org.apache.ode.bpel.rtrep.v1.xpath10.jaxp.JaxpVariableResolver.java Source code

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Here is the source code for org.apache.ode.bpel.rtrep.v1.xpath10.jaxp.JaxpVariableResolver.java

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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.ode.bpel.rtrep.v1.xpath10.jaxp;

import javax.xml.namespace.QName;
import javax.xml.xpath.XPathVariableResolver;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ode.bpel.common.FaultException;
import org.apache.ode.bpel.rtrep.v1.EvaluationContext;
import org.apache.ode.bpel.rtrep.v1.OLink;
import org.apache.ode.bpel.rtrep.v1.OMessageVarType;
import org.apache.ode.bpel.rtrep.v1.OScope;
import org.apache.ode.bpel.rtrep.v1.OXsdTypeVarType;
import org.apache.ode.bpel.rtrep.v1.xpath10.OXPath10Expression;
import org.apache.ode.bpel.rtrep.v1.xpath10.OXPath10ExpressionBPEL20;
import org.apache.ode.utils.Namespaces;
import org.apache.ode.utils.xsd.XSTypes;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * JAXP function resolver for BPEL XPath functions
 */
public class JaxpVariableResolver implements XPathVariableResolver {

    private static final Log __log = LogFactory.getLog(JaxpVariableResolver.class);

    private EvaluationContext _ectx;

    private OXPath10Expression _oxpath;

    public JaxpVariableResolver(EvaluationContext ectx, OXPath10Expression oxpath) {
        _ectx = ectx;
        _oxpath = oxpath;
    }

    public Object resolveVariable(QName variableName) {
        __log.debug("JAXP runtime: Resolving variable " + variableName);

        if (!(_oxpath instanceof OXPath10ExpressionBPEL20)) {
            throw new IllegalStateException("XPath variables not supported for bpel 1.1");
        }

        // Custom variables
        if (variableName.getNamespaceURI().equals(Namespaces.ODE_EXTENSION_NS)) {
            if ("pid".equals(variableName.getLocalPart())) {
                return _ectx.getProcessId();
            }
        }

        if (_oxpath instanceof OXPath10ExpressionBPEL20 && ((OXPath10ExpressionBPEL20) _oxpath).isJoinExpression) {
            OLink olink = _oxpath.links.get(variableName.getLocalPart());
            try {
                return _ectx.isLinkActive(olink) ? Boolean.TRUE : Boolean.FALSE;
            } catch (FaultException e) {
                throw new WrappedFaultException(e);
            }
        } else {
            String varName;
            String partName;
            int dotloc = variableName.getLocalPart().indexOf('.');
            if (dotloc == -1) {
                varName = variableName.getLocalPart();
                partName = null;
            } else {
                varName = variableName.getLocalPart().substring(0, dotloc);
                partName = variableName.getLocalPart().substring(dotloc + 1);
            }
            OScope.Variable variable = _oxpath.vars.get(varName);
            OMessageVarType.Part part = partName == null ? null
                    : ((OMessageVarType) variable.type).parts.get(partName);

            try {
                Node variableNode = _ectx.readVariable(variable, part);
                if (variableNode == null)
                    throw new FaultException(variable.getOwner().constants.qnSelectionFailure,
                            "Unknown variable " + variableName.getLocalPart());
                if (_ectx.narrowTypes()) {
                    if (variable.type instanceof OXsdTypeVarType && ((OXsdTypeVarType) variable.type).simple)
                        return getSimpleContent(variableNode, ((OXsdTypeVarType) variable.type).xsdType);
                    if (part != null && part.type instanceof OXsdTypeVarType
                            && ((OXsdTypeVarType) part.type).simple)
                        return getSimpleContent(variableNode, ((OXsdTypeVarType) part.type).xsdType);
                }

                // Saxon expects a node list, this nodelist should contain exactly one item, the attribute
                // value
                return new SingletonNodeList(variableNode);

            } catch (FaultException e) {
                throw new WrappedFaultException(e);
            }
        }
    }

    private Object getSimpleContent(Node simpleNode, QName type) {
        String text = simpleNode.getTextContent();
        try {
            return XSTypes.toJavaObject(type, text);
        } catch (Exception e) {
        }
        // Elegant way failed, trying brute force
        try {
            return Integer.valueOf(text);
        } catch (NumberFormatException e) {
        }
        try {
            return Double.valueOf(text);
        } catch (NumberFormatException e) {
        }
        // Remember: always a node set
        if (simpleNode.getParentNode() != null)
            return simpleNode.getParentNode().getChildNodes();
        else
            return text;
    }

    private static class SingletonNodeList implements NodeList {
        private Node _node;

        SingletonNodeList(Node node) {
            _node = node;
        }

        public Node item(int index) {
            if (index != 0)
                throw new IndexOutOfBoundsException("" + index);
            return _node;
        }

        public int getLength() {
            return 1;
        }

    }
}