source: trunk/greenstone3-extensions/gs3build/src/org/greenstone/gsdl3/gs3build/metadata/GSDL3Namespace.java@ 12188

package org.greenstone.gsdl3.gs3build.metadata;

import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.ArrayList;
import java.util.HashMap;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;

import org.greenstone.gsdl3.gs3build.util.MultiMap;
import org.greenstone.gsdl3.gs3build.util.XMLTools;

/**
 *  Implement a simple, unordered, namespace in METS.
 *
 *  @see: org.greenstone.gsdl3.gs3build.metadata.METSNamespace
 */

public class GSDL3Namespace extends SimpleNamespace
{
    public static String GSDL3_NAMESPACE_ID = "gsdl3";
    private static String GSDL3_METADATA_TAG = "Metadata";
    
    public GSDL3Namespace()
    { 
    super(GSDL3_NAMESPACE_ID);
    }
    
    public GSDL3Namespace(METSLocation location)
    { 
    super(GSDL3_NAMESPACE_ID, location);
    }
    
    public GSDL3Namespace(Element mdWrapTag)
    {   
    super(GSDL3_NAMESPACE_ID);
    
    NodeList childNodes = mdWrapTag.getChildNodes();
    for (int c = 0; c < childNodes.getLength(); c ++){
        // a metadata node
        if (childNodes.item(c).getNodeType() == org.w3c.dom.Node.ELEMENT_NODE){
        String metadataLabel = childNodes.item(c).getNodeName();

        // cull any leading "GSDL3" tag and its colon...
        if (metadataLabel.startsWith(GSDL3_NAMESPACE_ID + ":")){
            metadataLabel = metadataLabel.substring(this.name.length() + 1);
        }
        
        // TODO: throw error: bad metadata type
        if (metadataLabel.equals(GSDL3_METADATA_TAG) == false){
            continue;
        }
        
        // Get the label - if the name isn't set, abort.
        // TODO: throw error: incomplete metadata tag
        metadataLabel = ((Element) childNodes.item(c)).getAttribute("name");
        if (metadataLabel == null) {
            continue;
        }
        
        // now build the associated value.
        String metadataValue = "";
        
        Element childElement = (Element) childNodes.item(c);
        for (int i = 0; i < childElement.getChildNodes().getLength(); i ++) {
            metadataValue = metadataValue + childElement.getChildNodes().item(i).toString();
        }
        
        this.addMetadata(metadataLabel, metadataValue);
        }
    }
    }
    
    /**
     *  Write out a single element - this may be overloaded to provide for the
     *  appropriate formatting for this metadata.
     */
    protected boolean writeItem(PrintWriter writer, String label)
    {   
    if (this.location == null){
        // just place the metadata in a simple wrapper
        Iterator values = this.metadataMap.getAll(label).iterator();
        
        while (values.hasNext()){
        String tag;
        String value = values.next().toString();
        
        tag = XMLTools.getOpenTag(GSDL3_NAMESPACE_ID, GSDL3_METADATA_TAG);
        tag = XMLTools.addAttribute(tag, "name", label);
        writer.print(tag);
        writer.print(value);
        
        writer.println(XMLTools.getCloseTag(this.name, GSDL3_METADATA_TAG));
        }
    }
    else {
        String tag = XMLTools.getOpenTag("mets", "mdRef");
        tag = XMLTools.addAttribute(tag, "LOCTYPE", this.location.getType());
        tag = XMLTools.addAttribute(tag, "xlink:href", this.location.getLocation().toString());
        tag = XMLTools.addAttribute(tag, "MDTYPE", this.getName());
        tag = XMLTools.makeSingleton(tag);
        writer.println(tag);
    }
    return true;
    }
}