001: /*
002: * Copyright 2002-2007 the original author or authors.
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: */
016:
017: package org.springframework.aop.framework.adapter;
018:
019: import java.util.ArrayList;
020: import java.util.List;
021:
022: import org.aopalliance.aop.Advice;
023: import org.aopalliance.intercept.MethodInterceptor;
024:
025: import org.springframework.aop.Advisor;
026: import org.springframework.aop.support.DefaultPointcutAdvisor;
027:
028: /**
029: * Default implementation of the {@link AdvisorAdapterRegistry} interface.
030: * Supports {@link org.aopalliance.intercept.MethodInterceptor},
031: * {@link org.springframework.aop.MethodBeforeAdvice},
032: * {@link org.springframework.aop.AfterReturningAdvice},
033: * {@link org.springframework.aop.ThrowsAdvice}.
034: *
035: * @author Rod Johnson
036: * @author Rob Harrop
037: */
038: public class DefaultAdvisorAdapterRegistry implements
039: AdvisorAdapterRegistry {
040:
041: private final List adapters = new ArrayList(3);
042:
043: /**
044: * Create a new DefaultAdvisorAdapterRegistry, registering well-known adapters.
045: */
046: public DefaultAdvisorAdapterRegistry() {
047: registerAdvisorAdapter(new MethodBeforeAdviceAdapter());
048: registerAdvisorAdapter(new AfterReturningAdviceAdapter());
049: registerAdvisorAdapter(new ThrowsAdviceAdapter());
050: }
051:
052: public Advisor wrap(Object adviceObject)
053: throws UnknownAdviceTypeException {
054: if (adviceObject instanceof Advisor) {
055: return (Advisor) adviceObject;
056: }
057: if (!(adviceObject instanceof Advice)) {
058: throw new UnknownAdviceTypeException(adviceObject);
059: }
060: Advice advice = (Advice) adviceObject;
061: if (advice instanceof MethodInterceptor) {
062: // So well-known it doesn't even need an adapter.
063: return new DefaultPointcutAdvisor(advice);
064: }
065: for (int i = 0; i < this .adapters.size(); i++) {
066: // Check that it is supported.
067: AdvisorAdapter adapter = (AdvisorAdapter) this .adapters
068: .get(i);
069: if (adapter.supportsAdvice(advice)) {
070: return new DefaultPointcutAdvisor(advice);
071: }
072: }
073: throw new UnknownAdviceTypeException(advice);
074: }
075:
076: public MethodInterceptor[] getInterceptors(Advisor advisor)
077: throws UnknownAdviceTypeException {
078: List interceptors = new ArrayList(3);
079: Advice advice = advisor.getAdvice();
080: if (advice instanceof MethodInterceptor) {
081: interceptors.add(advice);
082: }
083: for (int i = 0; i < this .adapters.size(); i++) {
084: AdvisorAdapter adapter = (AdvisorAdapter) this .adapters
085: .get(i);
086: if (adapter.supportsAdvice(advice)) {
087: interceptors.add(adapter.getInterceptor(advisor));
088: }
089: }
090: if (interceptors.isEmpty()) {
091: throw new UnknownAdviceTypeException(advisor.getAdvice());
092: }
093: return (MethodInterceptor[]) interceptors
094: .toArray(new MethodInterceptor[interceptors.size()]);
095: }
096:
097: public void registerAdvisorAdapter(AdvisorAdapter adapter) {
098: this.adapters.add(adapter);
099: }
100:
101: }
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