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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 java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.xpath.XPathFunction;
import javax.xml.xpath.XPathFunctionException;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* The SCA-defined XPath function
*/
public class PolicyXPathFunction implements XPathFunction {
private static Logger logger = Logger.getLogger(PolicyXPathFunction.class.getName());
static final QName InterfaceRef = new QName(PolicyConstants.SCA11_NS, "InterfaceRef");
static final QName OperationRef = new QName(PolicyConstants.SCA11_NS, "OperationRef");
static final QName MessageRef = new QName(PolicyConstants.SCA11_NS, "MessageRef");
static final QName IntentRefs = new QName(PolicyConstants.SCA11_NS, "IntentRefs");
static final QName URIRef = new QName(PolicyConstants.SCA11_NS, "URIRef");
static final Set<QName> functions =
new HashSet<QName>(Arrays.asList(InterfaceRef, OperationRef, MessageRef, IntentRefs, URIRef));
private NamespaceContext namespaceContext;
private final QName functionName;
public PolicyXPathFunction(NamespaceContext namespaceContext, QName functionName) {
super();
this.namespaceContext = namespaceContext;
this.functionName = functionName;
}
private Node getContextNode(List args) {
if (args.size() >= 2) {
NodeList nodeList = (NodeList)args.get(1);
if (nodeList.getLength() > 0) {
return nodeList.item(0);
}
}
return null;
}
public Object evaluate(List args) throws XPathFunctionException {
if (logger.isLoggable(Level.FINE)) {
logger.fine(functionName + "(" + args + ")");
}
String arg = (String)args.get(0);
Node node = getContextNode(args);
if (InterfaceRef.equals(functionName)) {
return evaluateInterface(arg, node);
} else if (OperationRef.equals(functionName)) {
String[] params = arg.split("/");
if (params.length != 2) {
throw new IllegalArgumentException("Invalid argument: " + arg);
}
String interfaceName = params[0];
String operationName = params[1];
return evaluateOperation(interfaceName, operationName, node);
} else if (MessageRef.equals(functionName)) {
String[] params = arg.split("/");
if (params.length != 3) {
throw new IllegalArgumentException("Invalid argument: " + arg);
}
String interfaceName = params[0];
String operationName = params[1];
String messageName = params[2];
return evaluateMessage(interfaceName, operationName, messageName, node);
} else if (URIRef.equals(functionName)) {
return evaluateURI(arg, node);
} else if (IntentRefs.equals(functionName)) {
String[] intents = arg.split("(\\s)+");
return evaluateIntents(intents, node);
} else {
return Boolean.FALSE;
}
}
private Boolean evaluateInterface(String interfaceName, Node node) {
return Boolean.FALSE;
}
private Boolean evaluateOperation(String interfaceName, String operationName, Node node) {
return Boolean.FALSE;
}
private Boolean evaluateMessage(String interfaceName, String operationName, String messageName, Node node) {
return Boolean.FALSE;
}
private Boolean evaluateURI(String uri, Node node) {
return Boolean.FALSE;
}
private Boolean evaluateIntents(String[] intents, Node node) {
return Boolean.FALSE;
}
private static Pattern FUNCTION;
static {
String functionPattern = "(URIRef|InterfaceRef|OperationRef|MessageRef|IntentRefs)\\s*\\((.*)\\)";
FUNCTION = Pattern.compile(functionPattern);
}
public static String normalize(String attachTo) {
Matcher matcher = FUNCTION.matcher(attachTo);
boolean result = matcher.find();
if (result) {
StringBuffer sb = new StringBuffer();
do {
String function = matcher.group(1);
String args = matcher.group(2);
String replacement = null;
if (args.trim().length() > 0) {
replacement = function + "(" + args + "," + "self::node())";
} else {
replacement = function + "(self::node())";
}
matcher.appendReplacement(sb, replacement);
result = matcher.find();
} while (result);
matcher.appendTail(sb);
return sb.toString();
}
return attachTo;
}
}
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