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//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util.ajax;
import java.lang.reflect.Method;
import java.util.Map;
import org.eclipse.jetty.util.Loader;
import org.eclipse.jetty.util.ajax.JSON.Output;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
/**
* 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.
*
*
*/
public class JSONEnumConvertor implements JSON.Convertor
{
private static final Logger LOG = Log.getLogger(JSONEnumConvertor.class);
private boolean _fromJSON;
private Method _valueOf;
{
try
{
Class<?> e = Loader.loadClass(getClass(),"java.lang.Enum");
_valueOf=e.getMethod("valueOf",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,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",((Enum)obj).name());
}
else
{
out.add(((Enum)obj).name());
}
}
}
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