| 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 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(); |
| } |
| } |
| } |