| 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; |
| } |
| } |