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Java example source code file (MapBinderBinding.java)

This example Java source code file (MapBinderBinding.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, key, mapbinderbinding, typeliteral, util

The MapBinderBinding.java Java example source code

/**
 * Copyright (C) 2010 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.multibindings;

import com.google.inject.Binding;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import com.google.inject.spi.Element;
import com.google.inject.spi.Elements;

import java.util.List;
import java.util.Map;

/**
 * A binding for a MapBinder.
 * <p>
 * Although MapBinders may be injected through a variety of generic types (Map<K, V>, Map
 * <K, Provider<V>>, Map<K, Set<V>>, Map<K, Set<
 * Provider<V>>, and even Set<Map.Entry<K, Provider<V>>), a
 * MapBinderBinding exists only on the Binding associated with the Map<K, V> key. Other
 * bindings can be validated to be derived from this MapBinderBinding using
 * {@link #containsElement(Element)}.
 * 
 * @param <T> The fully qualified type of the map, including Map. For example:
 *          <code>MapBinderBinding<Map<String, Snack>>
 * 
 * @since 3.0
 * @author sameb@google.com (Sam Berlin)
 */
public interface MapBinderBinding<T> {

  /** Returns the {@link Key} for the map. */
  Key<T> getMapKey();

  /**
   * Returns the TypeLiteral describing the keys of the map.
   * <p>
   * The TypeLiteral will always match the type Map's generic type. For example, if getMapKey
   * returns a key of <code>Map<String, Snack>, then this will always return a
   * <code>TypeLiteral<String>.
   */
  TypeLiteral<?> getKeyTypeLiteral();

  /**
   * Returns the TypeLiteral describing the values of the map.
   * <p>
   * The TypeLiteral will always match the type Map's generic type. For example, if getMapKey
   * returns a key of <code>Map<String, Snack>, then this will always return a
   * <code>TypeLiteral<Snack>.
   */
  TypeLiteral<?> getValueTypeLiteral();

  /**
   * Returns all entries in the Map. The returned list of Map.Entries contains the key and a binding
   * to the value. Duplicate keys or values will exist as separate Map.Entries in the returned list.
   * This is only supported on bindings returned from an injector. This will throw
   * {@link UnsupportedOperationException} if it is called on an element retrieved from
   * {@link Elements#getElements}.
   * <p>
   * The elements will always match the type Map's generic type. For example, if getMapKey returns a
   * key of <code>Map<String, Snack>, then this will always return a list of type
   * <code>List<Map.Entry<String, Binding<Snack>>>.
   */
  List<Map.Entry> getEntries();

  /**
   * Returns true if the MapBinder permits duplicates. This is only supported on bindings returned
   * from an injector. This will throw {@link UnsupportedOperationException} if it is called on a
   * MapBinderBinding retrieved from {@link Elements#getElements}.
   */
  boolean permitsDuplicates();

  /**
   * Returns true if this MapBinder contains the given Element in order to build the map or uses the
   * given Element in order to support building and injecting the map. This will work for
   * MapBinderBindings retrieved from an injector and {@link Elements#getElements}. Usually this is
   * only necessary if you are working with elements retrieved from modules (without an Injector),
   * otherwise {@link #getEntries} and {@link #permitsDuplicates} are better options.
   * <p>
   * If you need to introspect the details of the map, such as the keys, values or if it permits
   * duplicates, it is necessary to pass the elements through an Injector and use
   * {@link #getEntries()} and {@link #permitsDuplicates()}.
   */
  boolean containsElement(Element element);
}

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