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Java Source Code / Java Documentation » Testing » Ejb3Unit » com.bm.ejb3guice.inject 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Copyright (C) 2006 Google Inc.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         * http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */package com.bm.ejb3guice.inject;
016:
017:        import com.bm.ejb3guice.internal.Annotations;
018:        import com.bm.ejb3guice.internal.StackTraceElements;
019:        import com.bm.ejb3guice.internal.ToStringBuilder;
020:
021:        import static com.bm.ejb3guice.internal.Objects.nonNull;
022:
023:        import java.lang.annotation.Annotation;
024:        import java.lang.reflect.Member;
025:        import java.lang.reflect.Type;
026:
027:        /**
028:         * Binding key consisting of an injection type and an optional annotation.
029:         * Matches the type and annotation at a point of injection.
030:         *
031:         * <p>For example, {@code Key.get(Service.class, Transactional.class)} will
032:         * match:
033:         *
034:         * <pre>
035:         *   {@literal @}Inject
036:         *   public void setService({@literal @}Transactional Service service) {
037:         *     ...
038:         *   }
039:         * </pre>
040:         *
041:         * <p>{@code Key} supports generic types via subclassing just like {@link
042:         * TypeLiteral}.
043:         *
044:         * @author crazybob@google.com (Bob Lee)
045:         */
046:        public abstract class Key<T> {
047:
048:            final AnnotationStrategy annotationStrategy;
049:
050:            final TypeLiteral<T> typeLiteral;
051:            final int hashCode;
052:
053:            /**
054:             * Constructs a new key. Derives the type from this class's type parameter.
055:             *
056:             * <p>Clients create an empty anonymous subclass. Doing so embeds the type
057:             * parameter in the anonymous class's type hierarchy so we can reconstitute it
058:             * at runtime despite erasure.
059:             *
060:             * <p>Example usage for a binding of type {@code Foo} annotated with
061:             * {@code @Bar}:
062:             *
063:             * <p>{@code new Key<Foo>(Bar.class) {}}.
064:             */
065:            @SuppressWarnings("unchecked")
066:            protected Key(Class<? extends Annotation> annotationType) {
067:                this .annotationStrategy = strategyFor(annotationType);
068:                this .typeLiteral = (TypeLiteral<T>) TypeLiteral
069:                        .fromSuperclassTypeParameter(getClass());
070:                this .hashCode = computeHashCode();
071:            }
072:
073:            /**
074:             * Constructs a new key. Derives the type from this class's type parameter.
075:             *
076:             * <p>Clients create an empty anonymous subclass. Doing so embeds the type
077:             * parameter in the anonymous class's type hierarchy so we can reconstitute it
078:             * at runtime despite erasure.
079:             *
080:             * <p>Example usage for a binding of type {@code Foo} annotated with
081:             * {@code @Bar}:
082:             *
083:             * <p>{@code new Key<Foo>(new Bar()) {}}.
084:             */
085:            @SuppressWarnings("unchecked")
086:            protected Key(Annotation annotation) {
087:                // no usages, not test-covered
088:                this .annotationStrategy = strategyFor(annotation);
089:                this .typeLiteral = (TypeLiteral<T>) TypeLiteral
090:                        .fromSuperclassTypeParameter(getClass());
091:                this .hashCode = computeHashCode();
092:            }
093:
094:            /**
095:             * Constructs a new key. Derives the type from this class's type parameter.
096:             *
097:             * <p>Clients create an empty anonymous subclass. Doing so embeds the type
098:             * parameter in the anonymous class's type hierarchy so we can reconstitute it
099:             * at runtime despite erasure.
100:             *
101:             * <p>Example usage for a binding of type {@code Foo}:
102:             *
103:             * <p>{@code new Key<Foo>() {}}.
104:             */
105:            @SuppressWarnings("unchecked")
106:            protected Key() {
107:                this .annotationStrategy = NULL_STRATEGY;
108:                this .typeLiteral = (TypeLiteral<T>) TypeLiteral
109:                        .fromSuperclassTypeParameter(getClass());
110:                this .hashCode = computeHashCode();
111:            }
112:
113:            /**
114:             * Unsafe. Constructs a key from a manually specified type.
115:             */
116:            @SuppressWarnings("unchecked")
117:            private Key(Type type, AnnotationStrategy annotationStrategy) {
118:                this .annotationStrategy = annotationStrategy;
119:                this .typeLiteral = (TypeLiteral<T>) TypeLiteral.get(type);
120:                this .hashCode = computeHashCode();
121:            }
122:
123:            /** Constructs a key from a manually specified type. */
124:            private Key(TypeLiteral<T> typeLiteral,
125:                    AnnotationStrategy annotationStrategy) {
126:                this .annotationStrategy = annotationStrategy;
127:                this .typeLiteral = typeLiteral;
128:                this .hashCode = computeHashCode();
129:            }
130:
131:            private int computeHashCode() {
132:                return typeLiteral.hashCode() * 31
133:                        + annotationStrategy.hashCode();
134:            }
135:
136:            /**
137:             * Gets the key type.
138:             */
139:            public TypeLiteral<T> getTypeLiteral() {
140:                return typeLiteral;
141:            }
142:
143:            /**
144:             * Gets the annotation type.
145:             */
146:            public Class<? extends Annotation> getAnnotationType() {
147:                return annotationStrategy.getAnnotationType();
148:            }
149:
150:            /**
151:             * Gets the annotation.
152:             */
153:            public Annotation getAnnotation() {
154:                return annotationStrategy.getAnnotation();
155:            }
156:
157:            boolean hasAnnotationType() {
158:                return annotationStrategy.getAnnotationType() != null;
159:            }
160:
161:            String getAnnotationName() {
162:                Annotation annotation = annotationStrategy.getAnnotation();
163:                if (annotation != null) {
164:                    return annotation.toString();
165:                }
166:
167:                // not test-covered
168:                return annotationStrategy.getAnnotationType().toString();
169:            }
170:
171:            public int hashCode() {
172:                return this .hashCode;
173:            }
174:
175:            Class<? super  T> getRawType() {
176:                return typeLiteral.getRawType();
177:            }
178:
179:            public boolean equals(Object o) {
180:                if (o == this ) {
181:                    return true;
182:                }
183:                if (!(o instanceof  Key<?>)) {
184:                    return false;
185:                }
186:                Key<?> other = (Key<?>) o;
187:                return annotationStrategy.equals(other.annotationStrategy)
188:                        && typeLiteral.equals(other.typeLiteral);
189:            }
190:
191:            public String toString() {
192:                return new ToStringBuilder(Key.class).add("type", typeLiteral)
193:                        .add("annotation", annotationStrategy).toString();
194:            }
195:
196:            /**
197:             * Gets a key for an injection type and an annotation strategy.
198:             */
199:            static <T> Key<T> get(Class<T> type,
200:                    AnnotationStrategy annotationStrategy) {
201:                return new SimpleKey<T>(type, annotationStrategy);
202:            }
203:
204:            /**
205:             * Gets a key for an injection type.
206:             */
207:            public static <T> Key<T> get(Class<T> type) {
208:                return new SimpleKey<T>(type, NULL_STRATEGY);
209:            }
210:
211:            /**
212:             * Gets a key for an injection type and an annotation type.
213:             */
214:            public static <T> Key<T> get(Class<T> type,
215:                    Class<? extends Annotation> annotationType) {
216:                return new SimpleKey<T>(type, strategyFor(annotationType));
217:            }
218:
219:            /**
220:             * Gets a key for an injection type and an annotation.
221:             */
222:            public static <T> Key<T> get(Class<T> type, Annotation annotation) {
223:                return new SimpleKey<T>(type, strategyFor(annotation));
224:            }
225:
226:            /**
227:             * Gets a key for an injection type.
228:             */
229:            public static Key<?> get(Type type) {
230:                return new SimpleKey<Object>(type, NULL_STRATEGY);
231:            }
232:
233:            /**
234:             * Gets a key for an injection type and an annotation type.
235:             */
236:            public static Key<?> get(Type type,
237:                    Class<? extends Annotation> annotationType) {
238:                return new SimpleKey<Object>(type, strategyFor(annotationType));
239:            }
240:
241:            /**
242:             * Gets a key for an injection type and an annotation.
243:             */
244:            public static Key<?> get(Type type, Annotation annotation) {
245:                return new SimpleKey<Object>(type, strategyFor(annotation));
246:            }
247:
248:            /**
249:             * Gets a key for an injection type.
250:             */
251:            public static <T> Key<T> get(TypeLiteral<T> typeLiteral) {
252:                return new SimpleKey<T>(typeLiteral, NULL_STRATEGY);
253:            }
254:
255:            /**
256:             * Gets a key for an injection type and an annotation type.
257:             */
258:            public static <T> Key<T> get(TypeLiteral<T> typeLiteral,
259:                    Class<? extends Annotation> annotationType) {
260:                return new SimpleKey<T>(typeLiteral,
261:                        strategyFor(annotationType));
262:            }
263:
264:            /**
265:             * Gets a key for an injection type and an annotation.
266:             */
267:            public static <T> Key<T> get(TypeLiteral<T> typeLiteral,
268:                    Annotation annotation) {
269:                return new SimpleKey<T>(typeLiteral, strategyFor(annotation));
270:            }
271:
272:            /**
273:             * Gets a key for the given type, member and annotations.
274:             */
275:            static Key<?> get(Type type, Member member,
276:                    Annotation[] annotations, ErrorHandler errorHandler) {
277:                Annotation found = null;
278:                for (Annotation annotation : annotations) {
279:                    if (annotation.annotationType().getAnnotation(
280:                            BindingAnnotation.class) != null) {
281:                        if (found == null) {
282:                            found = annotation;
283:                        } else {
284:                            errorHandler
285:                                    .handle(
286:                                            StackTraceElements
287:                                                    .forMember(member),
288:                                            ErrorMessages.DUPLICATE_BINDING_ANNOTATIONS,
289:                                            found, annotation);
290:                        }
291:                    }
292:                }
293:                Key<?> key = found == null ? Key.get(type) : Key.get(type,
294:                        found);
295:                return key;
296:            }
297:
298:            /**
299:             * Returns a new key of the specified type with the same annotation as this
300:             * key.
301:             */
302:            <T> Key<T> ofType(Class<T> type) {
303:                return new SimpleKey<T>(type, annotationStrategy);
304:            }
305:
306:            /**
307:             * Returns a new key of the specified type with the same annotation as this
308:             * key.
309:             */
310:            Key<?> ofType(Type type) {
311:                return new SimpleKey<Object>(type, annotationStrategy);
312:            }
313:
314:            /**
315:             * Returns true if this key has annotation attributes.
316:             * @return
317:             */
318:            boolean hasAttributes() {
319:                return annotationStrategy.hasAttributes();
320:            }
321:
322:            /**
323:             * Returns this key without annotation attributes, i.e. with only the
324:             * annotation type.
325:             */
326:            Key<T> withoutAttributes() {
327:                return new SimpleKey<T>(typeLiteral, annotationStrategy
328:                        .withoutAttributes());
329:            }
330:
331:            private static class SimpleKey<T> extends Key<T> {
332:
333:                private SimpleKey(Type type,
334:                        AnnotationStrategy annotationStrategy) {
335:                    super (type, annotationStrategy);
336:                }
337:
338:                private SimpleKey(TypeLiteral<T> typeLiteral,
339:                        AnnotationStrategy annotationStrategy) {
340:                    super (typeLiteral, annotationStrategy);
341:                }
342:            }
343:
344:            interface AnnotationStrategy {
345:
346:                Annotation getAnnotation();
347:
348:                Class<? extends Annotation> getAnnotationType();
349:
350:                boolean hasAttributes();
351:
352:                AnnotationStrategy withoutAttributes();
353:            }
354:
355:            static final AnnotationStrategy NULL_STRATEGY = new AnnotationStrategy() {
356:
357:                public boolean hasAttributes() {
358:                    return false;
359:                }
360:
361:                public AnnotationStrategy withoutAttributes() {
362:                    throw new UnsupportedOperationException(
363:                            "Key already has no attributes.");
364:                }
365:
366:                public Annotation getAnnotation() {
367:                    return null;
368:                }
369:
370:                public Class<? extends Annotation> getAnnotationType() {
371:                    return null;
372:                }
373:
374:                public boolean equals(Object o) {
375:                    return o == NULL_STRATEGY;
376:                }
377:
378:                public int hashCode() {
379:                    return 0;
380:                }
381:
382:                public String toString() {
383:                    return "[none]";
384:                }
385:            };
386:
387:            /**
388:             * Returns {@code true} if the given annotation type has no attributes.
389:             */
390:            static boolean isMarker(Class<? extends Annotation> annotationType) {
391:                return annotationType.getDeclaredMethods().length == 0;
392:            }
393:
394:            /**
395:             * Gets the strategy for an annotation.
396:             */
397:            static AnnotationStrategy strategyFor(Annotation annotation) {
398:                nonNull(annotation, "annotation");
399:                Class<? extends Annotation> annotationType = annotation
400:                        .annotationType();
401:                ensureRetainedAtRuntime(annotationType);
402:                ensureIsBindingAnnotation(annotationType);
403:
404:                if (annotationType.getDeclaredMethods().length == 0) {
405:                    return new AnnotationTypeStrategy(annotationType,
406:                            annotation);
407:                }
408:
409:                return new AnnotationInstanceStrategy(annotation);
410:            }
411:
412:            /**
413:             * Gets the strategy for an annotation type.
414:             */
415:            static AnnotationStrategy strategyFor(
416:                    Class<? extends Annotation> annotationType) {
417:                nonNull(annotationType, "annotation type");
418:                ensureRetainedAtRuntime(annotationType);
419:                ensureIsBindingAnnotation(annotationType);
420:                return new AnnotationTypeStrategy(annotationType, null);
421:            }
422:
423:            private static void ensureRetainedAtRuntime(
424:                    Class<? extends Annotation> annotationType) {
425:                if (!Annotations.isRetainedAtRuntime(annotationType)) {
426:                    throw new IllegalArgumentException(annotationType.getName()
427:                            + " is not retained at runtime."
428:                            + " Please annotate it with @Retention(RUNTIME).");
429:                }
430:            }
431:
432:            private static void ensureIsBindingAnnotation(
433:                    Class<? extends Annotation> annotationType) {
434:                if (!isBindingAnnotation(annotationType)) {
435:                    throw new IllegalArgumentException(annotationType.getName()
436:                            + " is not a binding annotation."
437:                            + " Please annotate it with @BindingAnnotation.");
438:                }
439:            }
440:
441:            // this class not test-covered
442:            static class AnnotationInstanceStrategy implements 
443:                    AnnotationStrategy {
444:
445:                final Annotation annotation;
446:
447:                AnnotationInstanceStrategy(Annotation annotation) {
448:                    this .annotation = nonNull(annotation, "annotation");
449:                }
450:
451:                public boolean hasAttributes() {
452:                    return true;
453:                }
454:
455:                public AnnotationStrategy withoutAttributes() {
456:                    return new AnnotationTypeStrategy(getAnnotationType(),
457:                            annotation);
458:                }
459:
460:                public Annotation getAnnotation() {
461:                    return annotation;
462:                }
463:
464:                public Class<? extends Annotation> getAnnotationType() {
465:                    return annotation.annotationType();
466:                }
467:
468:                public boolean equals(Object o) {
469:                    if (!(o instanceof  AnnotationInstanceStrategy)) {
470:                        return false;
471:                    }
472:
473:                    AnnotationInstanceStrategy other = (AnnotationInstanceStrategy) o;
474:                    return annotation.equals(other.annotation);
475:                }
476:
477:                public int hashCode() {
478:                    return annotation.hashCode();
479:                }
480:
481:                public String toString() {
482:                    return annotation.toString();
483:                }
484:            }
485:
486:            static class AnnotationTypeStrategy implements  AnnotationStrategy {
487:
488:                final Class<? extends Annotation> annotationType;
489:
490:                // Keep the instance around if we have it so the client can request it.
491:                final Annotation annotation;
492:
493:                AnnotationTypeStrategy(
494:                        Class<? extends Annotation> annotationType,
495:                        Annotation annotation) {
496:                    this .annotationType = nonNull(annotationType,
497:                            "annotation type");
498:                    this .annotation = annotation;
499:                }
500:
501:                public boolean hasAttributes() {
502:                    return false;
503:                }
504:
505:                public AnnotationStrategy withoutAttributes() {
506:                    throw new UnsupportedOperationException(
507:                            "Key already has no attributes.");
508:                }
509:
510:                public Annotation getAnnotation() {
511:                    return annotation;
512:                }
513:
514:                public Class<? extends Annotation> getAnnotationType() {
515:                    return annotationType;
516:                }
517:
518:                public boolean equals(Object o) {
519:                    if (!(o instanceof  AnnotationTypeStrategy)) {
520:                        return false;
521:                    }
522:
523:                    AnnotationTypeStrategy other = (AnnotationTypeStrategy) o;
524:                    return annotationType.equals(other.annotationType);
525:                }
526:
527:                public int hashCode() {
528:                    return annotationType.hashCode();
529:                }
530:
531:                public String toString() {
532:                    return "@" + annotationType.getName();
533:                }
534:            }
535:
536:            static boolean isBindingAnnotation(Annotation annotation) {
537:                return isBindingAnnotation(annotation.annotationType());
538:            }
539:
540:            static boolean isBindingAnnotation(
541:                    Class<? extends Annotation> annotationType) {
542:                return annotationType
543:                        .isAnnotationPresent(BindingAnnotation.class);
544:            }
545:        }
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