1 /*
2 * Copyright 2002-2012 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
17 package org.springframework.xml.sax;
18
19 import java.io.IOException;
20 import java.net.URI;
21 import java.net.URISyntaxException;
22
23 import org.springframework.core.io.Resource;
24
25 import org.apache.commons.logging.Log;
26 import org.apache.commons.logging.LogFactory;
27 import org.xml.sax.InputSource;
28
29 /**
30 * Convenient utility methods for dealing with SAX.
31 *
32 * @author Arjen Poutsma
33 * @since 1.0.0
34 */
35 public abstract class SaxUtils {
36
37 private static final Log logger = LogFactory.getLog(SaxUtils.class);
38
39 /**
40 * Creates a SAX <code>InputSource</code> from the given resource. Sets the system identifier to the resource's
41 * <code>URL</code>, if available.
42 *
43 * @param resource the resource
44 * @return the input source created from the resource
45 * @throws IOException if an I/O exception occurs
46 * @see InputSource#setSystemId(String)
47 * @see #getSystemId(org.springframework.core.io.Resource)
48 */
49 public static InputSource createInputSource(Resource resource) throws IOException {
50 InputSource inputSource = new InputSource(resource.getInputStream());
51 inputSource.setSystemId(getSystemId(resource));
52 return inputSource;
53 }
54
55 /** Retrieves the URL from the given resource as System ID. Returns <code>null</code> if it cannot be opened. */
56 public static String getSystemId(Resource resource) {
57 try {
58 return new URI(resource.getURL().toExternalForm()).toString();
59 }
60 catch (IOException ex) {
61 logger.debug("Could not get System ID from [" + resource + "], ex");
62 return null;
63 }
64 catch (URISyntaxException e) {
65 logger.debug("Could not get System ID from [" + resource + "], ex");
66 return null;
67 }
68 }
69
70 }