| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 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()); |
| } |
| } |
| } |