1 /* ***************************************************************************
2 * Copyright (c) 2008 Brabenetz Harald, Austria.
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 *****************************************************************************/
17 package org.settings4j.config;
18
19 import java.io.ByteArrayInputStream;
20 import java.io.InputStream;
21
22 import org.xml.sax.EntityResolver;
23 import org.xml.sax.InputSource;
24
25 /**
26 * An {@link EntityResolver} specifically designed to return <code>settings4j.dtd</code> which is
27 * embedded within the settings4j jar file.
28 *
29 * @author Harald.Brabenetz
30 */
31 public class Settings4jEntityResolver implements EntityResolver {
32
33 /** General Logger for this Class. */
34 private static final org.slf4j.Logger LOG = org.slf4j.LoggerFactory.getLogger(Settings4jEntityResolver.class);
35
36 /** {@inheritDoc} */
37 public InputSource resolveEntity(final String publicId, final String systemId) {
38 if (systemId.endsWith("settings4j.dtd")) {
39 final Class clazz = getClass();
40 InputStream in = clazz.getResourceAsStream("/org/settings4j/config/settings4j.dtd");
41 if (in == null) {
42 LOG.warn("Could not find [settings4j.dtd] using [{}] class loader, parsed without DTD.",
43 clazz.getClassLoader());
44 in = new ByteArrayInputStream(new byte[0]);
45 }
46 return new InputSource(in);
47 }
48
49 return null;
50 }
51 }