src/org/apache/pig/impl/bloom/JenkinsHash.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.pig.impl.bloom;

public class JenkinsHash extends Hash {

    private org.apache.hadoop.util.hash.Hash hashFunction = org.apache.hadoop.util.hash.JenkinsHash.getInstance();

    @Override
    public int[] hash(byte[] bytes, int maxValue, int nbHash) {
        int[] result = new int[nbHash];
        for (int i = 0, initval = 0; i < nbHash; i++) {
        initval = hashFunction.hash(bytes, initval);
        result[i] = Math.abs(initval % maxValue);
        }
        return result;
    }

}