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1
15 package org.josql.functions;
16
17 import java.io.File  ;
18
19 import java.util.Random ;
20 import java.util.List ;
21 import java.util.Date ;
22 import java.util.Calendar ;
23 import java.util.Map ;
24 import java.util.HashMap ;
25
26 import com.gentlyweb.utils.Getter;
27
28 import org.josql.Query;
29 import org.josql.QueryExecutionException;
30
31 import org.josql.expressions.Expression;
32
33 public class MiscellaneousFunctions extends AbstractFunctionHandler
34 {
35
36 public static final String HANDLER_ID = "_internal_misc";
37
38 private Map accessorCache = new HashMap ();
39
40 private Random rand = new Random ();
41
42
49 public Date now (boolean zeroTime)
50 {
51
52 Date d = null;
53
54 if (zeroTime)
55 {
56
57 Calendar c = Calendar.getInstance ();
58
59 c.set (Calendar.HOUR_OF_DAY,
60 0);
61 c.set (Calendar.MINUTE,
62 0);
63 c.set (Calendar.SECOND,
64 0);
65 c.set (Calendar.MILLISECOND,
66 0);
67
68 d = c.getTime ();
69
70 } else {
71
72 d = new Date ();
73
74 }
75
76 return d;
77
78 }
79
80 public void cache (List allobjs,
81 Getter get)
82 throws QueryExecutionException
83 {
84
85 int s = allobjs.size ();
86
87 for (int i = 0; i < s; i++)
88 {
89
90 Object o = allobjs.get (i);
91
92 try
93 {
94
95 this.q.setSaveValue (o,
96 get.getValue (o));
97
98 } catch (Exception e) {
99
100 throw new QueryExecutionException ("Unable to get value from accessor: " +
101 get +
102 " from object: " +
103 i,
104 e);
105
106 }
107
108 }
109
110 }
111
112 public void cache (List allobjs,
113 Expression exp)
114 throws QueryExecutionException
115 {
116
117 Object co = this.q.getCurrentObject ();
118
119 int s = allobjs.size ();
120
121 for (int i = 0; i < s; i++)
122 {
123
124 Object o = allobjs.get (i);
125
126 this.q.setCurrentObject (o);
127
128 try
129 {
130
131 this.q.setSaveValue (o,
132 exp.getValue (o,
133 q));
134
135 } catch (Exception e) {
136
137 throw new QueryExecutionException ("Unable to get value from expression: " +
138 exp +
139 " from object: " +
140 i,
141 e);
142
143 }
144
145 }
146
147 this.q.setCurrentObject (co);
148
149 }
150
151 public double abs (Number d)
152 {
153
154 return Math.abs (d.doubleValue ());
155
156 }
157
158 public int random ()
159 {
160
161 return this.rand.nextInt ();
162
163 }
164
165 public int random (Number n)
166 {
167
168 return this.rand.nextInt (n.intValue ());
169
170 }
171
172 public double randomDouble ()
173 {
174
175 return this.rand.nextDouble ();
176
177 }
178
179 public Object saveValue (Object saveValueName)
180 {
181
182 return this.q.getSaveValue (saveValueName);
183
184 }
185
186 public Object savevalue (Object saveValueName)
187 {
188
189 return this.q.getSaveValue (saveValueName);
190
191 }
192
193 public Object save_value (Object saveValueName)
194 {
195
196 return this.q.getSaveValue (saveValueName);
197
198 }
199
200 public String fileExtension (Object f)
201 {
202
203 if (f == null)
204 {
205
206 return null;
207
208 }
209
210 String n = null;
211
212 if (f instanceof String )
213 {
214
215 n = (String ) f;
216
217 }
218
219 if (f instanceof File )
220 {
221
222 File fi = (File ) f;
223
224 if (fi.isDirectory ())
225 {
226
227 return null;
228
229 }
230
231 n = ((File ) f).getName ();
232
233 }
234
235 return n.substring (n.lastIndexOf (".") + 1);
236
237 }
238
239
247 public Object accessor (Expression oExp,
248 Expression accExp)
249 throws Exception
250 {
251
252 Object o = null;
254
255 try
256 {
257
258 o = oExp.getValue (this.q.getCurrentObject (),
259 this.q);
260
261 } catch (Exception e) {
262
263 throw new QueryExecutionException ("Unable to evaluate expression: " +
264 oExp +
265 " to get object.");
266
267 }
268
269 Object a = null;
270
271 try
272 {
273
274 a = accExp.getValue (this.q.getCurrentObject (),
275 this.q);
276
277 } catch (Exception e) {
278
279 throw new QueryExecutionException ("Unable to evaluate expression: " +
280 accExp +
281 " to get accessor.");
282
283 }
284
285 if (a == null)
286 {
287
288 throw new QueryExecutionException ("Accessor expression: " +
289 accExp +
290 " evaluates to null for object: " +
291 o +
292 " returned from expression: " +
293 oExp);
294
295 }
296
297 return this.accessor (o,
299 a.toString ());
300
301 }
302
303
311 public Object accessor (Object o,
312 String acc)
313 throws Exception
314 {
315
316 if (o == null)
317 {
318
319 return null;
320
321 }
322
323 Getter g = (Getter) this.accessorCache.get (o.getClass ().getName () + acc);
325
326 if (g == null)
327 {
328
329 g = new Getter (acc,
331 o.getClass ());
332
333 this.accessorCache.put (o.getClass ().getName () + acc,
334 g);
335
336 }
337
338 return g.getValue (o);
339
340 }
341
342 public Object ifThen (Expression ifcond,
343 Expression thenVal)
344 throws QueryExecutionException
345 {
346
347 if (ifcond.isTrue (this.q.getCurrentObject (),
348 this.q))
349 {
350
351 return thenVal.getValue (this.q.getCurrentObject (),
352 this.q);
353
354 }
355
356 return null;
357
358 }
359
360 public Object ifThenElse (Expression ifcond,
361 Expression thenVal,
362 Expression elseVal)
363 throws QueryExecutionException
364 {
365
366 Object i = this.ifThen (ifcond,
367 thenVal);
368
369 if (i == null)
370 {
371
372 return elseVal.getValue (this.q.getCurrentObject (),
373 this.q);
374
375 }
376
377 return i;
378
379 }
380
381 public Object eval (Expression exp)
382 throws QueryExecutionException
383 {
384
385 return exp.getValue (this.q.getCurrentObject (),
386 this.q);
387
388 }
389
390
409 public Boolean instanceOf (Expression obj,
410 Expression clazz)
411 throws QueryExecutionException
412 {
413
414 return Boolean.valueOf (clazz.getValue (this.q.getCurrentObject (),
415 q).getClass ().isInstance (obj.getValue (this.q.getCurrentObject (),
416 q)));
417
418 }
419
420 }
421 |
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