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Java example source code file (Binding.java)

This example Java source code file (Binding.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, key, provider

The Binding.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;

import com.google.inject.spi.BindingScopingVisitor;
import com.google.inject.spi.BindingTargetVisitor;
import com.google.inject.spi.Element;

/**
 * A mapping from a key (type and optional annotation) to the strategy for getting instances of the
 * type. This interface is part of the introspection API and is intended primarily for use by 
 * tools.
 *
 * <p>Bindings are created in several ways:
 * <ul>
 *     <li>Explicitly in a module, via {@code bind()} and {@code bindConstant()}
 *         statements:
 * <pre>
 *     bind(Service.class).annotatedWith(Red.class).to(ServiceImpl.class);
 *     bindConstant().annotatedWith(ServerHost.class).to(args[0]);</pre>
 *     <li>Implicitly by the Injector by following a type's {@link ImplementedBy
 *         pointer} {@link ProvidedBy annotations} or by using its {@link Inject annotated} or
 *         default constructor.</li>
 *     <li>By converting a bound instance to a different type.
 *     <li>For {@link Provider providers}, by delegating to the binding for the provided type.
 * </ul>
 *
 *
 * <p>They exist on both modules and on injectors, and their behaviour is different for each:
 * <ul>
 *     <li>Module bindings are incomplete and cannot be used to provide instances.
 *         This is because the applicable scopes and interceptors may not be known until an injector
 *         is created. From a tool's perspective, module bindings are like the injector's source
 *         code. They can be inspected or rewritten, but this analysis must be done statically.</li>
 *     <li>Injector bindings are complete and valid and can be used to provide
 *         instances. From a tools' perspective, injector bindings are like reflection for an
 *         injector. They have full runtime information, including the complete graph of injections
 *         necessary to satisfy a binding.</li>
 * </ul>
 *
 * @param <T> the bound type. The injected is always assignable to this type.
 *
 * @author crazybob@google.com (Bob Lee)
 * @author jessewilson@google.com (Jesse Wilson)
 */
public interface Binding<T> extends Element {

  /**
   * Returns the key for this binding.
   */
  Key<T> getKey();

  /**
   * Returns the scoped provider guice uses to fulfill requests for this
   * binding.
   *
   * @throws UnsupportedOperationException when invoked on a {@link Binding}
   *      created via {@link com.google.inject.spi.Elements#getElements}. This
   *      method is only supported on {@link Binding}s returned from an injector.
   */
  Provider<T> getProvider();

  /**
   * Accepts a target visitor. Invokes the visitor method specific to this binding's target.
   *
   * @param visitor to call back on
   * @since 2.0
   */
  <V> V acceptTargetVisitor(BindingTargetVisitor visitor);

  /**
   * Accepts a scoping visitor. Invokes the visitor method specific to this binding's scoping.
   *
   * @param visitor to call back on
   * @since 2.0
   */
  <V> V acceptScopingVisitor(BindingScopingVisitor visitor);
}

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