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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.FilenameFilter;
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import java.util.HashSet;
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* Filename filter that accept filenames and extensions only created by Lucene.
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public class IndexFileNameFilter implements FilenameFilter {
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private static IndexFileNameFilter singleton = new IndexFileNameFilter();
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private HashSet<String> extensions;
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private HashSet<String> extensionsInCFS;
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// Prevent instantiation.
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private IndexFileNameFilter() {
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extensions = new HashSet<String>();
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for (String ext : IndexFileNames.INDEX_EXTENSIONS) {
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extensionsInCFS = new HashSet<String>();
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for (String ext : IndexFileNames.INDEX_EXTENSIONS_IN_COMPOUND_FILE) {
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extensionsInCFS.add(ext);
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* @see java.io.FilenameFilter#accept(java.io.File, java.lang.String)
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public boolean accept(File dir, String name) {
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int i = name.lastIndexOf('.');
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String extension = name.substring(1+i);
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if (extensions.contains(extension)) {
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} else if (extension.startsWith("f") &&
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extension.matches("f\\d+")) {
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} else if (extension.startsWith("s") &&
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extension.matches("s\\d+")) {
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if (name.equals(IndexFileNames.DELETABLE)) return true;
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else if (name.startsWith(IndexFileNames.SEGMENTS)) return true;
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* Returns true if this is a file that would be contained
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* in a CFS file. This function should only be called on
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* files that pass the above "accept" (ie, are already
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* known to be a Lucene index file).
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public boolean isCFSFile(String name) {
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int i = name.lastIndexOf('.');
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String extension = name.substring(1+i);
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if (extensionsInCFS.contains(extension)) {
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if (extension.startsWith("f") &&
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extension.matches("f\\d+")) {
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public static IndexFileNameFilter getFilter() {