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Java example source code file (InterceptorBinding.java)

This example Java source code file (InterceptorBinding.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, element, immutablelist, interceptorbinding, list, matcher, method, methodinterceptor, object, reflection, util

The InterceptorBinding.java Java example source code

/**
 * Copyright (C) 2008 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.spi;

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

import com.google.common.collect.ImmutableList;
import com.google.inject.Binder;
import com.google.inject.matcher.Matcher;

import org.aopalliance.intercept.MethodInterceptor;

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

/**
 * Registration of interceptors for matching methods of matching classes. Instances are created
 * explicitly in a module using {@link com.google.inject.Binder#bindInterceptor(
 * Matcher, Matcher, MethodInterceptor[]) bindInterceptor()} statements:
 * <pre>
 *     bindInterceptor(Matchers.subclassesOf(MyAction.class),
 *         Matchers.annotatedWith(Transactional.class),
 *         new MyTransactionInterceptor());</pre>
 *
 * or from an injectable type listener using {@link TypeEncounter#bindInterceptor(Matcher,
 * org.aopalliance.intercept.MethodInterceptor[]) TypeEncounter.bindInterceptor()}.
 *
 * @author jessewilson@google.com (Jesse Wilson)
 * @since 2.0
 */
public final class InterceptorBinding implements Element {
  private final Object source;
  private final Matcher<? super Class classMatcher;
  private final Matcher<? super Method> methodMatcher;
  private final ImmutableList<MethodInterceptor> interceptors;

  InterceptorBinding(
      Object source,
      Matcher<? super Class classMatcher,
      Matcher<? super Method> methodMatcher,
      MethodInterceptor[] interceptors) {
    this.source = checkNotNull(source, "source");
    this.classMatcher = checkNotNull(classMatcher, "classMatcher");
    this.methodMatcher = checkNotNull(methodMatcher, "methodMatcher");
    this.interceptors = ImmutableList.copyOf(interceptors);
  }

  public Object getSource() {
    return source;
  }

  public Matcher<? super Class getClassMatcher() {
    return classMatcher;
  }

  public Matcher<? super Method> getMethodMatcher() {
    return methodMatcher;
  }

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

  public <T> T acceptVisitor(ElementVisitor visitor) {
    return visitor.visit(this);
  }

  public void applyTo(Binder binder) {
    binder.withSource(getSource()).bindInterceptor(classMatcher, methodMatcher,
        interceptors.toArray(new MethodInterceptor[interceptors.size()]));
  }
}

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