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;
import org.apache.lucene.index.codecs.CodecProvider;
/**
* Filename filter that accept filenames and extensions only
* created by Lucene.
*
* @lucene.internal
*/
public class IndexFileNameFilter implements FilenameFilter {
private final HashSet<String> extensions;
public IndexFileNameFilter(CodecProvider codecs) {
extensions = new HashSet<String>();
for (String ext : IndexFileNames.INDEX_EXTENSIONS) {
extensions.add(ext);
}
if (codecs != null) {
for(String ext : codecs.getAllExtensions()) {
extensions.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.startsWith(IndexFileNames.SEGMENTS)) return true;
}
return false;
}
}