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