Java Hash Calculate hash(int n)

Description

hash

License

Apache License

Declaration

public static int hash(int n) 

Method Source Code

//package com.java2s;
/*/*from  w  w w . jav  a2 s  . c o  m*/
 Copyright 1995-2013 Esri
    
   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.
    
 For additional information, contact:
 Environmental Systems Research Institute, Inc.
 Attn: Contracts Dept
 380 New York Street
 Redlands, California, USA 92373
    
 email: contracts@esri.com
 */

public class Main {
    public static int hash(int n) {
        int hash = 5381;
        hash = ((hash << 5) + hash) + (n & 0xFF); /* hash * 33 + c */
        hash = ((hash << 5) + hash) + ((n >> 8) & 0xFF);
        hash = ((hash << 5) + hash) + ((n >> 16) & 0xFF);
        hash = ((hash << 5) + hash) + ((n >> 24) & 0xFF);
        hash &= 0x7FFFFFFF;
        return hash;
    }

    public static int hash(double d) {
        long bits = Double.doubleToLongBits(d);
        int hc = (int) (bits ^ (bits >>> 32));
        return hash(hc);
    }

    public static int hash(int hashIn, int n) {
        int hash = ((hashIn << 5) + hashIn) + (n & 0xFF); /* hash * 33 + c */
        hash = ((hash << 5) + hash) + ((n >> 8) & 0xFF);
        hash = ((hash << 5) + hash) + ((n >> 16) & 0xFF);
        hash = ((hash << 5) + hash) + ((n >> 24) & 0xFF);
        hash &= 0x7FFFFFFF;
        return hash;
    }

    public static int hash(int hash, double d) {
        long bits = Double.doubleToLongBits(d);
        int hc = (int) (bits ^ (bits >>> 32));
        return hash(hash, hc);
    }
}

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7. hash(int seed, boolean value)
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