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annotate src/org/eclipse/jetty/util/ajax/JSONObjectConvertor.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
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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.lang.reflect.Modifier;
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23 import java.util.Arrays;
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24 import java.util.HashSet;
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25 import java.util.Locale;
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26 import java.util.Map;
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27 import java.util.Set;
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28
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29 import org.eclipse.jetty.util.ajax.JSON.Output;
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30
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31 /* ------------------------------------------------------------ */
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32 /**
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33 * Convert an Object to JSON using reflection on getters methods.
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34 *
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35 *
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36 *
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37 */
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38 public class JSONObjectConvertor implements JSON.Convertor
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39 {
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40 private boolean _fromJSON;
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41 private Set _excluded=null;
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42
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43 public JSONObjectConvertor()
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44 {
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45 _fromJSON=false;
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46 }
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47
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48 public JSONObjectConvertor(boolean fromJSON)
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49 {
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50 _fromJSON=fromJSON;
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51 }
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52
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53 /* ------------------------------------------------------------ */
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54 /**
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55 * @param fromJSON
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56 * @param excluded An array of field names to exclude from the conversion
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57 */
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58 public JSONObjectConvertor(boolean fromJSON,String[] excluded)
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59 {
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60 _fromJSON=fromJSON;
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61 if (excluded!=null)
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62 _excluded=new HashSet(Arrays.asList(excluded));
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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 return map;
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70 }
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71
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72 public void toJSON(Object obj, Output out)
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73 {
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74 try
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75 {
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76 Class c=obj.getClass();
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77
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78 if (_fromJSON)
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79 out.addClass(obj.getClass());
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80
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81 Method[] methods = obj.getClass().getMethods();
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82
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83 for (int i=0;i<methods.length;i++)
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84 {
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85 Method m=methods[i];
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86 if (!Modifier.isStatic(m.getModifiers()) &&
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87 m.getParameterTypes().length==0 &&
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88 m.getReturnType()!=null &&
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89 m.getDeclaringClass()!=Object.class)
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90 {
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91 String name=m.getName();
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92 if (name.startsWith("is"))
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93 name=name.substring(2,3).toLowerCase(Locale.ENGLISH)+name.substring(3);
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94 else if (name.startsWith("get"))
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95 name=name.substring(3,4).toLowerCase(Locale.ENGLISH)+name.substring(4);
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96 else
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97 continue;
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98
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99 if (includeField(name,obj,m))
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100 out.add(name, m.invoke(obj,(Object[])null));
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101 }
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102 }
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103 }
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104 catch (Throwable e)
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105 {
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106 throw new IllegalArgumentException(e);
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107 }
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108 }
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109
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110 protected boolean includeField(String name, Object o, Method m)
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111 {
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112 return _excluded==null || !_excluded.contains(name);
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113 }
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114
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115 }