1 package org.apache.lucene.index;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
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20 import java.util.List;
23 * This {@link IndexDeletionPolicy} implementation that
24 * keeps only the most recent commit and immediately removes
25 * all prior commits after a new commit is done. This is
26 * the default deletion policy.
29 public final class KeepOnlyLastCommitDeletionPolicy implements IndexDeletionPolicy {
32 * Deletes all commits except the most recent one.
34 public void onInit(List<? extends IndexCommit> commits) {
35 // Note that commits.size() should normally be 1:
40 * Deletes all commits except the most recent one.
42 public void onCommit(List<? extends IndexCommit> commits) {
43 // Note that commits.size() should normally be 2 (if not
44 // called by onInit above):
45 int size = commits.size();
46 for(int i=0;i<size-1;i++) {
47 commits.get(i).delete();