Java Integer Hash intHash(long a)

Description

If the specified value is in int range, the returned value is identical.

License

Apache License

Return

An int hash of the specified value.

Declaration

static int intHash(long a) 

Method Source Code

//package com.java2s;
/*/*  ww w . j av  a  2 s  . co m*/
 * Copyright 2014 Jeff Hain
 *
 * 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.
 */

public class Main {
    /**
     * If the specified value is in int range, the returned value is identical.
     * 
     * @return An int hash of the specified value.
     */
    static int intHash(long a) {
        if (false) {
            // also works
            int hash = ((int) (a >> 32)) ^ ((int) a);
            if (a < 0) {
                hash = -hash - 1;
            }
            return hash;
        }
        int hash = ((int) (a >> 32)) + ((int) a);
        if (a < 0) {
            hash++;
        }
        return hash;
    }
}

Related

1. intHash(final long a)
2. intHash(int i)
3. intHash(int input)
4. intHash(int key)
5. intHash(int number, int max)
6. intHashCode(final int value)
7. intHashCode(int i)
8. intHashToLong(int hash)