1 /*
2 * Copyright 2006 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.xml.sax.InputSource;
24
25 import org.springframework.core.io.Resource;
26
27 /**
28 * Convenient utility methods for dealing with SAX.
29 *
30 * @author Arjen Poutsma
31 * @since 1.0.0
32 */
33 public abstract class SaxUtils {
34
35 /**
36 * Creates a SAX <code>InputSource</code> from the given resource. Sets the system identifier to the resource's
37 * <code>URL</code>, if available.
38 *
39 * @param resource the resource
40 * @return the input source created from the resource
41 * @throws IOException if an I/O exception occurs
42 * @see InputSource#setSystemId(String)
43 * @see #getSystemId(org.springframework.core.io.Resource)
44 */
45 public static InputSource createInputSource(Resource resource) throws IOException {
46 InputSource inputSource = new InputSource(resource.getInputStream());
47 inputSource.setSystemId(getSystemId(resource));
48 return inputSource;
49 }
50
51 /** Retrieves the URL from the given resource as System ID. Returns <code>null</code> if it cannot be opened. */
52 public static String getSystemId(Resource resource) {
53 try {
54 return new URI(resource.getURL().toExternalForm()).toString();
55 }
56 catch (IOException e) {
57 return null;
58 }
59 catch (URISyntaxException e) {
60 return null;
61 }
62 }
63
64 }