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/*
 * Copyright 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 java.util;

import static com.google.gwt.core.client.impl.Coercions.ensureInt;

import java.io.Serializable;

/**
 * Implementation of Map interface based on a hash table. [Sun
 * docs]
 * 
 * @param  key type
 * @param  value type
 */
public class HashMap extends AbstractHashMap implements Cloneable,
    Serializable {

  /**
   * Ensures that RPC will consider type parameter K to be exposed. It will be
   * pruned by dead code elimination.
   */
  @SuppressWarnings("unused")
  private K exposeKey;

  /**
   * Ensures that RPC will consider type parameter V to be exposed. It will be
   * pruned by dead code elimination.
   */
  @SuppressWarnings("unused")
  private V exposeValue;

  public HashMap() {
  }

  public HashMap(int ignored) {
    super(ignored);
  }

  public HashMap(int ignored, float alsoIgnored) {
    super(ignored, alsoIgnored);
  }

  public HashMap(Map toBeCopied) {
    super(toBeCopied);
  }

  public Object clone() {
    return new HashMap(this);
  }

  @Override
  boolean equals(Object value1, Object value2) {
    return Objects.equals(value1, value2);
  }

  @Override
  int getHashCode(Object key) {
    int hashCode = key.hashCode();
    // Coerce to int -- our classes all do this, but a user-written class might not.
    return ensureInt(hashCode);
  }
}