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package org.apache.commons.beanutils;

import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.Map;

import com.google.common.base.Throwables;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.MoreObjects.firstNonNull;

/**
 * 实现对{@link Map}实例的属性封装
 * @author guyadong
 *
 */
public class MapPropertyDescriptor extends PropertyDescriptor implements MorePropertyDescriptor {

	private final Method readMethod;
	private final Method writeMethod;
	private final Class propertyType;
	public MapPropertyDescriptor(Class propertyType, String name)
			throws IntrospectionException {
		/** 将属性名中的.替换为_,以避免对nested name解析出错 */
		super(checkNotNull(name,"field is null").replace(".", "_"), null, null);
		setDisplayName(name);
		this.propertyType = firstNonNull(propertyType, Object.class);
		try {
			readMethod = MapPropertyDescriptor.class.getMethod("readMethod", Object.class,String.class);
			writeMethod = MapPropertyDescriptor.class.getMethod("writeMethod", Object.class,String.class,Object.class);
		} catch (Exception e) {
			Throwables.throwIfUnchecked(e);
			throw new RuntimeException(e);
		}
	}

	/**
	 * 字段读取方法实现
	 * @param bean 读取目标对象
	 * @param name 字段名
	 * @return 字段值
	 */
	@SuppressWarnings("rawtypes")
	public static Object readMethod(Object bean,String name){
		if(bean instanceof Map){
			return ((Map)bean).get(name);
		}
		return null;		
	}
	/**
	 * 字段写入方法实现
	 * @param bean 写入目标对象
	 * @param name 字段名
	 * @param value 要写入的值
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public static void writeMethod(Object bean,String name,Object value){
		if(bean instanceof Map){
			((Map)bean).put(name, value);
		}
	}

	@Override
	public Method getReadMethod() {
		return readMethod;
	}

	@Override
	public Method getWriteMethod() {
		return writeMethod;
	}

	@Override
	public Class getPropertyType() {
		return propertyType;
	}
	
}