subprojects/s4-comm/src/main/java/org/apache/s4/comm/DefaultHasher.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.s4.comm;

import org.apache.s4.base.Hasher;

public class DefaultHasher implements Hasher {

    @Override
    public long hash(String hashKey) {
        int b = 378551;
        int a = 63689;
        long hash = 0;

        for (int i = 0; i < hashKey.length(); i++) {
            hash = hash * a + hashKey.charAt(i);
            a = a * b;
        }

        return Math.abs(hash);
    }

}