/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.elasticsearch.cluster.routing.operation.hash.djb;
import org.elasticsearch.cluster.routing.operation.hash.HashFunction;
/**
*
*/
public class DjbHashFunction implements HashFunction {
public static int DJB_HASH(String value) {
long hash = 5381;
for (int i = 0; i < value.length(); i++) {
hash = ((hash << 5) + hash) + value.charAt(i);
}
return (int) hash;
}
@Override
public int hash(String routing) {
return DJB_HASH(routing);
}
@Override
public int hash(String type, String id) {
long hash = 5381;
for (int i = 0; i < type.length(); i++) {
hash = ((hash << 5) + hash) + type.charAt(i);
}
for (int i = 0; i < id.length(); i++) {
hash = ((hash << 5) + hash) + id.charAt(i);
}
return (int) hash;
}
}