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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.sca.policy.xml;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.xpath.XPathFunction;
import javax.xml.xpath.XPathFunctionResolver;
/**
* A resolver that handles SCA-defined XPath functions
*
* Interface Related Functions
* <ul>
* <li>InterfaceRef( InterfaceName )
* <li>OperationRef( InterfaceName/OperationName )
* <li>MessageRef( InterfaceName/OperationName/MessageName )
* </ul>
*
* Intent Related Functions
* <ul>
* <li>IntentRefs( IntentList )
* </ul>
*
* URI Based Function
* <ul>
* <li>URIRef( URI )
* </ul>
*/
public class PolicyXPathFunctionResolver implements XPathFunctionResolver {
private NamespaceContext namespaceContext;
public PolicyXPathFunctionResolver(NamespaceContext namespaceContext) {
super();
this.namespaceContext = namespaceContext;
}
public XPathFunction resolveFunction(QName functionName, int arity) {
if (functionName == null) {
throw new NullPointerException("Function name is null");
}
if (PolicyXPathFunction.functions.contains(functionName)) {
if (arity >= 1) {
// We are relaxing the arity here so that we can pass in the context node
// by modifying the original xpath so that sca functions take self::node()
// as the 2nd argument
return new PolicyXPathFunction(namespaceContext, functionName);
} else {
throw new IllegalArgumentException("Invalid number of arguments: " + arity);
}
}
return null;
}
}
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