Java Hash Calculate hash(Object value)

Description

hash

License

Open Source License

Declaration

public static String hash(Object value) 

Method Source Code

//package com.java2s;
/*//from   ww w . j a  v a 2s  . c om
 * Thrifty
 *
 * Copyright (c) Microsoft Corporation
 *
 * All rights reserved.
 *
 * 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
 *
 * THIS CODE IS PROVIDED ON AN  *AS IS* BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
 * WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF TITLE,
 * FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT.
 *
 * See the Apache Version 2.0 License for specific language governing permissions and limitations under the License.
 */

public class Main {
    private static final char[] HEX_CHARS = { '0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

    public static String hash(Object value) {
        if (value == null) {
            return "null";
        }

        int hashcode = value.hashCode();

        // Integer.toHexString(int) doesn't pad to 8 chars;
        // this is simple enough to do ourselves.
        char[] hexChars = new char[8];
        hexChars[0] = HEX_CHARS[(hashcode >> 28) & 0xF];
        hexChars[1] = HEX_CHARS[(hashcode >> 24) & 0xF];
        hexChars[2] = HEX_CHARS[(hashcode >> 20) & 0xF];
        hexChars[3] = HEX_CHARS[(hashcode >> 16) & 0xF];
        hexChars[4] = HEX_CHARS[(hashcode >> 12) & 0xF];
        hexChars[5] = HEX_CHARS[(hashcode >> 8) & 0xF];
        hexChars[6] = HEX_CHARS[(hashcode >> 4) & 0xF];
        hexChars[7] = HEX_CHARS[hashcode & 0xF];
        return new String(hexChars);
    }
}

Related

1. hash(Object obj)
2. hash(Object obj)
3. hash(Object obj)
4. hash(Object object)
5. hash(Object v)
6. hash(Object value, int seed)
7. hash(Object... as)
8. hash(Object... value)
9. hash(Object... values)