001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019 package org.apache.hadoop.fs; 020 021 import java.util.regex.PatternSyntaxException; 022 import java.io.IOException; 023 024 import org.apache.hadoop.classification.InterfaceAudience; 025 import org.apache.hadoop.classification.InterfaceStability; 026 027 /** 028 * A filter for POSIX glob pattern with brace expansions. 029 */ 030 @InterfaceAudience.Public 031 @InterfaceStability.Evolving 032 public class GlobFilter implements PathFilter { 033 private final static PathFilter DEFAULT_FILTER = new PathFilter() { 034 public boolean accept(Path file) { 035 return true; 036 } 037 }; 038 039 private PathFilter userFilter = DEFAULT_FILTER; 040 private GlobPattern pattern; 041 042 /** 043 * Creates a glob filter with the specified file pattern. 044 * 045 * @param filePattern the file pattern. 046 * @throws IOException thrown if the file pattern is incorrect. 047 */ 048 public GlobFilter(String filePattern) throws IOException { 049 init(filePattern, DEFAULT_FILTER); 050 } 051 052 /** 053 * Creates a glob filter with the specified file pattern and an user filter. 054 * 055 * @param filePattern the file pattern. 056 * @param filter user filter in addition to the glob pattern. 057 * @throws IOException thrown if the file pattern is incorrect. 058 */ 059 public GlobFilter(String filePattern, PathFilter filter) throws IOException { 060 init(filePattern, filter); 061 } 062 063 void init(String filePattern, PathFilter filter) throws IOException { 064 try { 065 userFilter = filter; 066 pattern = new GlobPattern(filePattern); 067 } 068 catch (PatternSyntaxException e) { 069 // Existing code expects IOException startWith("Illegal file pattern") 070 throw new IOException("Illegal file pattern: "+ e.getMessage(), e); 071 } 072 } 073 074 boolean hasPattern() { 075 return pattern.hasWildcard(); 076 } 077 078 public boolean accept(Path path) { 079 return pattern.matches(path.getName()) && userFilter.accept(path); 080 } 081 }