java 模拟动态对象

 

 

package org.zero.base;

import java.util.HashMap;
import java.util.Map;

public class DynamicObject {
	private Map<String, Object> atts = null;
	private Map<String, IDynamicMethod> methods = null;
	private Object parent = null;

	public DynamicObject(Object obj) {
		super();
		parent = obj;
	}

	public DynamicObject() {
		super();
	}

	public void addAttribute(String name, Object value) {
		if (atts == null)
			atts = new HashMap<String, Object>();
		atts.put(name, value);
	}

	public Object removeAttribute(Object key) {
		if (atts == null)
			return null;
		return atts.remove(key);
	}

	public boolean hasAttribute(String name) {
		if (atts == null)
			return false;
		return atts.containsKey(name);
	}

	public void clear() {
		if (atts != null)
			atts.clear();
		if (methods != null)
			methods.clear();
	}

	public Object getAttribute(Object key) {
		if (atts == null)
			return false;
		return atts.get(key);
	}

	public Object getParent() {
		return parent;
	}

	public void setParent(Object parent) {
		this.parent = parent;
	}

	public void addMethod(String name, IDynamicMethod method) {
		if (methods == null)
			methods = new HashMap<String, IDynamicMethod>();
		methods.put(name, method);
	}

	public void removeMethod(String name) {
		if (methods != null)
			methods.remove(name);
	}

	public boolean hasMethod(String name) {
		return methods.containsKey(name);
	}

	public void invoke(String methodName, Object... args) {
		if (methods != null)
			methods.get(methodName).execute(this, args);
	}

	public Map<String, IDynamicMethod> getAppendMehods() {
		return methods;
	}

	public Map<String, Object> getAppendAtts() {
		return atts;
	}

	public static interface IDynamicMethod {
		public void execute(DynamicObject obj, Object... args);
	}

	public static void main(String[] args) {
		DynamicObject o = new DynamicObject();
		o.addAttribute("name", "hwp");
		o.addMethod("move", new IDynamicMethod() {
			@Override
			public void execute(DynamicObject obj, Object... args) {
				System.out.println("动态添加的方法被执行。。。");
			}
		});
		if (o.hasMethod("move"))
			o.invoke("move");
		if (o.hasAttribute("name"))
			System.out.println(o.getAttribute("name"));
	}
}