jsonenumconvertor.java

是离开的肌肤了卡机是离开的就富利卡及是了的开发及拉考试及的福利科技阿斯利康的肌肤莱卡及时的离开福建阿斯顿发

//========================================================================
//Copyright 2004-2008 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//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 org.mortbay.util.ajax;

import java.lang.reflect.Method;
import java.util.Map;

import org.mortbay.log.Log;
import org.mortbay.util.Loader;
import org.mortbay.util.ajax.JSON.Output;

/* ------------------------------------------------------------ */
/**
 * Convert an {@link Enum} to JSON.
 * If fromJSON is true in the constructor, the JSON generated will
 * be of the form {class="com.acme.TrafficLight",value="Green"}
 * If fromJSON is false, then only the string value of the enum is generated.
 * @author gregw
 *
 */
public class JSONEnumConvertor implements JSON.Convertor
{
    private boolean _fromJSON;
    private Method _valueOf;
    {
        try
        {
            Class e = Loader.loadClass(getClass(),"java.lang.Enum");
            _valueOf=e.getMethod("valueOf",new Class[]{Class.class,String.class});
        }
        catch(Exception e)
        {
            throw new RuntimeException("!Enums",e);
        }
    }

    public JSONEnumConvertor()
    {
        this(false);
    }
    
    public JSONEnumConvertor(boolean fromJSON)
    {
        _fromJSON=fromJSON;
    }
    
    public Object fromJSON(Map map)
    {
        if (!_fromJSON)
            throw new UnsupportedOperationException();
        try
        {
            Class c=Loader.loadClass(getClass(),(String)map.get("class"));
            return _valueOf.invoke(null,new Object[]{c,map.get("value")});
        }
        catch(Exception e)
        {
            Log.warn(e);  
        }
        return null;
    }

    public void toJSON(Object obj, Output out)
    {
        if (_fromJSON)
        {
            out.addClass(obj.getClass());
            out.add("value",obj.toString());
        }
        else
        {
            out.add(obj.toString());
        }
    }

}