Source Code Cross Referenced for WebFlowEntityResolver.java in  » Workflow-Engines » spring-webflow-1.0.4 » org » springframework » webflow » engine » builder » xml » Java Source Code / Java DocumentationJava Source Code and Java Documentation

01:        /*
02:         * Copyright 2004-2007 the original author or authors.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *      http://www.apache.org/licenses/LICENSE-2.0
09:         *
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.springframework.webflow.engine.builder.xml;
17:
18:        import java.io.IOException;
19:
20:        import org.springframework.core.io.ClassPathResource;
21:        import org.springframework.core.io.Resource;
22:        import org.xml.sax.EntityResolver;
23:        import org.xml.sax.InputSource;
24:        import org.xml.sax.SAXException;
25:
26:        /**
27:         * EntityResolver implementation for the Spring Web Flow 1.0 XML Schema. This
28:         * will load the XSD from the classpath. 
29:         * <p>
30:         * The xmlns of the XSD expected to be resolved:
31:         * 
32:         * <pre>
33:         *     &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
34:         *     &lt;flow xmlns=&quot;http://www.springframework.org/schema/webflow&quot;
35:         *           xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;
36:         *           xsi:schemaLocation=&quot;http://www.springframework.org/schema/webflow
37:         *                               http://www.springframework.org/schema/webflow/spring-webflow-1.0.xsd&quot;&gt;
38:         * </pre>
39:         * 
40:         * @author Erwin Vervaet
41:         * @author Ben Hale
42:         */
43:        public class WebFlowEntityResolver implements  EntityResolver {
44:
45:            private static final String WEBFLOW_ELEMENT = "spring-webflow-1.0";
46:
47:            public InputSource resolveEntity(String publicId, String systemId)
48:                    throws SAXException, IOException {
49:                if (systemId != null
50:                        && systemId.indexOf(WEBFLOW_ELEMENT) > systemId
51:                                .lastIndexOf("/")) {
52:                    String filename = systemId.substring(systemId
53:                            .indexOf(WEBFLOW_ELEMENT));
54:                    try {
55:                        Resource resource = new ClassPathResource(filename,
56:                                getClass());
57:                        InputSource source = new InputSource(resource
58:                                .getInputStream());
59:                        source.setPublicId(publicId);
60:                        source.setSystemId(systemId);
61:                        return source;
62:                    } catch (IOException ex) {
63:                        // fall through below
64:                    }
65:                }
66:                // let the parser handle it
67:                return null;
68:            }
69:        }