MixedDeletionPolicy.java
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上传日期:2018-01-08
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文件大小:2k
- /**
- * 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.hadoop.contrib.index.lucene;
- import java.io.IOException;
- import java.util.List;
- import org.apache.lucene.index.IndexCommitPoint;
- import org.apache.lucene.index.IndexDeletionPolicy;
- /**
- * For mixed directory. Use KeepAllDeletionPolicy for the read-only directory
- * (keep all from init) and use KeepOnlyLastCommitDeletionPolicy for the
- * writable directory (initially empty, keep latest after init).
- */
- class MixedDeletionPolicy implements IndexDeletionPolicy {
- private int keepAllFromInit = 0;
- public void onInit(List commits) throws IOException {
- keepAllFromInit = commits.size();
- }
- public void onCommit(List commits) throws IOException {
- int size = commits.size();
- assert (size > keepAllFromInit);
- // keep all from init and the latest, delete the rest
- for (int i = keepAllFromInit; i < size - 1; i++) {
- ((IndexCommitPoint) commits.get(i)).delete();
- }
- }
- }