1 /*
2 * #%L
3 * settings4j
4 * ===============================================================
5 * Copyright (C) 2008 - 2015 Brabenetz Harald, Austria
6 * ===============================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * #L%
19 */
20 package org.settings4j.config;
21
22 import java.io.ByteArrayInputStream;
23 import java.io.InputStream;
24
25 import org.xml.sax.EntityResolver;
26 import org.xml.sax.InputSource;
27
28 /**
29 * An {@link EntityResolver} specifically designed to return <code>settings4j.dtd</code> which is
30 * embedded within the settings4j jar file.
31 *
32 * @author Harald.Brabenetz
33 */
34 public class Settings4jEntityResolver implements EntityResolver {
35
36 /** General Logger for this Class. */
37 private static final org.slf4j.Logger LOG = org.slf4j.LoggerFactory.getLogger(Settings4jEntityResolver.class);
38
39 @Override
40 public InputSource resolveEntity(final String publicId, final String systemId) {
41 if (systemId.endsWith("settings4j.dtd")) {
42 final Class<?> clazz = getClass();
43 InputStream in = clazz.getResourceAsStream("/org/settings4j/config/settings4j.dtd");
44 if (in == null) {
45 LOG.warn("Could not find [settings4j.dtd] using [{}] class loader, parsed without DTD.",
46 clazz.getClassLoader());
47 in = new ByteArrayInputStream(new byte[0]);
48 }
49 return new InputSource(in);
50 }
51
52 return null;
53 }
54 }