com.google.gwt.emul.java.util.HashMap Maven / Gradle / Ivy
/*
* 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 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);
}
@Override
public Object clone() {
return new HashMap(this);
}
@Override
protected boolean equals(Object value1, Object value2) {
return Utility.equalsWithNullCheck(value1, value2);
}
@Override
protected int getHashCode(Object key) {
// Coerce to int -- our classes all do this, but a user-written class might not.
return ~~key.hashCode();
}
}