使用SAX方式解析Xml文件

xml 文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<root>
	<structure>
		<name value="Internet Prototal"></name>
		<tiptext>dd</tiptext>
		<member>
			<name value="length"></name>
			<tiptext>ddf</tiptext>
		</member>
		<union>
			<name value="dkdkdk"></name>
			<member>
				<name value="icmp"></name>
				<tiptext>ddf</tiptext>
			</member>
		</union>
	</structure>
	<structure>
		<name value="Internet Version 6"></name>
		<tiptext>dd</tiptext>
		<member>
			<name value="icmp"></name>
			<tiptext>ddf</tiptext>
		</member>
	</structure>
</root>

解析类的ContentHandler

package com.example.rcp.first.xml;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import com.example.rcp.first.model.DefaultXmlNode;
import com.example.rcp.first.model.IXmlNode;
import com.example.rcp.first.model.Jump;
import com.example.rcp.first.model.Member;
import com.example.rcp.first.model.Structure;
import com.example.rcp.first.model.Union;

public class MyContentHandler extends DefaultHandler {
	IXmlNode root = null;

	public IXmlNode getRoot() {
		return root;
	}
	public void setRoot(IXmlNode root) {
		this.root = root;
	}
	IXmlNode parent = null;

	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		if(root == null){
			root = new DefaultXmlNode();
			return;
		}
		DefaultXmlNode cNode = new DefaultXmlNode();
		if("structure".equals(qName)){
			cNode = new Structure();
			if(parent == null){
				root.addChild(cNode);
			}else{
				parent.addChild(cNode);
			}
		}else if("union".equals(qName)){
			cNode = new Union();
			if(parent != null){
				parent.addChild(cNode);
			}
		}else if("member".equals(qName)){
			cNode = new Member();
			if(parent != null){
				parent.addChild(cNode);
			}
		}else if("jump".equals(qName)){
			cNode = new Jump();
			if(parent != null){
				parent.addChild(cNode);
			}
		}else{
			if("name".equals(qName)){
				if(parent!=null){
					parent.setName(attributes.getValue("value"));
				}

			}

		}
		cNode.setParent(parent);
		String pName = parent == null ? "" : (parent.getClass() + "@" + parent.getName());
		//System.out.println("当前结点:" + qName + " 父结点：" + pName);
		parent = cNode;
	}
	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		if(parent != null)
		parent = parent.getParent();
	}

}

RCP视图使用TreeViewer，其内容提供类与标签提供类如下：

	class ViewContentProvider implements IStructuredContentProvider, 
										   ITreeContentProvider {

		public void inputChanged(Viewer v, Object oldInput, Object newInput) {
			System.out.println(newInput);
		}
		public void dispose() {
		}
		public Object[] getElements(Object parent) {
			if(parent instanceof IXmlNode){
				IXmlNode node = (IXmlNode)parent;
				return node.getChildren().toArray();
			}
			else{
				return null;
			}
		}
		public Object getParent(Object child) {
			return null;
		}
		public Object [] getChildren(Object parent) {
			if (parent instanceof IXmlNode) {
				return ((IXmlNode)parent).getChildren().toArray();
			}
			return new Object[0];
		}
		public boolean hasChildren(Object parent) {
			System.out.println(parent.getClass());
			if (parent instanceof IXmlNode){
				List children = ((IXmlNode)parent).getChildren();
				System.out.println(children.isEmpty());
				return !children.isEmpty();
			}
			return false;
		}

	}
	class ViewLabelProvider extends LabelProvider {

		public String getText(Object obj) {
			if(obj instanceof IXmlNode){
				return ((IXmlNode)obj).getName();
			}
			return obj.toString();
		}
		public Image getImage(Object obj) {
			String imageKey = ISharedImages.IMG_OBJ_ELEMENT;
			if (obj instanceof IXmlNode)
			   imageKey = ISharedImages.IMG_OBJ_FOLDER;
			return PlatformUI.getWorkbench().getSharedImages().getImage(imageKey);
		}
	}