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1
29
30 package com.caucho.jstl.el;
31
32 import com.caucho.el.Expr;
33 import com.caucho.jsp.PageContextImpl;
34 import com.caucho.util.L10N;
35
36 import javax.el.ELContext;
37 import javax.el.ELException;
38 import javax.servlet.jsp.JspException  ;
39 import javax.servlet.jsp.JspWriter ;
40 import javax.servlet.jsp.jstl.core.Config;
41 import javax.servlet.jsp.tagext.BodyTagSupport ;
42 import java.io.IOException ;
43 import java.text.DateFormat ;
44 import java.text.ParseException ;
45 import java.text.SimpleDateFormat ;
46 import java.util.Locale ;
47 import java.util.TimeZone ;
48
49
52 public class ParseDateTag extends BodyTagSupport {
53 private static L10N L = new L10N(ParseDateTag.class);
54
55 private Expr _valueExpr;
56
57 private Expr _typeExpr;
58 private Expr _dateStyleExpr;
59 private Expr _timeStyleExpr;
60
61 private Expr _parseLocaleExpr;
62
63 private Expr _patternExpr;
64 private Expr _timeZoneExpr;
65
66 private String _var;
67 private String _scope;
68
69
74 public void setValue(Expr value)
75 {
76 _valueExpr = value;
77 }
78
79
84 public void setType(Expr type)
85 {
86 _typeExpr = type;
87 }
88
89
94 public void setDateStyle(Expr style)
95 {
96 _dateStyleExpr = style;
97 }
98
99
104 public void setTimeStyle(Expr style)
105 {
106 _timeStyleExpr = style;
107 }
108
109
114 public void setPattern(Expr pattern)
115 {
116 _patternExpr = pattern;
117 }
118
119
124 public void setTimeZone(Expr zone)
125 {
126 _timeZoneExpr = zone;
127 }
128
129
134 public void setParseLocale(Expr locale)
135 {
136 _parseLocaleExpr = locale;
137 }
138
139
144 public void setVar(String var)
145 {
146 _var = var;
147 }
148
149
154 public void setScope(String scope)
155 {
156 _scope = scope;
157 }
158
159
162 public int doEndTag()
163 throws JspException
164 {
165 try {
166 PageContextImpl pageContext = (PageContextImpl) this.pageContext;
167
168 JspWriter out = pageContext.getOut();
169
170 String string;
171
172 if (_valueExpr != null)
173 string = _valueExpr.evalString(pageContext.getELContext());
174 else
175 string = bodyContent.getString().trim();
176
177 DateFormat format = getFormat();
178
179 Object value = format.parse(string);
180
181 if (_var == null)
182 out.print(value);
183 else
184 CoreSetTag.setValue(pageContext, _var, _scope, value);
185 } catch (IOException e) {
186 } catch (ParseException e) {
187 throw new JspException (e);
188 } catch (ELException e) {
189 throw new JspException (e);
190 }
191
192 return EVAL_PAGE;
193 }
194
195 protected DateFormat getFormat()
196 throws JspException , ELException
197 {
198 PageContextImpl pageContext = (PageContextImpl) this.pageContext;
199 ELContext env = pageContext.getELContext();
200
201 DateFormat format = null;
202 Locale locale = null;
203
204 if (_parseLocaleExpr != null) {
205 Object localeObj = _parseLocaleExpr.evalObject(env);
206
207 if (localeObj instanceof Locale )
208 locale = (Locale ) localeObj;
209 else if (localeObj instanceof String )
210 locale = pageContext.getLocale((String ) localeObj, null);
211 }
212
213 if (locale == null)
214 locale = pageContext.getLocale();
215
216 String type = null;
217
218 if (_typeExpr != null)
219 type = _typeExpr.evalString(env);
220
221 int dateStyle = DateFormat.DEFAULT;
222 if (_dateStyleExpr != null)
223 dateStyle = getDateStyle(_dateStyleExpr.evalString(env));
224
225 int timeStyle = DateFormat.DEFAULT;
226 if (_timeStyleExpr != null)
227 timeStyle = getDateStyle(_timeStyleExpr.evalString(env));
228
229 if (locale != null) {
230 if (type == null || type.equals("date"))
231 format = DateFormat.getDateInstance(dateStyle, locale);
232 else if (type.equals("both"))
233 format = DateFormat.getDateTimeInstance(dateStyle,
234 timeStyle,
235 locale);
236 else if (type.equals("time"))
237 format = DateFormat.getTimeInstance(timeStyle, locale);
238 else
239 throw new JspException (L.l("illegal type `{0}'", type));
240 }
241 else {
242 if (type == null || type.equals("date"))
243 format = DateFormat.getDateInstance(dateStyle);
244 else if (type.equals("both"))
245 format = DateFormat.getDateTimeInstance(dateStyle, timeStyle);
246 else if (type.equals("time"))
247 format = DateFormat.getTimeInstance(timeStyle);
248 else
249 throw new JspException (L.l("illegal type `{0}'", type));
250 }
251
252 if (format == null)
253 return null;
254
255 if (_patternExpr != null) {
256 String pattern = _patternExpr.evalString(env);
257 try {
258 ((SimpleDateFormat ) format).applyPattern(pattern);
259 } catch (ClassCastException e) {
260 format = new SimpleDateFormat (pattern, locale);
261 }
262 }
263
264 TimeZone timeZone = getTimeZone();
265 if (timeZone != null)
266 format.setTimeZone(timeZone);
267
268 return format;
269 }
270
271 private TimeZone getTimeZone()
272 throws ELException
273 {
274 if (_timeZoneExpr != null) {
275 PageContextImpl pageContext = (PageContextImpl) this.pageContext;
276 Object timeZoneObj = _timeZoneExpr.evalObject(pageContext.getELContext());
277
278 TimeZone zone = getTimeZone(timeZoneObj);
279 if (zone != null)
280 return zone;
281 }
282
283 Object timeZoneObj = pageContext.getAttribute("com.caucho.time-zone");
284
285 if (timeZoneObj != null)
286 return (TimeZone ) timeZoneObj;
287
288 timeZoneObj = Config.find(pageContext, Config.FMT_TIME_ZONE);
289
290 return getTimeZone(timeZoneObj);
291 }
292
293 private TimeZone getTimeZone(Object timeZoneObj)
294 {
295 if (timeZoneObj instanceof TimeZone )
296 return (TimeZone ) timeZoneObj;
297 else if (timeZoneObj instanceof String ) {
298 String timeZoneString = (String ) timeZoneObj;
299
300 return TimeZone.getTimeZone(timeZoneString);
301 }
302
303 return null;
304 }
305
306 public static int getDateStyle(String style)
307 throws JspException
308 {
309 if (style == null || style.equals("default"))
310 return DateFormat.DEFAULT;
311 else if (style.equals("short"))
312 return DateFormat.SHORT;
313 else if (style.equals("medium"))
314 return DateFormat.MEDIUM;
315 else if (style.equals("long"))
316 return DateFormat.LONG;
317 else if (style.equals("full"))
318 return DateFormat.FULL;
319 else
320 throw new JspException (L.l("illegal date style `{0}'", style));
321 }
322 }
323 |
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