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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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* A {@link MergeScheduler} which never executes any merges. It is also a
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* singleton and can be accessed through {@link NoMergeScheduler#INSTANCE}. Use
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* it if you want to prevent an {@link IndexWriter} from ever executing merges,
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* irregardless of the {@link MergePolicy} used. Note that you can achieve the
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* same thing by using {@link NoMergePolicy}, however with
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* {@link NoMergeScheduler} you also ensure that no unnecessary code of any
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* {@link MergeScheduler} implementation is ever executed. Hence it is
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* recommended to use both if you want to disable merges from ever happening.
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public final class NoMergeScheduler extends MergeScheduler {
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/** The single instance of {@link NoMergeScheduler} */
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public static final MergeScheduler INSTANCE = new NoMergeScheduler();
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private NoMergeScheduler() {
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// prevent instantiation
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public void close() {}
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public void merge(IndexWriter writer) throws CorruptIndexException, IOException {}