org.springframework.webflow.builder.WebFlowDtdResolver Maven / Gradle / Ivy
/*
* Copyright 2002-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.webflow.builder;
import java.io.IOException;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
/**
* EntityResolver implementation for the Spring Web Flow 1.0 DTD, to load the
* DTD from the classpath. The implementation is similar to that of the
* org.springframework.beans.factory.xml.BeansDtdResolver.
*
* The doctype of the DTD expected to be resolved:
*
*
* <!DOCTYPE flow PUBLIC "-//SPRING//DTD WEBFLOW 1.0//EN"
* "http://www.springframework.org/dtd/spring-webflow-1.0.dtd">
*
*
* @see org.springframework.webflow.builder.XmlFlowBuilder
*
* @author Erwin Vervaet
*/
public class WebFlowDtdResolver implements EntityResolver {
private static final String WEBFLOW_ELEMENT = "spring-webflow-1.0";
public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
if (systemId != null && systemId.indexOf(WEBFLOW_ELEMENT) > systemId.lastIndexOf("/")) {
String dtdFilename = systemId.substring(systemId.indexOf(WEBFLOW_ELEMENT));
try {
Resource resource = new ClassPathResource(dtdFilename, getClass());
InputSource source = new InputSource(resource.getInputStream());
source.setPublicId(publicId);
source.setSystemId(systemId);
return source;
}
catch (IOException ex) {
// fall through below
}
}
// let the parser handle it
return null;
}
}