Source Code Cross Referenced for MethodMatchers.java in  » J2EE » spring-framework-2.5 » org » springframework » aop » support » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.aop.support 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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.support;
018:
019:        import java.io.Serializable;
020:        import java.lang.reflect.Method;
021:
022:        import org.springframework.aop.ClassFilter;
023:        import org.springframework.aop.IntroductionAwareMethodMatcher;
024:        import org.springframework.aop.MethodMatcher;
025:        import org.springframework.util.Assert;
026:
027:        /**
028:         * Static utility methods for composing
029:         * {@link org.springframework.aop.MethodMatcher MethodMatchers}.
030:         *
031:         * <p>A MethodMatcher may be evaluated statically (based on method
032:         * and target class) or need further evaluation dynamically
033:         * (based on arguments at the time of method invocation).
034:         *
035:         * @author Rod Johnson
036:         * @author Rob Harrop
037:         * @author Juergen Hoeller
038:         * @since 11.11.2003
039:         * @see ClassFilters
040:         * @see Pointcuts
041:         */
042:        public abstract class MethodMatchers {
043:
044:            /**
045:             * Match all methods that <i>either</i> (or both) of the given MethodMatchers matches.
046:             * @param mm1 the first MethodMatcher
047:             * @param mm2 the second MethodMatcher
048:             * @return a distinct MethodMatcher that matches all methods that either
049:             * of the given MethodMatchers matches
050:             */
051:            public static MethodMatcher union(MethodMatcher mm1,
052:                    MethodMatcher mm2) {
053:                return new UnionMethodMatcher(mm1, mm2);
054:            }
055:
056:            /**
057:             * Match all methods that <i>either</i> (or both) of the given MethodMatchers matches.
058:             * @param mm1 the first MethodMatcher
059:             * @param cf1 the corresponding ClassFilter for the first MethodMatcher
060:             * @param mm2 the second MethodMatcher
061:             * @param cf2 the corresponding ClassFilter for the second MethodMatcher
062:             * @return a distinct MethodMatcher that matches all methods that either
063:             * of the given MethodMatchers matches
064:             */
065:            static MethodMatcher union(MethodMatcher mm1, ClassFilter cf1,
066:                    MethodMatcher mm2, ClassFilter cf2) {
067:                return new ClassFilterAwareUnionMethodMatcher(mm1, cf1, mm2,
068:                        cf2);
069:            }
070:
071:            /**
072:             * Match all methods that <i>both</i> of the given MethodMatchers match.
073:             * @param mm1 the first MethodMatcher
074:             * @param mm2 the second MethodMatcher
075:             * @return a distinct MethodMatcher that matches all methods that both
076:             * of the given MethodMatchers match
077:             */
078:            public static MethodMatcher intersection(MethodMatcher mm1,
079:                    MethodMatcher mm2) {
080:                return new IntersectionMethodMatcher(mm1, mm2);
081:            }
082:
083:            /**
084:             * Apply the given MethodMatcher to the given Method, supporting an
085:             * {@link org.springframework.aop.IntroductionAwareMethodMatcher}
086:             * (if applicable).
087:             * @param mm the MethodMatcher to apply (may be an IntroductionAwareMethodMatcher)
088:             * @param method the candidate method
089:             * @param targetClass the target class (may be <code>null</code>, in which case
090:             * the candidate class must be taken to be the method's declaring class)
091:             * @param hasIntroductions <code>true</code> if the object on whose behalf we are
092:             * asking is the subject on one or more introductions; <code>false</code> otherwise
093:             * @return whether or not this method matches statically
094:             */
095:            public static boolean matches(MethodMatcher mm, Method method,
096:                    Class targetClass, boolean hasIntroductions) {
097:                Assert.notNull(mm, "MethodMatcher must not be null");
098:                return ((mm instanceof  IntroductionAwareMethodMatcher && ((IntroductionAwareMethodMatcher) mm)
099:                        .matches(method, targetClass, hasIntroductions)) || mm
100:                        .matches(method, targetClass));
101:            }
102:
103:            /**
104:             * MethodMatcher implementation for a union of two given MethodMatchers.
105:             */
106:            private static class UnionMethodMatcher implements 
107:                    IntroductionAwareMethodMatcher, Serializable {
108:
109:                private MethodMatcher mm1;
110:                private MethodMatcher mm2;
111:
112:                public UnionMethodMatcher(MethodMatcher mm1, MethodMatcher mm2) {
113:                    Assert.notNull(mm1, "First MethodMatcher must not be null");
114:                    Assert
115:                            .notNull(mm2,
116:                                    "Second MethodMatcher must not be null");
117:                    this .mm1 = mm1;
118:                    this .mm2 = mm2;
119:                }
120:
121:                public boolean matches(Method method, Class targetClass,
122:                        boolean hasIntroductions) {
123:                    return (matchesClass1(targetClass) && MethodMatchers
124:                            .matches(this .mm1, method, targetClass,
125:                                    hasIntroductions))
126:                            || (matchesClass2(targetClass) && MethodMatchers
127:                                    .matches(this .mm2, method, targetClass,
128:                                            hasIntroductions));
129:                }
130:
131:                public boolean matches(Method method, Class targetClass) {
132:                    return (matchesClass1(targetClass) && this .mm1.matches(
133:                            method, targetClass))
134:                            || (matchesClass2(targetClass) && this .mm2.matches(
135:                                    method, targetClass));
136:                }
137:
138:                protected boolean matchesClass1(Class targetClass) {
139:                    return true;
140:                }
141:
142:                protected boolean matchesClass2(Class targetClass) {
143:                    return true;
144:                }
145:
146:                public boolean isRuntime() {
147:                    return this .mm1.isRuntime() || this .mm2.isRuntime();
148:                }
149:
150:                public boolean matches(Method method, Class targetClass,
151:                        Object[] args) {
152:                    return this .mm1.matches(method, targetClass, args)
153:                            || this .mm2.matches(method, targetClass, args);
154:                }
155:
156:                public boolean equals(Object obj) {
157:                    if (this  == obj) {
158:                        return true;
159:                    }
160:                    if (!(obj instanceof  UnionMethodMatcher)) {
161:                        return false;
162:                    }
163:                    UnionMethodMatcher that = (UnionMethodMatcher) obj;
164:                    return (this .mm1.equals(that.mm1) && this .mm2
165:                            .equals(that.mm2));
166:                }
167:
168:                public int hashCode() {
169:                    int hashCode = 17;
170:                    hashCode = 37 * hashCode + this .mm1.hashCode();
171:                    hashCode = 37 * hashCode + this .mm2.hashCode();
172:                    return hashCode;
173:                }
174:            }
175:
176:            /**
177:             * MethodMatcher implementation for a union of two given MethodMatchers,
178:             * supporting an associated ClassFilter per MethodMatcher.
179:             */
180:            private static class ClassFilterAwareUnionMethodMatcher extends
181:                    UnionMethodMatcher {
182:
183:                private final ClassFilter cf1;
184:                private final ClassFilter cf2;
185:
186:                public ClassFilterAwareUnionMethodMatcher(MethodMatcher mm1,
187:                        ClassFilter cf1, MethodMatcher mm2, ClassFilter cf2) {
188:                    super (mm1, mm2);
189:                    this .cf1 = cf1;
190:                    this .cf2 = cf2;
191:                }
192:
193:                protected boolean matchesClass1(Class targetClass) {
194:                    return this .cf1.matches(targetClass);
195:                }
196:
197:                protected boolean matchesClass2(Class targetClass) {
198:                    return this .cf2.matches(targetClass);
199:                }
200:
201:                public boolean equals(Object other) {
202:                    if (this  == other) {
203:                        return true;
204:                    }
205:                    if (!(other instanceof  ClassFilterAwareUnionMethodMatcher)) {
206:                        return false;
207:                    }
208:                    ClassFilterAwareUnionMethodMatcher that = (ClassFilterAwareUnionMethodMatcher) other;
209:                    return (this .cf1.equals(that.cf1)
210:                            && this .cf2.equals(that.cf2) && super .equals(other));
211:                }
212:            }
213:
214:            /**
215:             * MethodMatcher implementation for an intersection of two given MethodMatchers.
216:             */
217:            private static class IntersectionMethodMatcher implements 
218:                    IntroductionAwareMethodMatcher, Serializable {
219:
220:                private MethodMatcher mm1;
221:                private MethodMatcher mm2;
222:
223:                public IntersectionMethodMatcher(MethodMatcher mm1,
224:                        MethodMatcher mm2) {
225:                    Assert.notNull(mm1, "First MethodMatcher must not be null");
226:                    Assert
227:                            .notNull(mm2,
228:                                    "Second MethodMatcher must not be null");
229:                    this .mm1 = mm1;
230:                    this .mm2 = mm2;
231:                }
232:
233:                public boolean matches(Method method, Class targetClass,
234:                        boolean hasIntroductions) {
235:                    return MethodMatchers.matches(this .mm1, method,
236:                            targetClass, hasIntroductions)
237:                            && MethodMatchers.matches(this .mm2, method,
238:                                    targetClass, hasIntroductions);
239:                }
240:
241:                public boolean matches(Method method, Class targetClass) {
242:                    return this .mm1.matches(method, targetClass)
243:                            && this .mm2.matches(method, targetClass);
244:                }
245:
246:                public boolean isRuntime() {
247:                    return this .mm1.isRuntime() || this .mm2.isRuntime();
248:                }
249:
250:                public boolean matches(Method method, Class targetClass,
251:                        Object[] args) {
252:                    // Because a dynamic intersection may be composed of a static and dynamic part,
253:                    // we must avoid calling the 3-arg matches method on a dynamic matcher, as
254:                    // it will probably be an unsupported operation.
255:                    boolean aMatches = this .mm1.isRuntime() ? this .mm1.matches(
256:                            method, targetClass, args) : this .mm1.matches(
257:                            method, targetClass);
258:                    boolean bMatches = this .mm2.isRuntime() ? this .mm2.matches(
259:                            method, targetClass, args) : this .mm2.matches(
260:                            method, targetClass);
261:                    return aMatches && bMatches;
262:                }
263:
264:                public boolean equals(Object other) {
265:                    if (this  == other) {
266:                        return true;
267:                    }
268:                    if (!(other instanceof  IntersectionMethodMatcher)) {
269:                        return false;
270:                    }
271:                    IntersectionMethodMatcher that = (IntersectionMethodMatcher) other;
272:                    return (this .mm1.equals(that.mm1) && this .mm2
273:                            .equals(that.mm2));
274:                }
275:
276:                public int hashCode() {
277:                    int hashCode = 17;
278:                    hashCode = 37 * hashCode + this .mm1.hashCode();
279:                    hashCode = 37 * hashCode + this.mm2.hashCode();
280:                    return hashCode;
281:                }
282:            }
283:
284:        }
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