org.bboxdb.storage.sstable.duplicateresolver.VersionTupleDuplicateResolver Maven / Gradle / Ivy
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*
* Copyright (C) 2015-2018 the BBoxDB project
*
* 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 OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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package org.bboxdb.storage.sstable.duplicateresolver;
import java.util.Iterator;
import java.util.List;
import org.bboxdb.commons.DuplicateResolver;
import org.bboxdb.storage.entity.Tuple;
public class VersionTupleDuplicateResolver implements DuplicateResolver {
/**
* The versions
*/
protected final int versions;
public VersionTupleDuplicateResolver(final int versions) {
this.versions = versions;
}
@Override
public void removeDuplicates(final List unconsumedDuplicates) {
unconsumedDuplicates.sort((t1, t2) -> (Long.compare(t1.getVersionTimestamp(), t2.getVersionTimestamp())));
final int elementsToRemove = Math.max(0, unconsumedDuplicates.size() - versions);
int removed = 0;
for(Iterator iter = unconsumedDuplicates.iterator(); iter.hasNext(); ) {
iter.next();
if(removed < elementsToRemove) {
iter.remove();
removed++;
}
}
}
}