Java Hash String hashString(CharSequence str)

Description

hash String

License

Open Source License

Declaration

public static final long hashString(CharSequence str) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static final long hashString(CharSequence str) {
        long hash = 0;

        if (str == null)
            return hash;

        //Prehash
        for (int i = 0, l = str.length(); i < l; i++) {
            hash += str.charAt(i);//from w w  w  .  ja  v  a  2s .c om
            hash += (hash << 10);
            hash ^= (hash >> 6);
        }

        //Posthash
        //step 1
        hash += (hash << 3);
        hash ^= (hash >> 11);
        hash += (hash << 15);
        //step 2
        hash = rehash(hash);

        return hash;

    }

    /**
     * @param hash
     * @return
     */
    public static long rehash(long hash) {
        hash ^= (hash >>> 20) ^ (hash >>> 12);
        hash = hash ^ (hash >>> 7) ^ (hash >>> 4);
        hash += ~(hash << 15);
        hash ^= (hash >>> 10);
        hash += (hash << 3);
        hash ^= (hash >>> 6);
        hash += ~(hash << 11);
        hash ^= (hash >>> 16);
        return hash;
    }
}

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4. hashPassword(String password)
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6. hashString(String data, int seed)
7. hashString(String s)
8. hashString(String s)
9. hashString(String s)