com.guardtime.ksi.unisignature.AggregationHashChainUtil Maven / Gradle / Ivy
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/*
* Copyright 2013-2018 Guardtime, Inc.
*
* This file is part of the Guardtime client SDK.
*
* Licensed 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, CONDITIONS, OR OTHER LICENSES OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
* "Guardtime" and "KSI" are trademarks or registered trademarks of
* Guardtime, Inc., and no license to trademarks is granted; Guardtime
* reserves and retains all trademark rights.
*
*/
package com.guardtime.ksi.unisignature;
import java.util.List;
import static com.guardtime.ksi.util.Util.notNull;
public final class AggregationHashChainUtil {
/**
* Calculates chain index
*
* @param links Chain links for which to calculate the index
* @return Index of the chain
*/
public static long calculateIndex(List links) {
notNull(links, "Aggregation chain links");
long chainIndex = 0;
for (int i = 0; i < links.size(); i++) {
if (links.get(i).isLeft()) {
chainIndex |= 1L << i;
}
}
chainIndex |= 1L << links.size();
return chainIndex;
}
private AggregationHashChainUtil() {
}
}