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Java example source code file (BindingTargetVisitor.java)

This example Java source code file (BindingTargetVisitor.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.

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Java - Java tags/keywords

bindingtargetvisitor

The BindingTargetVisitor.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;

/**
 * Visits each of the strategies used to find an instance to satisfy an injection.
 *
 * @param <V> any type to be returned by the visit method. Use {@link Void} with
 *     {@code return null} if no return type is needed.
 * @since 2.0
 */
public interface BindingTargetVisitor<T, V> {

  /**
   * Visit a instance binding. The same instance is returned for every injection. This target is
   * found in both module and injector bindings.
   */
  V visit(InstanceBinding<? extends T> binding);

  /**
   * Visit a provider instance binding. The provider's {@code get} method is invoked to resolve
   * injections. This target is found in both module and injector bindings.
   */
  V visit(ProviderInstanceBinding<? extends T> binding);

  /**
   * Visit a provider key binding. To resolve injections, the provider key is first resolved, then
   * that provider's {@code get} method is invoked. This target is found in both module and injector
   * bindings.
   */
  V visit(ProviderKeyBinding<? extends T> binding);

  /**
   * Visit a linked key binding. The other key's binding is used to resolve injections. This
   * target is found in both module and injector bindings.
   */
  V visit(LinkedKeyBinding<? extends T> binding);

  /**
   * Visit a binding to a key exposed from an enclosed private environment. This target is only
   * found in injector bindings.
   */
  V visit(ExposedBinding<? extends T> binding);

  /**
   * Visit an untargetted binding. This target is found only on module bindings. It indicates
   * that the injector should use its implicit binding strategies to resolve injections.
   */
  V visit(UntargettedBinding<? extends T> binding);

  /**
   * Visit a constructor binding. To resolve injections, an instance is instantiated by invoking
   * {@code constructor}. This target is found only on injector bindings.
   */
  V visit(ConstructorBinding<? extends T> binding);

  /**
   * Visit a binding created from converting a bound instance to a new type. The source binding
   * has the same binding annotation but a different type. This target is found only on injector
   * bindings.
   */
  V visit(ConvertedConstantBinding<? extends T> binding);

  /**
   * Visit a binding to a {@link com.google.inject.Provider} that delegates to the binding for the
   * provided type. This target is found only on injector bindings.
   */
  V visit(ProviderBinding<? extends T> binding);
}

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