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annotate src/org/eclipse/jetty/util/ajax/JSONDateConvertor.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.text.DateFormatSymbols;
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22 import java.text.SimpleDateFormat;
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23 import java.util.Date;
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24 import java.util.Locale;
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25 import java.util.Map;
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26 import java.util.TimeZone;
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27
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28 import org.eclipse.jetty.util.DateCache;
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29 import org.eclipse.jetty.util.ajax.JSON.Output;
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30 import org.eclipse.jetty.util.log.Log;
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31 import org.eclipse.jetty.util.log.Logger;
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32
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33 /* ------------------------------------------------------------ */
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34 /**
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35 * Convert a {@link Date} to JSON.
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36 * If fromJSON is true in the constructor, the JSON generated will
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37 * be of the form {class="java.util.Date",value="1/1/1970 12:00 GMT"}
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38 * If fromJSON is false, then only the string value of the date is generated.
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39 */
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40 public class JSONDateConvertor implements JSON.Convertor
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41 {
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42 private static final Logger LOG = Log.getLogger(JSONDateConvertor.class);
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43
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44 private final boolean _fromJSON;
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45 private final DateCache _dateCache;
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46 private final SimpleDateFormat _format;
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47
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48 public JSONDateConvertor()
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49 {
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50 this(false);
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51 }
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52
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53 public JSONDateConvertor(boolean fromJSON)
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54 {
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55 this(DateCache.DEFAULT_FORMAT,TimeZone.getTimeZone("GMT"),fromJSON);
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56 }
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57
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58 public JSONDateConvertor(String format,TimeZone zone,boolean fromJSON)
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59 {
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60 _dateCache=new DateCache(format);
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61 _dateCache.setTimeZone(zone);
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62 _fromJSON=fromJSON;
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63 _format=new SimpleDateFormat(format);
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64 _format.setTimeZone(zone);
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65 }
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66
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67 public JSONDateConvertor(String format, TimeZone zone, boolean fromJSON, Locale locale)
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68 {
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69 _dateCache = new DateCache(format, locale);
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70 _dateCache.setTimeZone(zone);
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71 _fromJSON = fromJSON;
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72 _format = new SimpleDateFormat(format, new DateFormatSymbols(locale));
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73 _format.setTimeZone(zone);
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74 }
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75
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76 public Object fromJSON(Map map)
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77 {
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78 if (!_fromJSON)
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79 throw new UnsupportedOperationException();
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80 try
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81 {
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82 synchronized(_format)
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83 {
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84 return _format.parseObject((String)map.get("value"));
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85 }
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86 }
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87 catch(Exception e)
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88 {
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89 LOG.warn(e);
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90 }
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91 return null;
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92 }
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93
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94 public void toJSON(Object obj, Output out)
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95 {
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96 String date = _dateCache.format((Date)obj);
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97 if (_fromJSON)
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98 {
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99 out.addClass(obj.getClass());
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100 out.add("value",date);
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101 }
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102 else
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103 {
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104 out.add(date);
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105 }
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106 }
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107 }