nl.tue.gale.ae.processor.xmlmodule.IfModule.java Source code

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Here is the source code for nl.tue.gale.ae.processor.xmlmodule.IfModule.java

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/*
    
   This file is part of GALE (Generic Adaptation Language and Engine).
    
GALE is free software: you can redistribute it and/or modify it under the 
terms of the GNU Lesser General Public License as published by the Free 
Software Foundation, either version 3 of the License, or (at your option) 
any later version.
    
GALE 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 Lesser General Public License for 
more details.
    
You should have received a copy of the GNU Lesser General Public License
along with GALE. If not, see <http://www.gnu.org/licenses/>.
    
 */
/**
 * IfModule.java
 * Last modified: $Date$
 * In revision:   $Revision$
 * Modified by:   $Author$
 *
 * Copyright (c) 2008-2011 Eindhoven University of Technology.
 * All Rights Reserved.
 *
 * This software is proprietary information of the Eindhoven University
 * of Technology. It may be used according to the GNU LGPL license.
 */
package nl.tue.gale.ae.processor.xmlmodule;

import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

import nl.tue.gale.ae.GaleContext;
import nl.tue.gale.ae.ProcessorException;
import nl.tue.gale.ae.Resource;
import nl.tue.gale.common.GaleUtil;

import org.dom4j.Element;
import org.dom4j.Node;

public class IfModule extends AbstractModule {
    private List<String> mimeToHandle = Arrays
            .asList(new String[] { "text/xhtml", "text/xml", "application/xml", "application/smil" });

    public List<String> getMimeToHandle() {
        return mimeToHandle;
    }

    public void setMimeToHandle(List<String> mimeToHandle) {
        this.mimeToHandle = mimeToHandle;
    }

    @SuppressWarnings("unchecked")
    public Element traverse(Element element, Resource resource) throws ProcessorException {
        try {
            GaleContext gale = GaleContext.of(resource);
            String expr = element.attributeValue("expr");
            Element block = null;
            List<Element> blocks = new LinkedList<Element>();
            blocks.addAll(element.elements("block"));
            if (element.element("then") != null)
                blocks.add(element.element("then"));
            if (element.element("else") != null)
                blocks.add(element.element("else"));
            if (blocks.size() == 0)
                blocks.add(element);
            if (((Boolean) gale.eval(expr)).booleanValue())
                block = (Element) blocks.get(0);
            else if (blocks.size() > 1)
                block = (Element) blocks.get(1);
            if (block == null) {
                element.detach();
                return null;
            }
            processor.traverseChildren(block, resource);
            List<Node> content = (List<Node>) element.getParent().content();
            int index = content.indexOf(element);
            for (Node node : (List<Node>) block.content()) {
                content.add(index, node);
                index++;
            }
            content.remove(element);
            return null;
        } catch (Exception e) {
            e.printStackTrace();
            return (Element) GaleUtil.replaceNode(element, GaleUtil.createErrorElement("[" + e.getMessage() + "]"));
        }
    }
}