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annotate src/org/eclipse/jetty/util/ajax/JSONEnumConvertor.java @ 803:166b16bda630

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remove org.eclipse.jetty.util.preventers
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 07 Sep 2016 21:21:32 -0600
parents 3428c60d7cfc
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util.ajax;
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20
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21 import java.lang.reflect.Method;
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22 import java.util.Map;
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23
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24 import org.eclipse.jetty.util.Loader;
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25 import org.eclipse.jetty.util.ajax.JSON.Output;
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26 import org.eclipse.jetty.util.log.Log;
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27 import org.eclipse.jetty.util.log.Logger;
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28
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29 /* ------------------------------------------------------------ */
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30 /**
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31 * Convert an {@link Enum} to JSON.
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32 * If fromJSON is true in the constructor, the JSON generated will
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33 * be of the form {class="com.acme.TrafficLight",value="Green"}
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34 * If fromJSON is false, then only the string value of the enum is generated.
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35 *
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36 *
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37 */
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38 public class JSONEnumConvertor implements JSON.Convertor
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39 {
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40 private static final Logger LOG = Log.getLogger(JSONEnumConvertor.class);
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41 private boolean _fromJSON;
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42 private Method _valueOf;
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43 {
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44 try
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45 {
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46 Class<?> e = Loader.loadClass(getClass(),"java.lang.Enum");
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47 _valueOf=e.getMethod("valueOf",Class.class,String.class);
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48 }
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49 catch(Exception e)
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50 {
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51 throw new RuntimeException("!Enums",e);
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52 }
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53 }
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54
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55 public JSONEnumConvertor()
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56 {
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57 this(false);
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58 }
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59
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60 public JSONEnumConvertor(boolean fromJSON)
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61 {
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62 _fromJSON=fromJSON;
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63 }
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64
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65 public Object fromJSON(Map map)
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66 {
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67 if (!_fromJSON)
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68 throw new UnsupportedOperationException();
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69 try
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70 {
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71 Class c=Loader.loadClass(getClass(),(String)map.get("class"));
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72 return _valueOf.invoke(null,c,map.get("value"));
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73 }
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74 catch(Exception e)
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75 {
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76 LOG.warn(e);
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77 }
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78 return null;
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79 }
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80
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81 public void toJSON(Object obj, Output out)
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82 {
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83 if (_fromJSON)
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84 {
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85 out.addClass(obj.getClass());
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86 out.add("value",((Enum)obj).name());
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87 }
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88 else
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89 {
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90 out.add(((Enum)obj).name());
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91 }
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92 }
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93 }