xmlnodebuilder.java

一款即时通讯软件

package edu.ou.kmi.buddyspace.xml;

import java.io.Serializable;
import java.util.*;
import org.jabber.jabberbeans.util.*;
import org.jabber.jabberbeans.*;
import org.jabber.jabberbeans.Extension.*;
import org.xml.sax.AttributeList;
import org.xml.sax.helpers.AttributeListImpl;


/*
 * An <code>XMLNodeBuilder</code> is used to generate a generic XMLNode
 * object.
 */

public class XMLNodeBuilder implements ExtensionBuilder
{
	/** XML base element name*/
        private String name;

        /** XML base element attributes (including namespace) */
        private AttributeList attributes;

        /** XML subnodes - including text parts (Strings) */
        private Vector children;

	/*
	 * Construct a new <code>XMLNodeBuilder</code> object 
	 */
	public XMLNodeBuilder()
	{reset();}

	/** reset this builder to a default state, for reuse */
	public void reset()
	{
		name = null;
		attributes = null;
		children = new Vector();
	}
	
	
        /* return the name */
	public String getName() {
            return name;
        }
        
        /* sets name */
        public void setName(String name) {
            this.name = name;
        }
        
        /* return the xmlns */
	public String getNamespace() {
            return (attributes == null)? null : attributes.getValue("xmlns");
        }
        
        /* sets xmlns */
        /*public void setNamespace(String xmlns) {
            this.xmlns = xmlns;
        }*/
        
        /* return the attributes */
	public AttributeList getAttributes() {
            return attributes;
        }
        
        /* sets attributes */
        public void setAttributes(AttributeList attributes) {
            this.attributes = new AttributeListImpl(attributes);
        }
        
        /* returns all text concatenated into one string */
	public String getCharacters() {
            if (children == null) return null;
            StringBuffer characters = new StringBuffer();
            Enumeration chEnum = children.elements();
            while (chEnum.hasMoreElements()) {
                Object o = chEnum.nextElement();
                if (o instanceof String) {
                    characters.append((String)o);
                }
            }
            return characters.toString();
        }
        
        /* sets characters */
        public void addCharacters(String characters) {
            if (characters != null && characters.length() != 0)
                children.add(characters);
        }
                        
	/* return the children */
	public Vector getChildren() {
            return children;
        }
	
	/* adds the child */
	public void addChild(XMLData child) {
            if (child != null /*&& !children.contains(child)*/)
                children.add(child);
        }
        
        /* removes the child */
	/*public void removeChild(XMLData child) {
            children.remove(child);
        }*/

	
	/*
	 * Build a <code>XMLNode</code> based on the current builder
	 * state.
	 *
	 * @return <code>XMLNode</code> based on the current builder
	 * state.
	 */
	public Extension build() throws InstantiationException
	{return new XMLNode(this);}
}