/**
* 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();
}
}
}