org.apache.lucene.index.OneMergeWrappingMergePolicy 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 org.apache.lucene.index;
import java.io.IOException;
import java.util.Map;
import java.util.function.UnaryOperator;
/**
* A wrapping merge policy that wraps the {@link org.apache.lucene.index.MergePolicy.OneMerge}
* objects returned by the wrapped merge policy.
*
* @lucene.experimental
*/
public class OneMergeWrappingMergePolicy extends MergePolicyWrapper {
private final UnaryOperator wrapOneMerge;
/**
* Constructor
*
* @param in - the wrapped merge policy
* @param wrapOneMerge - operator for wrapping OneMerge objects
*/
public OneMergeWrappingMergePolicy(MergePolicy in, UnaryOperator wrapOneMerge) {
super(in);
this.wrapOneMerge = wrapOneMerge;
}
@Override
public MergeSpecification findMerges(MergeTrigger mergeTrigger, SegmentInfos segmentInfos, IndexWriter writer)
throws IOException {
return wrapSpec(in.findMerges(mergeTrigger, segmentInfos, writer));
}
@Override
public MergeSpecification findForcedMerges(SegmentInfos segmentInfos, int maxSegmentCount,
Map segmentsToMerge, IndexWriter writer) throws IOException {
return wrapSpec(in.findForcedMerges(segmentInfos, maxSegmentCount, segmentsToMerge, writer));
}
@Override
public MergeSpecification findForcedDeletesMerges(SegmentInfos segmentInfos, IndexWriter writer)
throws IOException {
return wrapSpec(in.findForcedDeletesMerges(segmentInfos, writer));
}
private MergeSpecification wrapSpec(MergeSpecification spec) {
MergeSpecification wrapped = spec == null ? null : new MergeSpecification();
if (wrapped != null) {
for (OneMerge merge : spec.merges) {
wrapped.add(wrapOneMerge.apply(merge));
}
}
return wrapped;
}
}