Source Code Cross Referenced for MethodMatcher.java in  » J2EE » spring-framework-2.0.6 » org » springframework » aop » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.aop 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2002-2007 the original author or authors.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *      http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:
17:        package org.springframework.aop;
18:
19:        import java.lang.reflect.Method;
20:
21:        /**
22:         * Part of a {@link Pointcut}: Checks whether the target method is eligible for advice.
23:         *
24:         * <p>A MethodMatcher may be evaluated <b>statically</b> or at <b>runtime</b> (dynamically).
25:         * Static matching involves method and (possibly) method attributes. Dynamic matching
26:         * also makes arguments for a particular call available, and any effects of running
27:         * previous advice applying to the joinpoint.
28:         *
29:         * <p>If an implementation returns <code>false</code> from its {@link #isRuntime()}
30:         * method, evaluation can be performed statically, and the result will be the same
31:         * for all invocations of this method, whatever their arguments. This means that
32:         * if the {@link #isRuntime()} method returns <code>false</code>, the 3-arg
33:         * {@link #matches(java.lang.reflect.Method, Class, Object[])} method will never be invoked.
34:         *
35:         * <p>If an implementation returns <code>true</code> from its 2-arg
36:         * {@link #matches(java.lang.reflect.Method, Class)} method and its {@link #isRuntime()} method
37:         * returns <code>true</code>, the 3-arg {@link #matches(java.lang.reflect.Method, Class, Object[])}
38:         * method will be invoked <i>immediately before each potential execution of the related advice</i>,
39:         * to decide whether the advice should run. All previous advice, such as earlier interceptors
40:         * in an interceptor chain, will have run, so any state changes they have produced in
41:         * parameters or ThreadLocal state will be available at the time of evaluation.
42:         *
43:         * @author Rod Johnson
44:         * @since 11.11.2003
45:         * @see Pointcut
46:         * @see ClassFilter
47:         */
48:        public interface MethodMatcher {
49:
50:            /**
51:             * Perform static checking whether the given method matches. If this
52:             * returns <code>false</code> or if the {@link #isRuntime()} method
53:             * returns <code>false</code>, no runtime check (i.e. no.
54:             * {@link #matches(java.lang.reflect.Method, Class, Object[])} call) will be made.
55:             * @param method the candidate method
56:             * @param targetClass the target class (may be <code>null</code>, in which case
57:             * the candidate class must be taken to be the method's declaring class)
58:             * @return whether or not this method matches statically
59:             */
60:            boolean matches(Method method, Class targetClass);
61:
62:            /**
63:             * Is this MethodMatcher dynamic, that is, must a final call be made on the
64:             * {@link #matches(java.lang.reflect.Method, Class, Object[])} method at
65:             * runtime even if the 2-arg matches method returns <code>true</code>?
66:             * <p>Can be invoked when an AOP proxy is created, and need not be invoked
67:             * again before each method invocation,
68:             * @return whether or not a runtime match via the 3-arg
69:             * {@link #matches(java.lang.reflect.Method, Class, Object[])} method
70:             * is required if static matching passed
71:             */
72:            boolean isRuntime();
73:
74:            /**
75:             * Check whether there a runtime (dynamic) match for this method,
76:             * which must have matched statically.
77:             * <p>This method is invoked only if the 2-arg matches method returns
78:             * <code>true</code> for the given method and target class, and if the
79:             * {@link #isRuntime()} method returns <code>true</code>. Invoked
80:             * immediately before potential running of the advice, after any
81:             * advice earlier in the advice chain has run.
82:             * @param method the candidate method
83:             * @param targetClass the target class (may be <code>null</code>, in which case
84:             * the candidate class must be taken to be the method's declaring class)
85:             * @param args arguments to the method
86:             * @return whether there's a runtime match
87:             * @see MethodMatcher#matches(Method, Class)
88:             */
89:            boolean matches(Method method, Class targetClass, Object[] args);
90:
91:            /**
92:             * Canonical instance that matches all methods.
93:             */
94:            MethodMatcher TRUE = TrueMethodMatcher.INSTANCE;
95:
96:        }
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