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1 package org.apache.velocity.util.introspection;
2
3
18
19 import org.apache.velocity.util.ArrayIterator;
20 import org.apache.velocity.util.EnumerationIterator;
21 import org.apache.velocity.runtime.RuntimeServices;
22 import org.apache.velocity.runtime.RuntimeLogger;
23 import org.apache.velocity.runtime.parser.node.AbstractExecutor;
24 import org.apache.velocity.runtime.parser.node.PropertyExecutor;
25 import org.apache.velocity.runtime.parser.node.GetExecutor;
26 import org.apache.velocity.runtime.parser.node.BooleanPropertyExecutor;
27
28 import java.lang.reflect.Method  ;
29 import java.util.Iterator ;
30 import java.util.Collection ;
31 import java.util.Map ;
32 import java.util.Enumeration ;
33 import java.util.ArrayList ;
34
35
42 public class UberspectImpl implements Uberspect, UberspectLoggable
43 {
44
47 private RuntimeLogger rlog;
48
49
52 private static Introspector introspector;
53
54
59 public void init()
60 throws Exception
61 {
62 }
63
64
69 public void setRuntimeLogger(RuntimeLogger runtimeLogger)
70 {
71 rlog = runtimeLogger;
72 introspector = new Introspector(rlog);
73 }
74
75
78 public Iterator getIterator(Object obj, Info i)
79 throws Exception
80 {
81 if (obj.getClass().isArray())
82 {
83 return new ArrayIterator(obj);
84 }
85 else if (obj instanceof Collection )
86 {
87 return ((Collection ) obj).iterator();
88 }
89 else if (obj instanceof Map )
90 {
91 return ((Map ) obj).values().iterator();
92 }
93 else if (obj instanceof Iterator)
94 {
95 rlog.warn ("Warning! The iterative "
96 + " is an Iterator in the #foreach() loop at ["
97 + i.getLine() + "," + i.getColumn() + "]"
98 + " in template " + i.getTemplateName()
99 + ". Because it's not resetable,"
100 + " if used in more than once, this may lead to"
101 + " unexpected results.");
102
103 return ((Iterator) obj);
104 }
105 else if (obj instanceof Enumeration )
106 {
107 rlog.warn ("Warning! The iterative "
108 + " is an Enumeration in the #foreach() loop at ["
109 + i.getLine() + "," + i.getColumn() + "]"
110 + " in template " + i.getTemplateName()
111 + ". Because it's not resetable,"
112 + " if used in more than once, this may lead to"
113 + " unexpected results.");
114
115 return new EnumerationIterator((Enumeration ) obj);
116 }
117
118
119 rlog.warn ("Could not determine type of iterator in "
120 + "#foreach loop "
121 + " at [" + i.getLine() + "," + i.getColumn() + "]"
122 + " in template " + i.getTemplateName() );
123
124 return null;
125 }
126
127
130 public VelMethod getMethod(Object obj, String methodName, Object [] args, Info i)
131 throws Exception
132 {
133 if (obj == null)
134 return null;
135
136 Method m = introspector.getMethod(obj.getClass(), methodName, args);
137
138 return (m != null) ? new VelMethodImpl(m) : null;
139 }
140
141
144 public VelPropertyGet getPropertyGet(Object obj, String identifier, Info i)
145 throws Exception
146 {
147 AbstractExecutor executor;
148
149 Class claz = obj.getClass();
150
151
155
156 executor = new PropertyExecutor(rlog,introspector, claz, identifier);
157
158
161
162 if (executor.isAlive() == false)
163 {
164 executor = new GetExecutor(rlog, introspector, claz, identifier);
165 }
166
167
170
171 if( executor.isAlive() == false)
172 {
173 executor = new BooleanPropertyExecutor(rlog, introspector, claz, identifier);
174 }
175
176 return (executor != null) ? new VelGetterImpl(executor) : null;
177 }
178
179
182 public VelPropertySet getPropertySet(Object obj, String identifier, Object arg, Info i)
183 throws Exception
184 {
185 Class claz = obj.getClass();
186
187 VelPropertySet vs = null;
188 VelMethod vm = null;
189 try
190 {
191
194
195 Object [] params = {arg};
196
197 try
198 {
199 vm = getMethod(obj, "set" + identifier, params, i);
200
201 if (vm == null)
202 {
203 throw new NoSuchMethodException ();
204 }
205 }
206 catch(NoSuchMethodException nsme2)
207 {
208 StringBuffer sb = new StringBuffer ("set");
209 sb.append(identifier);
210
211 if (Character.isLowerCase( sb.charAt(3)))
212 {
213 sb.setCharAt(3, Character.toUpperCase(sb.charAt(3)));
214 }
215 else
216 {
217 sb.setCharAt(3, Character.toLowerCase(sb.charAt(3)));
218 }
219
220 vm = getMethod(obj, sb.toString(), params, i);
221
222 if (vm == null)
223 {
224 throw new NoSuchMethodException ();
225 }
226 }
227 }
228 catch (NoSuchMethodException nsme)
229 {
230
233
234 if (Map .class.isAssignableFrom(claz))
235 {
236 Object [] params = {new Object (), new Object ()};
237
238 vm = getMethod(obj, "put", params, i);
239
240 if (vm!=null)
241 return new VelSetterImpl(vm, identifier);
242 }
243 }
244
245 return (vm!=null) ? new VelSetterImpl(vm) : null;
246 }
247
248
251 public class VelMethodImpl implements VelMethod
252 {
253 Method method = null;
254
255 public VelMethodImpl(Method m)
256 {
257 method = m;
258 }
259
260 private VelMethodImpl()
261 {
262 }
263
264 public Object invoke(Object o, Object [] params)
265 throws Exception
266 {
267 return method.invoke(o, params);
268 }
269
270 public boolean isCacheable()
271 {
272 return true;
273 }
274
275 public String getMethodName()
276 {
277 return method.getName();
278 }
279
280 public Class getReturnType()
281 {
282 return method.getReturnType();
283 }
284 }
285
286 public class VelGetterImpl implements VelPropertyGet
287 {
288 AbstractExecutor ae = null;
289
290 public VelGetterImpl(AbstractExecutor exec)
291 {
292 ae = exec;
293 }
294
295 private VelGetterImpl()
296 {
297 }
298
299 public Object invoke(Object o)
300 throws Exception
301 {
302 return ae.execute(o);
303 }
304
305 public boolean isCacheable()
306 {
307 return true;
308 }
309
310 public String getMethodName()
311 {
312 return ae.getMethod().getName();
313 }
314
315 }
316
317 public class VelSetterImpl implements VelPropertySet
318 {
319 VelMethod vm = null;
320 String putKey = null;
321
322 public VelSetterImpl(VelMethod velmethod)
323 {
324 this.vm = velmethod;
325 }
326
327 public VelSetterImpl(VelMethod velmethod, String key)
328 {
329 this.vm = velmethod;
330 putKey = key;
331 }
332
333 private VelSetterImpl()
334 {
335 }
336
337 public Object invoke(Object o, Object value)
338 throws Exception
339 {
340 ArrayList al = new ArrayList ();
341
342 if (putKey != null)
343 {
344 al.add(putKey);
345 al.add(value);
346 }
347 else
348 {
349 al.add(value);
350 }
351
352 return vm.invoke(o,al.toArray());
353 }
354
355 public boolean isCacheable()
356 {
357 return true;
358 }
359
360 public String getMethodName()
361 {
362 return vm.getMethodName();
363 }
364
365 }
366 }
367 |
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