/*
* 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.ode.bpel.elang.xquery10.compiler;
import java.util.ArrayList;
import java.util.List;
import javax.xml.namespace.QName;
import javax.xml.xpath.XPathFunction;
import javax.xml.xpath.XPathFunctionException;
import net.sf.saxon.dom.NodeWrapper;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.Item;
import org.apache.ode.bpel.elang.xpath20.compiler.Constants;
import org.apache.ode.bpel.elang.xpath20.compiler.JaxpFunctionResolver;
import org.apache.ode.utils.Namespaces;
import org.w3c.dom.Node;
/**
* XQuery-Friendly definition of BPEL functions, which
* delegates calls to the JAXP-based function resolver
*/
public class XQuery10BpelFunctions {
public static final String USER_DATA_KEY_FUNCTION_RESOLVER = "function-resolver";
private static final QName WSBPEL_GET_VARIABLE_PROPERTY = new QName(Namespaces.WSBPEL2_0_FINAL_EXEC,
Constants.EXT_FUNCTION_GETVARIABLEPROPERTY);
private static final QName WSBPEL_GET_VARIABLE_DATA = new QName(Namespaces.WSBPEL2_0_FINAL_EXEC,
Constants.EXT_FUNCTION_GETVARIABLEDATA);
private static final QName WSBPEL_GET_LINK_STATUS = new QName(Namespaces.WSBPEL2_0_FINAL_EXEC,
Constants.EXT_FUNCTION_GETLINKSTATUS);
private static final QName WSBPEL_DO_XSL_TRANSFORM = new QName(Namespaces.WSBPEL2_0_FINAL_EXEC,
Constants.EXT_FUNCTION_DOXSLTRANSFORM);
/**
* WS-BPEL getVariableProperty function
*
* @param context context
* @param variableName variableName
* @param propertyName propertyName
*
* @return type
*
* @throws XPathFunctionException XPathFunctionException
*/
public static Object getVariableProperty(XPathContext context,
String variableName, String propertyName) throws XPathFunctionException {
ArrayList<String> arguments = new ArrayList<String>();
arguments.add(variableName);
arguments.add(propertyName);
return evaluate(resolveFunction(context, WSBPEL_GET_VARIABLE_PROPERTY),
arguments);
}
/**
* WS-BPEL getVariableData function
*
* @param context context
* @param variableName variableName
* @param partName partName
* @param xpath xpath
*
* @return type
*
* @throws XPathFunctionException XPathFunctionException
*/
public static Object getVariableData(XPathContext context,
String variableName, String partName, String xpath)
throws XPathFunctionException {
ArrayList<String> arguments = new ArrayList<String>();
arguments.add(variableName);
arguments.add(partName);
arguments.add(xpath);
return evaluate(resolveFunction(context, WSBPEL_GET_VARIABLE_DATA),
arguments);
}
/**
* WS-BPEL doXslTransform function
*
* @param context context
* @param xslUri xslUri
* @param sources sources
*
* @return type
*
* @throws XPathFunctionException XPathFunctionException
*/
public static Object doXslTransform(XPathContext context, String xslUri,
Object sources) throws XPathFunctionException {
ArrayList<Object> arguments = new ArrayList<Object>();
arguments.add(xslUri);
arguments.add(sources);
return evaluate(resolveFunction(context, WSBPEL_DO_XSL_TRANSFORM),
arguments);
}
/**
* WS-BPEL getLinkStatus function
*
* @param context context
* @param linkName linkName
*
* @return type
*
* @throws XPathFunctionException XPathFunctionException
*/
public static Object getLinkStatus(XPathContext context, String linkName)
throws XPathFunctionException {
ArrayList<String> arguments = new ArrayList<String>();
arguments.add(linkName);
return evaluate(resolveFunction(context, WSBPEL_GET_LINK_STATUS),
arguments);
}
/**
* Locates the JAXP equivalent function
*
* @param context context
* @param name name
*
* @return type
*/
private static XPathFunction resolveFunction(XPathContext context,
QName name) {
Item item = context.getCurrentIterator().current();
XPathFunction function = null;
if (item instanceof NodeWrapper) {
Node node = (Node) ((NodeWrapper) item).getUnderlyingNode();
JaxpFunctionResolver funcResolver = null;
if (node != null) {
funcResolver = (JaxpFunctionResolver) node.getUserData(USER_DATA_KEY_FUNCTION_RESOLVER);
}
if (funcResolver != null) {
function = funcResolver.resolveFunction(name, 0);
}
}
return function;
}
/**
* Evaluates function against arguments passed by XQuery
*
* @param function function
* @param arguments arguments
*
* @return type
*
* @throws XPathFunctionException XPathFunctionException
*/
private static Object evaluate(XPathFunction function, List arguments)
throws XPathFunctionException {
if (function == null) {
throw new XPathFunctionException("Unable to locate function in library");
}
return function.evaluate(arguments);
}
}