Mercurial > hg > Members > sugi > MessagePack-java

comparison src/main/java/org/msgpack/template/builder/beans/EventSetDescriptor.java @ 0:cb825acd883a

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author sugi
date Sat, 18 Oct 2014 15:06:15 +0900
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1 // MODIFIED FOR THE MSGPACK PROJECT
2 // Licensed to the Apache Software Foundation (ASF) under one or more
3 // contributor license agreements. See the NOTICE file distributed with
4 // this work for additional information regarding copyright ownership.
5 // The ASF licenses this file to You under the Apache License, Version 2.0
6 // (the "License"); you may not use this file except in compliance with
7 // the License. You may obtain a copy of the License at
8 //
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
13 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
14 // License for the specific language governing permissions and limitations under
15 // the License.
16 //
17
18 package org.msgpack.template.builder.beans;
19
20 import java.lang.reflect.Method;
21 import java.util.ArrayList;
22 import java.util.TooManyListenersException;
23 import org.apache.harmony.beans.internal.nls.Messages;
24
25 public class EventSetDescriptor extends FeatureDescriptor {
26 private Class<?> listenerType;
27
28 private ArrayList<MethodDescriptor> listenerMethodDescriptors;
29
30 private Method[] listenerMethods;
31
32 private Method getListenerMethod;
33
34 private Method addListenerMethod;
35
36 private Method removeListenerMethod;
37
38 private boolean unicast;
39
40 private boolean inDefaultEventSet = true;
41
42 public EventSetDescriptor(Class<?> sourceClass, String eventSetName,
43 Class<?> listenerType, String listenerMethodName)
44 throws IntrospectionException {
45 checkNotNull(sourceClass, eventSetName, listenerType,
46 listenerMethodName);
47 setName(eventSetName);
48 this.listenerType = listenerType;
49
50 Method method = findListenerMethodByName(listenerMethodName);
51 checkEventType(eventSetName, method);
52 listenerMethodDescriptors = new ArrayList<MethodDescriptor>();
53 listenerMethodDescriptors.add(new MethodDescriptor(method));
54 addListenerMethod = findMethodByPrefix(sourceClass, "add", ""); //$NON-NLS-1$ //$NON-NLS-2$
55 removeListenerMethod = findMethodByPrefix(sourceClass, "remove", ""); //$NON-NLS-1$ //$NON-NLS-2$
56
57 if (addListenerMethod == null || removeListenerMethod == null) {
58 throw new IntrospectionException(Messages.getString("custom.beans.38")); //$NON-NLS-1$
59 }
60
61 getListenerMethod = findMethodByPrefix(sourceClass, "get", "s"); //$NON-NLS-1$ //$NON-NLS-2$
62 unicast = isUnicastByDefault(addListenerMethod);
63 }
64
65 public EventSetDescriptor(Class<?> sourceClass, String eventSetName,
66 Class<?> listenerType, String[] listenerMethodNames,
67 String addListenerMethodName, String removeListenerMethodName)
68 throws IntrospectionException {
69 this(sourceClass, eventSetName, listenerType, listenerMethodNames,
70 addListenerMethodName, removeListenerMethodName, null);
71
72 }
73
74 public EventSetDescriptor(Class<?> sourceClass, String eventSetName,
75 Class<?> listenerType, String[] listenerMethodNames,
76 String addListenerMethodName, String removeListenerMethodName,
77 String getListenerMethodName) throws IntrospectionException {
78
79 checkNotNull(sourceClass, eventSetName, listenerType,
80 listenerMethodNames);
81
82 setName(eventSetName);
83 this.listenerType = listenerType;
84
85 listenerMethodDescriptors = new ArrayList<MethodDescriptor>();
86 for (String element : listenerMethodNames) {
87 Method m = findListenerMethodByName(element);
88
89 // checkEventType(eventSetName, m);
90 listenerMethodDescriptors.add(new MethodDescriptor(m));
91 }
92
93 if (addListenerMethodName != null) {
94 this.addListenerMethod = findAddRemoveListenerMethod(sourceClass,
95 addListenerMethodName);
96 }
97 if (removeListenerMethodName != null) {
98 this.removeListenerMethod = findAddRemoveListenerMethod(
99 sourceClass, removeListenerMethodName);
100 }
101 if (getListenerMethodName != null) {
102 this.getListenerMethod = findGetListenerMethod(sourceClass,
103 getListenerMethodName);
104 }
105 this.unicast = isUnicastByDefault(addListenerMethod);
106 }
107
108 private Method findListenerMethodByName(String listenerMethodName)
109 throws IntrospectionException {
110 Method result = null;
111 Method[] methods = listenerType.getMethods();
112 for (Method method : methods) {
113 if (listenerMethodName.equals(method.getName())) {
114 Class<?>[] paramTypes = method.getParameterTypes();
115 if (paramTypes.length == 1
116 && paramTypes[0].getName().endsWith("Event")) { //$NON-NLS-1$
117 result = method;
118 break;
119 }
120
121 }
122 }
123 if (null == result) {
124 throw new IntrospectionException(Messages.getString("custom.beans.31", //$NON-NLS-1$
125 listenerMethodName, listenerType.getName()));
126 }
127 return result;
128 }
129
130 public EventSetDescriptor(String eventSetName, Class<?> listenerType,
131 Method[] listenerMethods, Method addListenerMethod,
132 Method removeListenerMethod) throws IntrospectionException {
133
134 this(eventSetName, listenerType, listenerMethods, addListenerMethod,
135 removeListenerMethod, null);
136 }
137
138 public EventSetDescriptor(String eventSetName, Class<?> listenerType,
139 Method[] listenerMethods, Method addListenerMethod,
140 Method removeListenerMethod, Method getListenerMethod)
141 throws IntrospectionException {
142
143 setName(eventSetName);
144 this.listenerType = listenerType;
145
146 this.listenerMethods = listenerMethods;
147 if (listenerMethods != null) {
148 listenerMethodDescriptors = new ArrayList<MethodDescriptor>();
149
150 for (Method element : listenerMethods) {
151 // XXX do we need this check?
152 // checkEventType(eventSetName, element);
153 // if (checkMethod(listenerType, element)) {
154 this.listenerMethodDescriptors
155 .add(new MethodDescriptor(element));
156 // }
157 }
158 }
159
160 this.addListenerMethod = addListenerMethod;
161 this.removeListenerMethod = removeListenerMethod;
162 this.getListenerMethod = getListenerMethod;
163 this.unicast = isUnicastByDefault(addListenerMethod);
164 }
165
166 public EventSetDescriptor(String eventSetName, Class<?> listenerType,
167 MethodDescriptor[] listenerMethodDescriptors,
168 Method addListenerMethod, Method removeListenerMethod)
169 throws IntrospectionException {
170
171 this(eventSetName, listenerType, null, addListenerMethod,
172 removeListenerMethod, null);
173
174 if (listenerMethodDescriptors != null) {
175 this.listenerMethodDescriptors = new ArrayList<MethodDescriptor>();
176
177 for (MethodDescriptor element : listenerMethodDescriptors) {
178 this.listenerMethodDescriptors.add(element);
179 }
180 }
181 }
182
183 // ensures that there is no nulls
184 @SuppressWarnings("nls")
185 private void checkNotNull(Object sourceClass, Object eventSetName,
186 Object alistenerType, Object listenerMethodName) {
187 if (sourceClass == null) {
188 throw new NullPointerException(Messages.getString("custom.beans.0C"));
189 }
190 if (eventSetName == null) {
191 throw new NullPointerException(Messages.getString("custom.beans.53"));
192 }
193 if (alistenerType == null) {
194 throw new NullPointerException(Messages.getString("custom.beans.54"));
195 }
196 if (listenerMethodName == null) {
197 throw new NullPointerException(Messages.getString("custom.beans.52"));
198 }
199 }
200
201 /**
202 * Checks that given listener method has an argument of the valid type.
203 *
204 * @param eventSetName
205 * event set name
206 * @param listenerMethod
207 * listener method
208 * @throws IntrospectionException
209 * if check fails
210 */
211 private static void checkEventType(String eventSetName,
212 Method listenerMethod) throws IntrospectionException {
213 Class<?>[] params = listenerMethod.getParameterTypes();
214 String firstParamTypeName = null;
215 String eventTypeName = prepareEventTypeName(eventSetName);
216
217 if (params.length > 0) {
218 firstParamTypeName = extractShortClassName(params[0]
219 .getName());
220 }
221
222 if (firstParamTypeName == null
223 || !firstParamTypeName.equals(eventTypeName)) {
224 throw new IntrospectionException(Messages.getString("custom.beans.51", //$NON-NLS-1$
225 listenerMethod.getName(), eventTypeName));
226 }
227 }
228
229 /**
230 * @param fullClassName full name of the class
231 * @return name with package and encapsulating class info omitted
232 */
233 private static String extractShortClassName(String fullClassName) {
234 int k = fullClassName.lastIndexOf('$');
235 k = (k == -1 ? fullClassName.lastIndexOf('.') : k);
236 return fullClassName.substring(k + 1);
237 }
238
239 private static String prepareEventTypeName(String eventSetName) {
240 StringBuilder sb = new StringBuilder();
241
242 if (eventSetName != null && eventSetName.length() > 0) {
243 sb.append(Character.toUpperCase(eventSetName.charAt(0)));
244
245 if (eventSetName.length() > 1) {
246 sb.append(eventSetName.substring(1));
247 }
248 }
249
250 sb.append("Event"); //$NON-NLS-1$
251 return sb.toString();
252 }
253
254 public Method[] getListenerMethods() {
255 if (listenerMethods != null) {
256 return listenerMethods;
257 }
258
259 if (listenerMethodDescriptors != null) {
260 listenerMethods = new Method[listenerMethodDescriptors.size()];
261 int index = 0;
262 for (MethodDescriptor md : listenerMethodDescriptors) {
263 listenerMethods[index++] = md.getMethod();
264 }
265 return listenerMethods;
266 }
267 return null;
268 }
269
270 public MethodDescriptor[] getListenerMethodDescriptors() {
271 return listenerMethodDescriptors == null ? null
272 : listenerMethodDescriptors.toArray(new MethodDescriptor[0]);
273 }
274
275 public Method getRemoveListenerMethod() {
276 return removeListenerMethod;
277 }
278
279 public Method getGetListenerMethod() {
280 return getListenerMethod;
281 }
282
283 public Method getAddListenerMethod() {
284 return addListenerMethod;
285 }
286
287 public Class<?> getListenerType() {
288 return listenerType;
289 }
290
291 public void setUnicast(boolean unicast) {
292 this.unicast = unicast;
293 }
294
295 public void setInDefaultEventSet(boolean inDefaultEventSet) {
296 this.inDefaultEventSet = inDefaultEventSet;
297 }
298
299 public boolean isUnicast() {
300 return unicast;
301 }
302
303 public boolean isInDefaultEventSet() {
304 return inDefaultEventSet;
305 }
306
307 /**
308 * Searches for {add|remove}Listener methods in the event source. Parameter
309 * check is also performed.
310 *
311 * @param sourceClass
312 * event source class
313 * @param methodName
314 * method name to search
315 * @return found method
316 * @throws IntrospectionException
317 * if no valid method found
318 */
319 private Method findAddRemoveListenerMethod(Class<?> sourceClass,
320 String methodName) throws IntrospectionException {
321 try {
322 return sourceClass.getMethod(methodName, listenerType);
323 } catch (NoSuchMethodException e) {
324 return findAddRemoveListnerMethodWithLessCheck(sourceClass,
325 methodName);
326 } catch (Exception e) {
327 throw new IntrospectionException(Messages.getString("custom.beans.31", //$NON-NLS-1$
328 methodName, listenerType.getName()));
329 }
330 }
331
332 private Method findAddRemoveListnerMethodWithLessCheck(
333 Class<?> sourceClass, String methodName)
334 throws IntrospectionException {
335 Method[] methods = sourceClass.getMethods();
336 Method result = null;
337 for (Method method : methods) {
338 if (method.getName().equals(methodName)) {
339 Class<?>[] paramTypes = method.getParameterTypes();
340 if (paramTypes.length == 1) {
341 result = method;
342 break;
343 }
344 }
345 }
346 if (null == result) {
347 throw new IntrospectionException(Messages.getString("custom.beans.31", //$NON-NLS-1$
348 methodName, listenerType.getName()));
349 }
350 return result;
351 }
352
353 /**
354 * @param sourceClass
355 * class of event source
356 * @param methodName
357 * name of the custom getListeners() method
358 * @return found Method object for custom getListener or null if nothing is
359 * found
360 */
361 private Method findGetListenerMethod(Class<?> sourceClass, String methodName) {
362 try {
363 return sourceClass.getMethod(methodName);
364 } catch (Exception e) {
365 // RI keeps silence here and just returns null
366 return null;
367 }
368 }
369
370 private Method findMethodByPrefix(Class<?> sourceClass, String prefix,
371 String postfix) {
372 String shortName = listenerType.getName();
373 if (listenerType.getPackage() != null) {
374 shortName = shortName.substring(listenerType.getPackage().getName()
375 .length() + 1);
376 }
377 String methodName = prefix + shortName + postfix;
378 try {
379 if ("get".equals(prefix)) { //$NON-NLS-1$
380 return sourceClass.getMethod(methodName);
381 }
382 } catch (NoSuchMethodException nsme) {
383 return null;
384 }
385 Method[] methods = sourceClass.getMethods();
386 for (int i = 0; i < methods.length; i++) {
387 if (methods[i].getName().equals(methodName)) {
388 Class<?>[] paramTypes = methods[i].getParameterTypes();
389 if (paramTypes.length == 1) {
390 return methods[i];
391 }
392 }
393 }
394 return null;
395 }
396
397 private static boolean isUnicastByDefault(Method addMethod) {
398 if (addMethod != null) {
399 Class<?>[] exceptionTypes = addMethod.getExceptionTypes();
400 for (Class<?> element : exceptionTypes) {
401 if (element.equals(TooManyListenersException.class)) {
402 return true;
403 }
404 }
405 }
406 return false;
407 }
408
409 void merge(EventSetDescriptor event) {
410 super.merge(event);
411 if (addListenerMethod == null) {
412 addListenerMethod = event.addListenerMethod;
413 }
414 if (getListenerMethod == null) {
415 getListenerMethod = event.getListenerMethod;
416 }
417 if (listenerMethodDescriptors == null) {
418 listenerMethodDescriptors = event.listenerMethodDescriptors;
419 }
420 if (listenerMethods == null) {
421 listenerMethods = event.listenerMethods;
422 }
423 if (listenerType == null) {
424 listenerType = event.listenerType;
425 }
426
427 if (removeListenerMethod == null) {
428 removeListenerMethod = event.removeListenerMethod;
429 }
430 inDefaultEventSet &= event.inDefaultEventSet;
431 }
432 }