/** | |
* 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(); | |
} | |
} | |
} |