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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 2002-2006 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.MethodMatcher;
024:        import org.springframework.aop.Pointcut;
025:        import org.springframework.core.ControlFlow;
026:        import org.springframework.core.ControlFlowFactory;
027:        import org.springframework.util.Assert;
028:        import org.springframework.util.ObjectUtils;
029:
030:        /**
031:         * Pointcut and method matcher for use in simple <b>cflow</b>-style pointcut.
032:         * Note that evaluating such pointcuts is 10-15 times slower than evaluating
033:         * normal pointcuts, but they are useful in some cases.
034:         *
035:         * @author Rod Johnson
036:         * @author Rob Harrop
037:         * @see org.springframework.core.ControlFlow
038:         */
039:        public class ControlFlowPointcut implements  Pointcut, ClassFilter,
040:                MethodMatcher, Serializable {
041:
042:            private Class clazz;
043:
044:            private String methodName;
045:
046:            private int evaluations;
047:
048:            /**
049:             * Construct a new pointcut that matches all control flows below that class.
050:             * @param clazz the clazz
051:             */
052:            public ControlFlowPointcut(Class clazz) {
053:                this (clazz, null);
054:            }
055:
056:            /**
057:             * Construct a new pointcut that matches all calls below the
058:             * given method in the given class. If the method name is null,
059:             * matches all control flows below that class.
060:             * @param clazz the clazz
061:             * @param methodName the name of the method
062:             */
063:            public ControlFlowPointcut(Class clazz, String methodName) {
064:                Assert.notNull(clazz, "Class must not be null");
065:                this .clazz = clazz;
066:                this .methodName = methodName;
067:            }
068:
069:            /**
070:             * Subclasses can override this for greater filtering (and performance).
071:             */
072:            public boolean matches(Class clazz) {
073:                return true;
074:            }
075:
076:            /**
077:             * Subclasses can override this if it's possible to filter out
078:             * some candidate classes.
079:             */
080:            public boolean matches(Method method, Class targetClass) {
081:                return true;
082:            }
083:
084:            public boolean isRuntime() {
085:                return true;
086:            }
087:
088:            public boolean matches(Method method, Class targetClass,
089:                    Object[] args) {
090:                ++this .evaluations;
091:                ControlFlow cflow = ControlFlowFactory.createControlFlow();
092:                return (this .methodName != null) ? cflow.under(this .clazz,
093:                        this .methodName) : cflow.under(this .clazz);
094:            }
095:
096:            /**
097:             * It's useful to know how many times we've fired, for optimization.
098:             */
099:            public int getEvaluations() {
100:                return evaluations;
101:            }
102:
103:            public ClassFilter getClassFilter() {
104:                return this ;
105:            }
106:
107:            public MethodMatcher getMethodMatcher() {
108:                return this ;
109:            }
110:
111:            public boolean equals(Object other) {
112:                if (this  == other) {
113:                    return true;
114:                }
115:                if (!(other instanceof  ControlFlowPointcut)) {
116:                    return false;
117:                }
118:                ControlFlowPointcut that = (ControlFlowPointcut) other;
119:                return (this .clazz.equals(that.clazz))
120:                        && ObjectUtils.nullSafeEquals(that.methodName,
121:                                this .methodName);
122:            }
123:
124:            public int hashCode() {
125:                int code = 17;
126:                code = 37 * code + this .clazz.hashCode();
127:                if (this .methodName != null) {
128:                    code = 37 * code + this.methodName.hashCode();
129:                }
130:                return code;
131:            }
132:
133:        }
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