Maps.java

/*
 * Copyright (C) 2007 The Guava Authors
 *
 * 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.facebook.common.internal;

import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Map;

/**
 * Static utility methods pertaining to {@link Map} instances.
 *
 * @author Kevin Bourrillion
 * @author Mike Bostock
 * @author Isaac Shum
 * @author Louis Wasserman
 * @since 2.0 (imported from Google Collections Library)
 */
public final class Maps {
  private Maps() {}

  /**
   * Creates a <i>mutable</i>, empty {@code HashMap} instance.
   *
   * @return a new, empty {@code HashMap}
   */
  public static <K, V> HashMap<K, V> newHashMap() {
    return new HashMap<K, V>();
  }

  /**
   * Creates an {@code IdentityHashMap} instance.
   *
   * @return a new, empty {@code IdentityHashMap}
   */
  public static <K, V> IdentityHashMap<K, V> newIdentityHashMap() {
    return new IdentityHashMap<K, V>();
  }
}