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Java example source code file (BindingImpl.java)

This example Java source code file (BindingImpl.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

assertionerror, bindingimpl, injectorimpl, instancebinding, internalfactory, key, object, override, provider, scoping, string, unsupportedoperationexception

The BindingImpl.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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package com.google.inject.internal;

import com.google.common.base.MoreObjects;
import com.google.inject.Binding;
import com.google.inject.Key;
import com.google.inject.Provider;
import com.google.inject.spi.BindingScopingVisitor;
import com.google.inject.spi.ElementVisitor;
import com.google.inject.spi.InstanceBinding;

 * @author crazybob@google.com (Bob Lee)
public abstract class BindingImpl<T> implements Binding {

  private final InjectorImpl injector;
  private final Key<T> key;
  private final Object source;
  private final Scoping scoping;
  private final InternalFactory<? extends T> internalFactory;

  public BindingImpl(InjectorImpl injector, Key<T> key, Object source,
      InternalFactory<? extends T> internalFactory, Scoping scoping) {
    this.injector = injector;
    this.key = key;
    this.source = source;
    this.internalFactory = internalFactory;
    this.scoping = scoping;

  protected BindingImpl(Object source, Key<T> key, Scoping scoping) {
    this.internalFactory = null;
    this.injector = null;
    this.source = source;
    this.key = key;
    this.scoping = scoping;

  public Key<T> getKey() {
    return key;

  public Object getSource() {
    return source;

  private volatile Provider<T> provider;

  public Provider<T> getProvider() {
    if (provider == null) {
      if (injector == null) {
        throw new UnsupportedOperationException("getProvider() not supported for module bindings");

      provider = injector.getProvider(key);
    return provider;

  public InternalFactory<? extends T> getInternalFactory() {
    return internalFactory;

  public Scoping getScoping() {
    return scoping;

   * Is this a constant binding? This returns true for constant bindings as
   * well as toInstance() bindings.
  public boolean isConstant() {
    return this instanceof InstanceBinding;

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

  public <V> V acceptScopingVisitor(BindingScopingVisitor visitor) {
    return scoping.acceptVisitor(visitor);

  protected BindingImpl<T> withScoping(Scoping scoping) {
    throw new AssertionError();

  protected BindingImpl<T> withKey(Key key) {
    throw new AssertionError();
  @Override public String toString() {
    return MoreObjects.toStringHelper(Binding.class)
        .add("key", key)
        .add("scope", scoping)
        .add("source", source)

  public InjectorImpl getInjector() {
    return injector;

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