node.java

方便大家也方便自己啊。

/**
 *   Copyright 2004 Carlos Silva A.
 * 
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License. 
 *   You may obtain a copy of the License at  
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 * 
 */
package com.csa.lib.xml.dom;

import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.StringTokenizer;
import java.util.Vector;

import org.xml.sax.AttributeList;

/** 
 * Node implementa un arbol tipo DOM pero NO es DOM.
 * No soporta contenidos mezclados (por ejemplo) ni sub esquemas.
 * 
 * <P>Se uso para utilizar un parser SAX para leer los contenidos de 
 * los archivos XML sin usar Xerces.</p>
 * 
 * <P>Esta basado en MinML (ver licencia en META-INF/)</p>
 * 
 * <p>$Date: 2005/09/16 13:43:44 $</p> 
 * @version $Revision: 1.3 $
 * @author Carlos Silva
 */
public class Node {
	String name;
	StringBuffer value;		
	Hashtable attributes;
	Hashtable attributeTypes;
	Vector childs;
	Node parent = null;
	Node next = null;
	Node prev = null;
	public Node (String name) {
		this.name = name;
	}
	public Node (String name,AttributeList attributes) {
		this.name = name;
		if (attributes.getLength()>0) {
			this.attributes = new Hashtable();
			this.attributeTypes = new Hashtable();
			for (int i = 0; i < attributes.getLength(); i++) {
				this.attributes.put(attributes.getName(i), attributes.getValue(i));
				this.attributeTypes.put(attributes.getName(i), attributes.getType(i));
			}
		}			
	}
	public Node (String name,Hashtable attributes) {
			this.name = name;
			this.attributes = attributes;
	}
	
	public Node (String name,String value) {
		this.name = name;
		if (value!=null)
			this.value = new StringBuffer(value);
	}
	public void setAttribute(String name, String value) {
		if (attributes==null)
			attributes= new Hashtable();
		attributes.put(name,value);
		
	}
	
	public void addValue(String s){
		if (value==null)
			value = new StringBuffer();
		value.append(s);
	}
	public String getValue(){
		if (value==null) return null;
		return value.toString();
	}
	public void appendChild(Node child){
		if (childs==null) 
			childs=new Vector();					
		child.parent=this;
		child.next=null;
		if (childs.size()>0) {
			Node prev = (Node) childs.lastElement();		
			child.prev= prev;
			prev.next=child;
		}
		childs.add(child);
	}
	public void appendChild(String name, String value){
		appendChild(new Node(name, value));
	}
	public Iterator getChildElements(){
		if (childs==null)
			return (new Vector()).iterator();
		return childs.iterator();
	}
	public String getNodeName(){
		return name;
	}
	public Node getParentNode(){
		return parent;
	}
	public Node getNextSibling(){
		return next;
	}
	public Node getPrevSibling(){
		return prev;
	}
	
	public Node getFirstChild(){
		if (childs==null) return null;
		return (Node)childs.firstElement();
	}
	public String getAttribute(String n){
		if (attributes==null) 
			return null;
		return (String) attributes.get(n);
	}
	
	
	Node getChildByName(String name) {
		for (Iterator i = getChildElements(); i.hasNext();) {
			Node c = (Node) i.next();
			if (name.equals(c.getNodeName())) {
				return c;
			}
		}
		return null;
	}
	String getChildText(String name) {
		Node n = getChildByName(name);
		if (n == null)
			return null;
		return n.getValue();
	}
	Node getElementByPath(String path) {
		StringTokenizer st = new StringTokenizer(path, "/");
		Node n = this;
		while (st.hasMoreTokens()) {
			String t = st.nextToken();
			n = n.getChildByName(t);
			if (n == null)
				return null;
		}
		return n;
	}
	String getElementText(String path) {
		Node n = getElementByPath(path);
		return n.getValue();
	}
	
	
	public void show() {
		show(" ");
	}
	void show(String pre) {
		System.out.println(pre+name+": " +getValue());
		if (attributes!=null)
			for (Enumeration e = attributes.keys(); e.hasMoreElements();) {
				String key = (String) e.nextElement();
				String value = (String) attributes.get(key);
				System.out.println(pre+"   @" + key +  "= \"" + value + "\"");
			}
			
		if (childs!=null)
			for (int i =0; i<childs.size();i++){
				((Node) childs.get(i)).show(pre+"  ");
			}
	}		
}