org.fireflow.engine.modules.script.functions.XPath.java Source code

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Here is the source code for org.fireflow.engine.modules.script.functions.XPath.java

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/**
 * Copyright 2007-2010 ?
 * All rights reserved. 
 * 
 * This library is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License v3 as published by the Free Software
 * Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with this library; if not, see http://www.gnu.org/licenses/lgpl.html.
 *
 */
package org.fireflow.engine.modules.script.functions;

import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.apache.commons.jexl2.Expression;
import org.apache.commons.jexl2.JexlContext;
import org.apache.commons.jexl2.JexlEngine;
import org.apache.commons.jexl2.MapContext;
import org.apache.commons.jxpath.JXPathContext;
import org.fireflow.engine.modules.script.ScriptEngineHelper;

/**
 *
 * @author ? nychen2000@163.com
 * Fire Workflow www.firesoa.com  www.fireflow.org
 *
 */
public class XPath {
    //   private static Map<String,String> namespacePrefixUriMap = null;
    public static final String NAMESPACE_PREFIX_URI_MAP = "org.fireflow.contants.NAMESPACE_PREFIX_URI_MAP";
    private JexlContext4Fireflow context = null;

    public XPath(JexlContext ctx) {
        this.context = (JexlContext4Fireflow) ctx;
    }

    public Object getValue(String xpath) {
        Map<String, Object> contextObjects = this.context.getAllContextObject();
        Map<String, String> namespacePrefixUriMap = null;
        if (contextObjects.containsKey(NAMESPACE_PREFIX_URI_MAP)) {
            namespacePrefixUriMap = (Map<String, String>) contextObjects.remove(NAMESPACE_PREFIX_URI_MAP);
        }
        JXPathContext jxpathContext = JXPathContext.newContext(contextObjects);

        if (namespacePrefixUriMap != null) {
            Iterator<String> prefixIterator = namespacePrefixUriMap.keySet().iterator();
            while (prefixIterator.hasNext()) {
                String prefix = prefixIterator.next();
                String nsUri = namespacePrefixUriMap.get(prefix);
                jxpathContext.registerNamespace(prefix, nsUri);
            }
        }
        Object result = jxpathContext.getValue(xpath);
        return result;
    }

    //   public void setValue(Object obj,String xpath){
    //      
    //   }

}