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package org.apache.lucene.index;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.IOException;
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import java.util.List;
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* An {@link IndexDeletionPolicy} which keeps all index commits around, never
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* deleting them. This class is a singleton and can be accessed by referencing
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public final class NoDeletionPolicy implements IndexDeletionPolicy {
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/** The single instance of this class. */
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public static final IndexDeletionPolicy INSTANCE = new NoDeletionPolicy();
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private NoDeletionPolicy() {
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// keep private to avoid instantiation
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public void onCommit(List<? extends IndexCommit> commits) throws IOException {}
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public void onInit(List<? extends IndexCommit> commits) throws IOException {}