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annotate src/org/eclipse/jetty/util/DateCache.java @ 840:0f53601ea489

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 14:20:18 -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;
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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.TimeZone;
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26
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27 /* ------------------------------------------------------------ */
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28 /** Date Format Cache.
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29 * Computes String representations of Dates and caches
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30 * the results so that subsequent requests within the same minute
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31 * will be fast.
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32 *
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33 * Only format strings that contain either "ss" or "ss.SSS" are
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34 * handled.
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35 *
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36 * The timezone of the date may be included as an ID with the "zzz"
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37 * format string or as an offset with the "ZZZ" format string.
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38 *
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39 * If consecutive calls are frequently very different, then this
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40 * may be a little slower than a normal DateFormat.
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41 *
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42 *
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43 *
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44 */
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45
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46 public class DateCache
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47 {
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48 public static String DEFAULT_FORMAT="EEE MMM dd HH:mm:ss zzz yyyy";
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49 private static long __hitWindow=60*60;
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50
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51 private String _formatString;
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52 private String _tzFormatString;
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53 private SimpleDateFormat _tzFormat;
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54
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55 private String _minFormatString;
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56 private SimpleDateFormat _minFormat;
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57
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58 private String _secFormatString;
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59 private String _secFormatString0;
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60 private String _secFormatString1;
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61
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62 private long _lastMinutes = -1;
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63 private long _lastSeconds = -1;
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64 private int _lastMs = -1;
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65 private String _lastResult = null;
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66
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67 private Locale _locale = null;
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68 private DateFormatSymbols _dfs = null;
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69
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70 /* ------------------------------------------------------------ */
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71 /** Constructor.
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72 * Make a DateCache that will use a default format. The default format
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73 * generates the same results as Date.toString().
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74 */
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75 public DateCache()
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76 {
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77 this(DEFAULT_FORMAT);
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78 getFormat().setTimeZone(TimeZone.getDefault());
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79 }
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80
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81 /* ------------------------------------------------------------ */
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82 /** Constructor.
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83 * Make a DateCache that will use the given format
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84 */
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85 public DateCache(String format)
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86 {
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87 _formatString=format;
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88 setTimeZone(TimeZone.getDefault());
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89
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90 }
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91
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92 /* ------------------------------------------------------------ */
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93 public DateCache(String format,Locale l)
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94 {
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95 _formatString=format;
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96 _locale = l;
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97 setTimeZone(TimeZone.getDefault());
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98 }
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99
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100 /* ------------------------------------------------------------ */
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101 public DateCache(String format,DateFormatSymbols s)
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102 {
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103 _formatString=format;
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104 _dfs = s;
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105 setTimeZone(TimeZone.getDefault());
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106 }
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107
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108 /* ------------------------------------------------------------ */
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109 /** Set the timezone.
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110 * @param tz TimeZone
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111 */
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112 public synchronized void setTimeZone(TimeZone tz)
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113 {
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114 setTzFormatString(tz);
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115 if( _locale != null )
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116 {
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117 _tzFormat=new SimpleDateFormat(_tzFormatString,_locale);
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118 _minFormat=new SimpleDateFormat(_minFormatString,_locale);
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119 }
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120 else if( _dfs != null )
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121 {
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122 _tzFormat=new SimpleDateFormat(_tzFormatString,_dfs);
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123 _minFormat=new SimpleDateFormat(_minFormatString,_dfs);
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124 }
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125 else
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126 {
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127 _tzFormat=new SimpleDateFormat(_tzFormatString);
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128 _minFormat=new SimpleDateFormat(_minFormatString);
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129 }
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130 _tzFormat.setTimeZone(tz);
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131 _minFormat.setTimeZone(tz);
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132 _lastSeconds=-1;
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133 _lastMinutes=-1;
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134 }
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135
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136 /* ------------------------------------------------------------ */
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137 public TimeZone getTimeZone()
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138 {
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139 return _tzFormat.getTimeZone();
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140 }
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141
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142 /* ------------------------------------------------------------ */
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143 /** Set the timezone.
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144 * @param timeZoneId TimeZoneId the ID of the zone as used by
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145 * TimeZone.getTimeZone(id)
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146 */
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147 public void setTimeZoneID(String timeZoneId)
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148 {
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149 setTimeZone(TimeZone.getTimeZone(timeZoneId));
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150 }
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151
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152 /* ------------------------------------------------------------ */
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153 private synchronized void setTzFormatString(final TimeZone tz )
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154 {
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155 int zIndex = _formatString.indexOf( "ZZZ" );
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156 if( zIndex >= 0 )
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157 {
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158 String ss1 = _formatString.substring( 0, zIndex );
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159 String ss2 = _formatString.substring( zIndex+3 );
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160 int tzOffset = tz.getRawOffset();
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161
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162 StringBuilder sb = new StringBuilder(_formatString.length()+10);
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163 sb.append(ss1);
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164 sb.append("'");
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165 if( tzOffset >= 0 )
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166 sb.append( '+' );
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167 else
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168 {
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169 tzOffset = -tzOffset;
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170 sb.append( '-' );
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171 }
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172
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173 int raw = tzOffset / (1000*60); // Convert to seconds
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174 int hr = raw / 60;
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175 int min = raw % 60;
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176
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177 if( hr < 10 )
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178 sb.append( '0' );
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179 sb.append( hr );
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180 if( min < 10 )
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181 sb.append( '0' );
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182 sb.append( min );
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183 sb.append( '\'' );
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184
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185 sb.append(ss2);
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186 _tzFormatString=sb.toString();
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187 }
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188 else
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189 _tzFormatString=_formatString;
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190 setMinFormatString();
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191 }
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192
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193
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194 /* ------------------------------------------------------------ */
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195 private void setMinFormatString()
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196 {
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197 int i = _tzFormatString.indexOf("ss.SSS");
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198 int l = 6;
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199 if (i>=0)
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200 throw new IllegalStateException("ms not supported");
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201 i = _tzFormatString.indexOf("ss");
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202 l=2;
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203
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204 // Build a formatter that formats a second format string
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205 String ss1=_tzFormatString.substring(0,i);
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206 String ss2=_tzFormatString.substring(i+l);
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207 _minFormatString =ss1+"'ss'"+ss2;
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208 }
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209
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210 /* ------------------------------------------------------------ */
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211 /** Format a date according to our stored formatter.
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212 * @param inDate
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213 * @return Formatted date
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214 */
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215 public synchronized String format(Date inDate)
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216 {
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217 return format(inDate.getTime());
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218 }
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219
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220 /* ------------------------------------------------------------ */
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221 /** Format a date according to our stored formatter.
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222 * @param inDate
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223 * @return Formatted date
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224 */
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225 public synchronized String format(long inDate)
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226 {
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227 long seconds = inDate / 1000;
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228
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229 // Is it not suitable to cache?
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230 if (seconds<_lastSeconds ||
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231 _lastSeconds>0 && seconds>_lastSeconds+__hitWindow)
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232 {
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233 // It's a cache miss
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234 Date d = new Date(inDate);
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235 return _tzFormat.format(d);
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236
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237 }
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238
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239 // Check if we are in the same second
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240 // and don't care about millis
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241 if (_lastSeconds==seconds )
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242 return _lastResult;
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243
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244 Date d = new Date(inDate);
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245
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246 // Check if we need a new format string
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247 long minutes = seconds/60;
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248 if (_lastMinutes != minutes)
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249 {
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250 _lastMinutes = minutes;
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251 _secFormatString=_minFormat.format(d);
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252
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253 int i=_secFormatString.indexOf("ss");
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254 int l=2;
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255 _secFormatString0=_secFormatString.substring(0,i);
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256 _secFormatString1=_secFormatString.substring(i+l);
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257 }
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258
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259 // Always format if we get here
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260 _lastSeconds = seconds;
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261 StringBuilder sb=new StringBuilder(_secFormatString.length());
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262 sb.append(_secFormatString0);
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263 int s=(int)(seconds%60);
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264 if (s<10)
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265 sb.append('0');
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266 sb.append(s);
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267 sb.append(_secFormatString1);
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268 _lastResult=sb.toString();
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269
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270
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271 return _lastResult;
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272 }
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273
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274 /* ------------------------------------------------------------ */
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275 /** Format to string buffer.
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276 * @param inDate Date the format
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277 * @param buffer StringBuilder
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278 */
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279 public void format(long inDate, StringBuilder buffer)
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280 {
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281 buffer.append(format(inDate));
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282 }
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283
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284 /* ------------------------------------------------------------ */
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285 /** Get the format.
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286 */
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287 public SimpleDateFormat getFormat()
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288 {
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289 return _minFormat;
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290 }
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291
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292 /* ------------------------------------------------------------ */
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293 public String getFormatString()
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294 {
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295 return _formatString;
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296 }
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297
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298 /* ------------------------------------------------------------ */
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299 public String now()
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300 {
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301 long now=System.currentTimeMillis();
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302 _lastMs=(int)(now%1000);
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303 return format(now);
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304 }
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305
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306 /* ------------------------------------------------------------ */
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307 public int lastMs()
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308 {
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309 return _lastMs;
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310 }
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311 }