MetaDataPropertyList.java

/*
 * Created on Apr 27, 2004
 */
package org.nees.rbnb;

import java.util.Properties;
import java.util.Enumeration;

import java.io.IOException;
import java.io.StringReader;
import java.io.BufferedReader;

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

public class MetaDataPropertyList extends Properties {
    
    static final String PROPERTY_TAG = "metadata-property-list";
    
    public String toXmlString() throws IOException
    {
        Document doc = Xml.createDocument();
        Node node, root = doc.createElement(PROPERTY_TAG);
        Enumeration e = this.keys();
        String key, value;
        while (e.hasMoreElements())
        {
            key = (String) e.nextElement();
            value = this.getProperty(key);
            node = doc.createElement(key);
            node.appendChild(doc.createTextNode(value));
            root.appendChild(node);
        }
        doc.appendChild(root);

        String out = "";
        try
        {
            out = Xml.writeDocumentToString(doc);
        } catch (IOException e1) {
            throw new IOException("MetaDataPropertyList Failed to generate xml string " + e1);
        }
        return out;
    }
    
    public void initializeFromXml(String xml) throws IllegalArgumentException, IOException
    {
        this.clear();
        addFromXml(xml);
    }
    
    public void addFromXml(String xml)
    {
        // convert to doc   
        Document doc = Xml.readDocumentFromString(xml);

        // get the root element
        Element root = doc.getDocumentElement();
        if (!(root.getTagName().equals(PROPERTY_TAG)))
            throw new IllegalArgumentException(
                "XML string does not have root tag with " + PROPERTY_TAG
                + "; found " + root.getTagName() + " instead.");

        // process the children
        NodeList children = root.getChildNodes();
        final int length = children.getLength();
        for(int i = 0; i < length; i++)
        {
            Node child = children.item(i);
            if (child.getNodeType() == Node.ELEMENT_NODE)
            {
                Element element = (Element)child;
                String key = element.getTagName();
                Node textNode = child.getChildNodes().item(0);
                String value = textNode.getNodeValue();
                this.setProperty(key,value);                
            }
        }
    }
}

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