package org.apache.lucene.index;
/**
* 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.
*/
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 implements IndexDeletionPolicy {
/**
* Deletes all commits except the most recent one.
*/
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.
*/
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();
}
}
}