Source Code Cross Referenced for Method.java in  » Apache-Harmony-Java-SE » java-package » java » lang » reflect » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.lang.reflect 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */
017:        /**
018:         * @author Evgueni Brevnov, Serguei S. Zapreyev, Alexey V. Varlamov
019:         * @version $Revision: 1.1.2.2.4.4 $
020:         */package java.lang.reflect;
021:
022:        import static org.apache.harmony.vm.ClassFormat.ACC_BRIDGE;
023:        import static org.apache.harmony.vm.ClassFormat.ACC_SYNTHETIC;
024:        import static org.apache.harmony.vm.ClassFormat.ACC_VARARGS;
025:
026:        import java.lang.annotation.Annotation;
027:        import java.util.Arrays;
028:
029:        import org.apache.harmony.lang.reflect.parser.Parser;
030:        import org.apache.harmony.vm.VMGenericsAndAnnotations;
031:        import org.apache.harmony.vm.VMStack;
032:
033:        /**
034:         * @com.intel.drl.spec_ref 
035:         */
036:        public final class Method extends AccessibleObject implements  Member,
037:                GenericDeclaration {
038:
039:            /**
040:             *  @com.intel.drl.spec_ref
041:             */
042:            public boolean isBridge() {
043:                return (getModifiers() & ACC_BRIDGE) != 0;
044:            }
045:
046:            /**
047:             *  @com.intel.drl.spec_ref
048:             */
049:            public boolean isVarArgs() {
050:                return (getModifiers() & ACC_VARARGS) != 0;
051:            }
052:
053:            /**
054:             *  @com.intel.drl.spec_ref
055:             */
056:            public Annotation[][] getParameterAnnotations() {
057:                Annotation a[][] = data.getParameterAnnotations();
058:                Annotation aa[][] = new Annotation[a.length][];
059:                for (int i = 0; i < a.length; i++) {
060:                    aa[i] = new Annotation[a[i].length];
061:                    System.arraycopy(a[i], 0, aa[i], 0, a[i].length);
062:                }
063:                return aa;
064:            }
065:
066:            /**
067:             *  @com.intel.drl.spec_ref
068:             */
069:            public Annotation[] getDeclaredAnnotations() {
070:                Annotation a[] = data.getDeclaredAnnotations();
071:                Annotation aa[] = new Annotation[a.length];
072:                System.arraycopy(a, 0, aa, 0, a.length);
073:                return aa;
074:            }
075:
076:            /**
077:             *  @com.intel.drl.spec_ref
078:             */
079:            @SuppressWarnings("unchecked")
080:            public <A extends Annotation> A getAnnotation(
081:                    Class<A> annotationClass) {
082:                if (annotationClass == null) {
083:                    throw new NullPointerException();
084:                }
085:                for (Annotation aa : data.getDeclaredAnnotations()) {
086:                    if (aa.annotationType() == annotationClass) {
087:
088:                        return (A) aa;
089:                    }
090:                }
091:                return null;
092:            }
093:
094:            /**
095:             *  @com.intel.drl.spec_ref
096:             */
097:            public Type[] getGenericExceptionTypes()
098:                    throws GenericSignatureFormatError,
099:                    TypeNotPresentException,
100:                    MalformedParameterizedTypeException {
101:                if (data.genericExceptionTypes == null) {
102:                    data.genericExceptionTypes = Parser
103:                            .getGenericExceptionTypes(this ,
104:                                    VMGenericsAndAnnotations
105:                                            .getSignature(data.vm_member_id));
106:                }
107:                return (Type[]) data.genericExceptionTypes.clone();
108:            }
109:
110:            /**
111:             *  @com.intel.drl.spec_ref
112:             */
113:            public Type[] getGenericParameterTypes()
114:                    throws GenericSignatureFormatError,
115:                    TypeNotPresentException,
116:                    MalformedParameterizedTypeException {
117:                if (data.genericParameterTypes == null) {
118:                    data.genericParameterTypes = Parser
119:                            .getGenericParameterTypes(this ,
120:                                    VMGenericsAndAnnotations
121:                                            .getSignature(data.vm_member_id));
122:                }
123:
124:                return (Type[]) data.genericParameterTypes.clone();
125:            }
126:
127:            /**
128:             *  @com.intel.drl.spec_ref
129:             */
130:            public Type getGenericReturnType()
131:                    throws GenericSignatureFormatError,
132:                    TypeNotPresentException,
133:                    MalformedParameterizedTypeException {
134:                if (data.genericReturnType == null) {
135:                    data.genericReturnType = Parser.getGenericReturnTypeImpl(
136:                            this , VMGenericsAndAnnotations
137:                                    .getSignature(data.vm_member_id));
138:                }
139:                return data.genericReturnType;
140:            }
141:
142:            /**
143:             *  @com.intel.drl.spec_ref
144:             */
145:            @SuppressWarnings("unchecked")
146:            public TypeVariable<Method>[] getTypeParameters()
147:                    throws GenericSignatureFormatError {
148:                if (data.typeParameters == null) {
149:                    data.typeParameters = Parser.getTypeParameters(this ,
150:                            VMGenericsAndAnnotations
151:                                    .getSignature(data.vm_member_id));
152:                }
153:                return (TypeVariable<Method>[]) data.typeParameters.clone();
154:            }
155:
156:            /**
157:             * @com.intel.drl.spec_ref 
158:             */
159:            public String toGenericString() {
160:                StringBuilder sb = new StringBuilder(80);
161:                // data initialization
162:                if (data.genericParameterTypes == null) {
163:                    data.genericParameterTypes = Parser
164:                            .getGenericParameterTypes(this ,
165:                                    VMGenericsAndAnnotations
166:                                            .getSignature(data.vm_member_id));
167:                }
168:                if (data.genericExceptionTypes == null) {
169:                    data.genericExceptionTypes = Parser
170:                            .getGenericExceptionTypes(this ,
171:                                    VMGenericsAndAnnotations
172:                                            .getSignature(data.vm_member_id));
173:                }
174:                // append modifiers if any
175:                int modifier = getModifiers();
176:                if (modifier != 0) {
177:                    sb.append(
178:                            Modifier.toString(modifier
179:                                    & ~(ACC_BRIDGE + ACC_VARARGS))).append(' ');
180:                }
181:                // append type parameters
182:                if (data.typeParameters != null
183:                        && data.typeParameters.length > 0) {
184:                    sb.append('<');
185:                    for (int i = 0; i < data.typeParameters.length; i++) {
186:                        appendGenericType(sb, data.typeParameters[i]);
187:                        if (i < data.typeParameters.length - 1) {
188:                            sb.append(", ");
189:                        }
190:                    }
191:                    sb.append("> ");
192:                }
193:                // append return type
194:                appendGenericType(sb, getGenericReturnType());
195:                sb.append(' ');
196:                // append method name
197:                appendArrayType(sb, getDeclaringClass());
198:                sb.append("." + getName());
199:                // append parameters
200:                sb.append('(');
201:                appendArrayGenericType(sb, data.genericParameterTypes);
202:                sb.append(')');
203:                // append exeptions if any
204:                if (data.genericExceptionTypes.length > 0) {
205:                    sb.append(" throws ");
206:                    appendArrayGenericType(sb, data.genericExceptionTypes);
207:                }
208:                return sb.toString();
209:            }
210:
211:            /**
212:             * @com.intel.drl.spec_ref 
213:             */
214:            public boolean isSynthetic() {
215:                return (getModifiers() & ACC_SYNTHETIC) != 0;
216:            }
217:
218:            /**
219:             * @com.intel.drl.spec_ref 
220:             */
221:            public Object getDefaultValue() {
222:                return VMGenericsAndAnnotations
223:                        .getDefaultValue(data.vm_member_id);
224:            }
225:
226:            /**
227:             * cache of the method data
228:             */
229:            private final MethodData data;
230:
231:            /**
232:             * Copy constructor
233:             * 
234:             * @param m original method
235:             */
236:            Method(Method m) {
237:                data = m.data;
238:                isAccessible = m.isAccessible;
239:            }
240:
241:            /**
242:             * Only VM should call this constructor.
243:             * String parameters must be interned.
244:             * @api2vm
245:             */
246:            Method(long id, Class clss, String name, String desc, int m) {
247:                data = new MethodData(id, clss, name, desc, m);
248:            }
249:
250:            /**
251:             * Called by VM to obtain this method's handle.
252:             * 
253:             * @return handle for this method
254:             * @api2vm
255:             */
256:            long getId() {
257:                return data.vm_member_id;
258:            }
259:
260:            /**
261:             * @com.intel.drl.spec_ref 
262:             */
263:            public boolean equals(Object obj) {
264:                if (obj instanceof  Method) {
265:                    Method another = (Method) obj;
266:                    if (data.vm_member_id == another.data.vm_member_id) {
267:                        assert getDeclaringClass() == another
268:                                .getDeclaringClass()
269:                                && getName() == another.getName()
270:                                && getReturnType() == another.getReturnType()
271:                                && Arrays.equals(getParameterTypes(), another
272:                                        .getParameterTypes());
273:                        return true;
274:                    }
275:                }
276:                return false;
277:            }
278:
279:            /**
280:             * @com.intel.drl.spec_ref 
281:             */
282:            public Class<?> getDeclaringClass() {
283:                return data.declaringClass;
284:            }
285:
286:            /**
287:             * @com.intel.drl.spec_ref 
288:             */
289:            public Class<?>[] getExceptionTypes() {
290:                return (Class[]) data.getExceptionTypes().clone();
291:            }
292:
293:            /**
294:             * @com.intel.drl.spec_ref 
295:             */
296:            public int getModifiers() {
297:                return data.modifiers;
298:            }
299:
300:            /**
301:             * @com.intel.drl.spec_ref 
302:             */
303:            public String getName() {
304:                return data.name;
305:            }
306:
307:            /**
308:             * @com.intel.drl.spec_ref 
309:             */
310:            public Class<?>[] getParameterTypes() {
311:                return (Class[]) data.getParameterTypes().clone();
312:            }
313:
314:            /**
315:             * @com.intel.drl.spec_ref 
316:             */
317:            public Class<?> getReturnType() {
318:                return data.getReturnType();
319:            }
320:
321:            /**
322:             * @com.intel.drl.spec_ref 
323:             */
324:            public int hashCode() {
325:                return getDeclaringClass().getName().hashCode()
326:                        ^ getName().hashCode();
327:            }
328:
329:            /**
330:             * @com.intel.drl.spec_ref 
331:             */
332:            public Object invoke(Object obj, Object... args)
333:                    throws IllegalAccessException, IllegalArgumentException,
334:                    InvocationTargetException {
335:
336:                obj = checkObject(getDeclaringClass(), getModifiers(), obj);
337:
338:                // check parameter validity
339:                checkInvokationArguments(data.getParameterTypes(), args);
340:
341:                if (!isAccessible) {
342:                    reflectExporter.checkMemberAccess(
343:                            VMStack.getCallerClass(0), getDeclaringClass(),
344:                            obj == null ? getDeclaringClass() : obj.getClass(),
345:                            getModifiers());
346:                }
347:                return VMReflection.invokeMethod(data.vm_member_id, obj, args);
348:            }
349:
350:            /**
351:             * @com.intel.drl.spec_ref 
352:             */
353:            public String toString() {
354:                StringBuilder sb = new StringBuilder();
355:                // append modifiers if any
356:                int modifier = getModifiers();
357:                if (modifier != 0) {
358:                    // BRIDGE & VARARGS recognized incorrectly
359:                    final int MASK = ~(ACC_BRIDGE + ACC_VARARGS);
360:                    sb.append(Modifier.toString(modifier & MASK)).append(' ');
361:                }
362:                // append return type
363:                appendArrayType(sb, getReturnType());
364:                sb.append(' ');
365:                // append full method name
366:                sb.append(getDeclaringClass().getName()).append('.').append(
367:                        getName());
368:                // append parameters
369:                sb.append('(');
370:                appendArrayType(sb, data.getParameterTypes());
371:                sb.append(')');
372:                // append exeptions if any
373:                Class[] exn = data.getExceptionTypes();
374:                if (exn.length > 0) {
375:                    sb.append(" throws ");
376:                    appendSimpleType(sb, exn);
377:                }
378:                return sb.toString();
379:            }
380:
381:            /* NON API SECTION */
382:
383:            /**
384:             * This method is required by serialization mechanism.
385:             * 
386:             * @return the signature of the method 
387:             */
388:            String getSignature() {
389:                return data.descriptor;
390:            }
391:
392:            /**
393:             * Keeps an information about this method
394:             */
395:            private class MethodData {
396:
397:                /**
398:                 * method handle which is used to retrieve all necessary information
399:                 * about this method object
400:                 */
401:                final long vm_member_id;
402:
403:                Annotation[] declaredAnnotations;
404:
405:                final Class<?> declaringClass;
406:
407:                private Class<?>[] exceptionTypes;
408:
409:                Type[] genericExceptionTypes;
410:
411:                Type[] genericParameterTypes;
412:
413:                Type genericReturnType;
414:
415:                String methSignature;
416:
417:                final int modifiers;
418:
419:                final String name;
420:
421:                final String descriptor;
422:
423:                /**
424:                 * declared method annotations
425:                 */
426:                Annotation[][] parameterAnnotations;
427:
428:                /**
429:                 * method parameters
430:                 */
431:                Class<?>[] parameterTypes;
432:
433:                /** 
434:                 * method return type
435:                 */
436:                private Class<?> returnType;
437:
438:                /**
439:                 * method type parameters
440:                 */
441:                TypeVariable<Method>[] typeParameters;
442:
443:                /**
444:                 * @param obj method handler
445:                 */
446:                public MethodData(long vm_id, Class clss, String name,
447:                        String desc, int mods) {
448:                    vm_member_id = vm_id;
449:                    declaringClass = clss;
450:                    this .name = name;
451:                    modifiers = mods;
452:                    descriptor = desc;
453:                }
454:
455:                public Annotation[] getDeclaredAnnotations() {
456:                    if (declaredAnnotations == null) {
457:                        declaredAnnotations = VMGenericsAndAnnotations
458:                                .getDeclaredAnnotations(vm_member_id);
459:                    }
460:                    return declaredAnnotations;
461:                }
462:
463:                /**
464:                 * initializes exeptions
465:                 */
466:                public Class<?>[] getExceptionTypes() {
467:                    if (exceptionTypes == null) {
468:                        exceptionTypes = VMReflection
469:                                .getExceptionTypes(vm_member_id);
470:                    }
471:                    return exceptionTypes;
472:                }
473:
474:                public Annotation[][] getParameterAnnotations() {
475:                    if (parameterAnnotations == null) {
476:                        parameterAnnotations = VMGenericsAndAnnotations
477:                                .getParameterAnnotations(vm_member_id);
478:                    }
479:                    return parameterAnnotations;
480:                }
481:
482:                /**
483:                 * initializes parameters
484:                 */
485:                public Class[] getParameterTypes() {
486:                    if (parameterTypes == null) {
487:                        parameterTypes = VMReflection
488:                                .getParameterTypes(vm_member_id);
489:                    }
490:                    return parameterTypes;
491:                }
492:
493:                /**
494:                 * initializes return type
495:                 */
496:                public Class<?> getReturnType() {
497:                    if (returnType == null) {
498:                        returnType = VMReflection
499:                                .getMethodReturnType(vm_member_id);
500:                    }
501:                    return returnType;
502:                }
503:            }
504:        }
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