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

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Here is the source code for nl.tue.gale.ae.processor.xmlmodule.ObjectModule.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/>.
    
 */
/**
 * ObjectModule.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.net.URL;
import java.util.Arrays;
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 nl.tue.gale.common.uri.URI;
import nl.tue.gale.common.uri.URIs;

import org.dom4j.Element;

public class ObjectModule 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;
    }

    public Element traverse(Element element, Resource resource) throws ProcessorException {
        try {
            GaleContext gc = GaleContext.of(resource);
            processor.traverseChildren(element, resource);
            Element xml = null;
            if (getDepth(resource) > MAX_DEPTH)
                throw new IllegalArgumentException(
                        "maximum object inclusion reached (possible recursion detected)");
            if (element.attributeValue("data") != null) {
                if (element.attributeValue("data").trim().equals(""))
                    throw new IllegalArgumentException("object inclusion with empty 'data' attribute");
                URI orgURI = URIs.of(resource.get("original-url").toString());
                URI uri = orgURI.resolve(element.attributeValue("data"));
                URL location = GaleUtil.generateURL(uri.toString(), gc.gc().getHomeDir());
                resource.put("original-url", uri.toString());
                String orgMime = gc.mime();
                resource.put("mime", GaleUtil.getMime(location.toString()));
                String orgObject = (String) resource.get("nl.tue.gale.object");
                resource.put("nl.tue.gale.object", "true");
                xml = GaleUtil.parseXML(location).getRootElement();
                Element root = GaleUtil.createNSElement("root", "");
                root.add(xml);
                incDepth(resource);
                processor.traverse(root, resource);
                decDepth(resource);
                xml = (Element) root.elements().get(0);
                resource.put("mime", orgMime);
                resource.put("original-url", orgURI.toString());
                if (orgObject == null)
                    resource.remove("nl.tue.gale.object");
                else
                    resource.put("nl.tue.gale.object", orgObject);
            } else if (element.attributeValue("name") != null) {
                URI objectURI = gc.conceptUri().resolve(element.attributeValue("name"));
                URL url = new URL(GaleUtil.getContextURL(gc.req()).toString() + "/concept/" + objectURI.toString());
                objectURI = URIs.builder().uri(objectURI).query(null).build();
                Resource objectResource = gc.pm().createResource(GaleUtil.wrappedRequest(gc.req(), url),
                        GaleUtil.wrappedResponse(gc.resp()));
                objectResource.put("nl.tue.gale.userUri", gc.userUri());
                objectResource.put("nl.tue.gale.conceptUri", objectURI);
                objectResource.put("nl.tue.gale.parentConceptUri", gc.conceptUri());
                objectResource.put("nl.tue.gale.object", "true");
                objectResource.setUsed("response");
                setDepth(objectResource, getDepth(resource) + 1);

                gc.pm().processResource(objectResource);
                if (GaleContext.resp(objectResource).getBufferSize() != 0)
                    throw new IllegalArgumentException("object not found");
                xml = GaleContext.xml(objectResource);
            }
            GaleUtil.replaceNode(element, xml);
            return null;
        } catch (Exception e) {
            e.printStackTrace();
            return (Element) GaleUtil.replaceNode(element, GaleUtil.createErrorElement("[" + e.getMessage() + "]"));
        }
    }

    private static final String DEPTH_KEY = "nl.tue.gale.ae.processor.module.ObjectModule.depth";
    private static final int MAX_DEPTH = 10;

    private void incDepth(Resource resource) {
        setDepth(resource, getDepth(resource) + 1);
    }

    private void decDepth(Resource resource) {
        setDepth(resource, getDepth(resource) - 1);
    }

    private int getDepth(Resource resource) {
        if (resource == null)
            return 0;
        String depthString = (String) resource.get(DEPTH_KEY);
        if (depthString == null)
            return 0;
        return Integer.parseInt(depthString);
    }

    private void setDepth(Resource resource, int depth) {
        if (resource == null)
            return;
        resource.put(DEPTH_KEY, Integer.toString(depth));
    }
}