org.apache.lucene.index.NoMergePolicy.java Source code

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Here is the source code for org.apache.lucene.index.NoMergePolicy.java

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/*
 * 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 org.apache.lucene.util.IOSupplier;

/**
 * A {@link MergePolicy} which never returns merges to execute. Use it if you
 * want to prevent segment merges.
 */
public final class NoMergePolicy extends MergePolicy {

    /** Singleton instance. */
    public static final MergePolicy INSTANCE = new NoMergePolicy();

    private NoMergePolicy() {
        super();
    }

    @Override
    public MergeSpecification findMerges(MergeTrigger mergeTrigger, SegmentInfos segmentInfos,
            MergeContext mergeContext) {
        return null;
    }

    @Override
    public MergeSpecification findForcedMerges(SegmentInfos segmentInfos, int maxSegmentCount,
            Map<SegmentCommitInfo, Boolean> segmentsToMerge, MergeContext mergeContext) {
        return null;
    }

    @Override
    public MergeSpecification findForcedDeletesMerges(SegmentInfos segmentInfos, MergeContext mergeContext) {
        return null;
    }

    @Override
    public boolean useCompoundFile(SegmentInfos segments, SegmentCommitInfo newSegment, MergeContext mergeContext) {
        return newSegment.info.getUseCompoundFile();
    }

    @Override
    protected long size(SegmentCommitInfo info, MergeContext context) throws IOException {
        return Long.MAX_VALUE;
    }

    @Override
    public double getNoCFSRatio() {
        return super.getNoCFSRatio();
    }

    @Override
    public double getMaxCFSSegmentSizeMB() {
        return super.getMaxCFSSegmentSizeMB();
    }

    @Override
    public void setMaxCFSSegmentSizeMB(double v) {
        super.setMaxCFSSegmentSizeMB(v);
    }

    @Override
    public void setNoCFSRatio(double noCFSRatio) {
        super.setNoCFSRatio(noCFSRatio);
    }

    @Override
    public boolean keepFullyDeletedSegment(IOSupplier<CodecReader> readerIOSupplier) throws IOException {
        return super.keepFullyDeletedSegment(readerIOSupplier);
    }

    @Override
    public int numDeletesToMerge(SegmentCommitInfo info, int delCount, IOSupplier<CodecReader> readerSupplier)
            throws IOException {
        return super.numDeletesToMerge(info, delCount, readerSupplier);
    }

    @Override
    public String toString() {
        return "NoMergePolicy";
    }
}