com.alipay.sofa.jraft.test.atomic.HashUtils Maven / Gradle / Ivy
/*
* 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 com.alipay.sofa.jraft.test.atomic;
import java.util.SortedMap;
import java.util.TreeMap;
public class HashUtils {
public static long getHeadKey(TreeMap map, String key) {
long hash = Math.abs(HashAlgorithm.FNV1_64_HASH.hash(key));
SortedMap headMap = map.headMap(hash, true);
return headMap != null && !headMap.isEmpty() ? headMap.lastKey() : map.firstKey();
}
}