceAsStream(path);
58 if (is == null) {
59 String message = "Unable to find schema (" + path + ") for: " + systemId;
60 LOG.warn(message);
61 // necessary if processContents is lax, because lax doesn't care...if it doesn't resolve it won't validate
62 // (not quite clear, as lax could be interpreted as *if the namespace is valid*, treating a present, but invalid
63 // namespace as a fatal error. instead, apparently a present but invalid namespace is ignored with 'lax'
64 // so w should use strict to ensure that is an error instead of throwing an exception here gratuitously
65 // which will screw up compound resolution
66 //throw new SAXException(message);
67 return null;
68 }
69 return new InputSource(is);
70 }
71
72 /**
73 * @see java.lang.Object#toString()
74 */
75 public String toString() {
76 return "[ClassLoaderEntityResolver: base=" + base + ", prefix=" + prefix + "]";
77 }
78 }