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

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Here is the source code for org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy.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.util.List;

/**
 * This {@link IndexDeletionPolicy} implementation that
 * keeps only the most recent commit and immediately removes
 * all prior commits after a new commit is done.  This is
 * the default deletion policy.
 */

public final class KeepOnlyLastCommitDeletionPolicy extends IndexDeletionPolicy {

    /** Sole constructor. */
    public KeepOnlyLastCommitDeletionPolicy() {
    }

    /**
     * Deletes all commits except the most recent one.
     */
    @Override
    public void onInit(List<? extends IndexCommit> commits) {
        // Note that commits.size() should normally be 1:
        onCommit(commits);
    }

    /**
     * Deletes all commits except the most recent one.
     */
    @Override
    public void onCommit(List<? extends IndexCommit> commits) {
        // Note that commits.size() should normally be 2 (if not
        // called by onInit above):
        int size = commits.size();
        for (int i = 0; i < size - 1; i++) {
            commits.get(i).delete();
        }
    }
}