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Java example source code file (MethodAspect.java)

This example Java source code file (MethodAspect.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

class, list, matcher, methodaspect, methodinterceptor, reflection, util

The MethodAspect.java Java example source code

/**
 * Copyright (C) 2006 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.inject.internal;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.inject.matcher.Matcher;

import org.aopalliance.intercept.MethodInterceptor;

import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;

/**
 * Ties a matcher to a method interceptor.
 *
 * @author crazybob@google.com (Bob Lee)
 */
final class MethodAspect {

  private final Matcher<? super Class classMatcher;
  private final Matcher<? super Method> methodMatcher;
  private final List<MethodInterceptor> interceptors;

  /**
   * @param classMatcher matches classes the interceptor should apply to. For example: {@code
   *     only(Runnable.class)}.
   * @param methodMatcher matches methods the interceptor should apply to. For example: {@code
   *     annotatedWith(Transactional.class)}.
   * @param interceptors to apply
   */
  MethodAspect(Matcher<? super Class classMatcher,
      Matcher<? super Method> methodMatcher, List interceptors) {
    this.classMatcher = checkNotNull(classMatcher, "class matcher");
    this.methodMatcher = checkNotNull(methodMatcher, "method matcher");
    this.interceptors = checkNotNull(interceptors, "interceptors");
  }

  MethodAspect(Matcher<? super Class classMatcher,
      Matcher<? super Method> methodMatcher, MethodInterceptor... interceptors) {
    this(classMatcher, methodMatcher, Arrays.asList(interceptors));
  }

  boolean matches(Class<?> clazz) {
    return classMatcher.matches(clazz);
  }

  boolean matches(Method method) {
    return methodMatcher.matches(method);
  }

  List<MethodInterceptor> interceptors() {
    return interceptors;
  }
}

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