/**
* Copyright © 2006-2016 Web Cohesion (info@webcohesion.com)
*
* 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 com.webcohesion.enunciate.modules.jaxb.util;
import freemarker.ext.beans.BeansWrapperBuilder;
import freemarker.template.Configuration;
import freemarker.template.TemplateMethodModelEx;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import java.util.List;
import java.util.Map;
/**
* A method used in templates to output the prefix for a given namespace.
*
* @author Ryan Heaton
*/
public class PrefixMethod implements TemplateMethodModelEx {
private final Map<String, String> namespacePrefixes;
public PrefixMethod(Map<String, String> namespacePrefixes) {
this.namespacePrefixes = namespacePrefixes;
}
/**
* Returns the qname of the element that has the first parameter as the namespace, the second as the element.
*
* @param list The arguments.
* @return The qname.
*/
public Object exec(List list) throws TemplateModelException {
if (list.size() < 1) {
throw new TemplateModelException("The prefix method must have a namespace as a parameter.");
}
Object param1 = list.get(0);
String namespace = param1 instanceof String? (String) param1 : (String) new BeansWrapperBuilder(Configuration.getVersion()).build().unwrap((TemplateModel) param1);
String prefix = lookupPrefix(namespace);
if (prefix == null) {
throw new TemplateModelException("No prefix specified for {" + namespace + "}");
}
return prefix;
}
/**
* Convenience method to lookup a namespace prefix given a namespace.
*
* @param namespace The namespace for which to lookup the prefix.
* @return The namespace prefix.
*/
protected String lookupPrefix(String namespace) {
return this.namespacePrefixes.get(namespace);
}
}