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Java example source code file (ProvisionListenerBinding.java)

This example Java source code file (ProvisionListenerBinding.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

binding, element, matcher, object, provisionlistenerbinding, util

The ProvisionListenerBinding.java Java example source code

/**
 * Copyright (C) 2011 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 com.google.common.collect.ImmutableList;
import com.google.inject.Binder;
import com.google.inject.Binding;
import com.google.inject.matcher.Matcher;

import java.util.List;

/**
 * Binds keys (picked using a Matcher) to a provision listener. Listeners are created explicitly in
 * a module using {@link Binder#bindListener(Matcher, ProvisionListener...)} statements:
 *
 * @author sameb@google.com (Sam Berlin)
 * @since 4.0
 */
public final class ProvisionListenerBinding implements Element {

  private final Object source;
  private final Matcher<? super Binding bindingMatcher;
  private final List<ProvisionListener> listeners;

  ProvisionListenerBinding(Object source,
      Matcher<? super Binding bindingMatcher,
      ProvisionListener[] listeners) {
    this.source = source;
    this.bindingMatcher = bindingMatcher;
    this.listeners = ImmutableList.copyOf(listeners);
  }

  /** Returns the registered listeners. */
  public List<ProvisionListener> getListeners() {
    return listeners;
  }

  /**
   * Returns the binding matcher which chooses which bindings the listener should be notified of.
   */  
  public Matcher<? super Binding getBindingMatcher() {
    return bindingMatcher;
  }

  public Object getSource() {
    return source;
  }

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

  public void applyTo(Binder binder) {
    binder.withSource(getSource()).bindListener(bindingMatcher,
        listeners.toArray(new ProvisionListener[listeners.size()]));
  }
}

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