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1
28
29 package com.caucho.jstl.el;
30
31 import com.caucho.el.Expr;
32 import com.caucho.jsp.PageContextImpl;
33 import com.caucho.util.L10N;
34
35 import javax.el.ELContext;
36 import javax.el.ELException;
37 import javax.servlet.jsp.JspException  ;
38 import javax.servlet.jsp.JspWriter ;
39 import javax.servlet.jsp.jstl.core.Config;
40 import javax.servlet.jsp.tagext.BodyTagSupport ;
41 import java.text.DateFormat ;
42 import java.text.SimpleDateFormat ;
43 import java.util.Date ;
44 import java.util.Locale ;
45 import java.util.TimeZone ;
46
47
50 public class FormatDateTag extends BodyTagSupport {
51 private static L10N L = new L10N(FormatDateTag.class);
52
53 private Expr _valueExpr;
54
55 private Expr _typeExpr;
56 private Expr _dateStyleExpr;
57 private Expr _timeStyleExpr;
58
59 private Expr _patternExpr;
60 private Expr _timeZoneExpr;
61
62 private String _var;
63 private String _scope;
64
65
70 public void setValue(Expr value)
71 {
72 _valueExpr = value;
73 }
74
75
80 public void setType(Expr type)
81 {
82 _typeExpr = type;
83 }
84
85
90 public void setDateStyle(Expr style)
91 {
92 _dateStyleExpr = style;
93 }
94
95
100 public void setTimeStyle(Expr style)
101 {
102 _timeStyleExpr = style;
103 }
104
105
110 public void setPattern(Expr pattern)
111 {
112 _patternExpr = pattern;
113 }
114
115
120 public void setTimeZone(Expr zone)
121 {
122 _timeZoneExpr = zone;
123 }
124
125
130 public void setVar(String var)
131 {
132 _var = var;
133 }
134
135
140 public void setScope(String scope)
141 {
142 _scope = scope;
143 }
144
145
148 public int doEndTag()
149 throws JspException
150 {
151 try {
152 PageContextImpl pageContext = (PageContextImpl) this.pageContext;
153
154 JspWriter out = pageContext.getOut();
155
156 Object value = _valueExpr.evalObject(pageContext.getELContext());
157
158 if (value == null) {
159 if (_var != null)
160 CoreSetTag.setValue(pageContext, _var, _scope, null);
161
162 return EVAL_PAGE;
163 }
164
165 long time = 0;
166
167 if (value instanceof Number )
168 time = ((Number ) value).longValue();
169 else if (value instanceof Date )
170 time = ((Date ) value).getTime();
171
172 DateFormat format = null;
173
174 Locale locale = pageContext.getLocale();
175
176 String type = null;
177
178 ELContext env = pageContext.getELContext();
179
180 if (_typeExpr != null)
181 type = _typeExpr.evalString(env);
182
183 int dateStyle = DateFormat.DEFAULT;
184 if (_dateStyleExpr != null)
185 dateStyle = getDateStyle(_dateStyleExpr.evalString(env));
186
187 int timeStyle = DateFormat.DEFAULT;
188 if (_timeStyleExpr != null)
189 timeStyle = getDateStyle(_timeStyleExpr.evalString(env));
190
191 if (locale != null) {
192 if (type == null || type.equals("date"))
193 format = DateFormat.getDateInstance(dateStyle, locale);
194 else if (type.equals("both"))
195 format = DateFormat.getDateTimeInstance(dateStyle,
196 timeStyle,
197 locale);
198 else if (type.equals("time"))
199 format = DateFormat.getTimeInstance(timeStyle, locale);
200 else
201 throw new JspException (L.l("illegal type `{0}'", type));
202 }
203 else {
204 if (type == null || type.equals("date"))
205 format = DateFormat.getDateInstance(dateStyle);
206 else if (type.equals("both"))
207 format = DateFormat.getDateTimeInstance(dateStyle, timeStyle);
208 else if (type.equals("time"))
209 format = DateFormat.getTimeInstance(timeStyle);
210 else
211 throw new JspException (L.l("illegal type `{0}'", type));
212 }
213
214 if (format != null && _patternExpr != null) {
215 String pattern = _patternExpr.evalString(env);
216 try {
217 ((SimpleDateFormat ) format).applyPattern(pattern);
218 } catch (ClassCastException e) {
219 format = new SimpleDateFormat (pattern, locale);
220 }
221 }
222
223 if (format != null) {
224 TimeZone timeZone = getTimeZone();
225 if (timeZone != null)
226 format.setTimeZone(timeZone);
227 }
228
229 if (format != null)
230 value = format.format(new Date (time));
231
232 if (_var == null)
233 out.print(value);
234 else
235 CoreSetTag.setValue(pageContext, _var, _scope, value);
236 } catch (Exception e) {
237 throw new JspException (e);
238 }
239
240 return EVAL_PAGE;
241 }
242
243 private TimeZone getTimeZone()
244 throws ELException
245 {
246 if (_timeZoneExpr != null) {
247 PageContextImpl pageContext = (PageContextImpl) this.pageContext;
248 Object timeZoneObj = _timeZoneExpr.evalObject(pageContext.getELContext());
249
250 TimeZone zone = getTimeZone(timeZoneObj);
251 if (zone != null)
252 return zone;
253 }
254
255 Object timeZoneObj = pageContext.getAttribute("com.caucho.time-zone");
256
257 if (timeZoneObj != null)
258 return (TimeZone ) timeZoneObj;
259
260 timeZoneObj = Config.find(pageContext, Config.FMT_TIME_ZONE);
261
262 return getTimeZone(timeZoneObj);
263 }
264
265 private TimeZone getTimeZone(Object timeZoneObj)
266 {
267 if (timeZoneObj instanceof TimeZone )
268 return (TimeZone ) timeZoneObj;
269 else if (timeZoneObj instanceof String ) {
270 String timeZoneString = (String ) timeZoneObj;
271
272 return TimeZone.getTimeZone(timeZoneString);
273 }
274
275 return null;
276 }
277
278 public static int getDateStyle(String style)
279 throws JspException
280 {
281 if (style == null || style.equals("default"))
282 return DateFormat.DEFAULT;
283 else if (style.equals("short"))
284 return DateFormat.SHORT;
285 else if (style.equals("medium"))
286 return DateFormat.MEDIUM;
287 else if (style.equals("long"))
288 return DateFormat.LONG;
289 else if (style.equals("full"))
290 return DateFormat.FULL;
291 else
292 throw new JspException (L.l("illegal date style `{0}'", style));
293 }
294 }
295
296 |
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