1bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2006 The Guava Authors 3bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 4bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Licensed under the Apache License, Version 2.0 (the "License"); 5bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * you may not use this file except in compliance with the License. 6bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * You may obtain a copy of the License at 7bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 8bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * http://www.apache.org/licenses/LICENSE-2.0 9bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 10bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Unless required by applicable law or agreed to in writing, software 11bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * distributed under the License is distributed on an "AS IS" BASIS, 12bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * See the License for the specific language governing permissions and 14bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * limitations under the License. 15bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 16bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 17bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorpackage com.google.common.io; 18bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.Beta; 20bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport com.google.common.base.Preconditions; 21bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 22bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.io.File; 23bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.io.FilenameFilter; 24bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.regex.Pattern; 25bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.regex.PatternSyntaxException; 26bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport javax.annotation.Nullable; 281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 29bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor/** 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * File name filter that only accepts files matching a regular expression. This class is thread-safe 311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * and immutable. 32bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 33bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @author Apple Chow 341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 1.0 35bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@Beta 37bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorpublic final class PatternFilenameFilter implements FilenameFilter { 38bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 39bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private final Pattern pattern; 40bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 41bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 42bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Constructs a pattern file name filter object. 43bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param patternStr the pattern string on which to filter file names 44bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 45bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws PatternSyntaxException if pattern compilation fails (runtime) 46bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 47bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public PatternFilenameFilter(String patternStr) { 48bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this(Pattern.compile(patternStr)); 49bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 50bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 51bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 52bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Constructs a pattern file name filter object. 53bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param pattern the pattern on which to filter file names 54bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 55bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public PatternFilenameFilter(Pattern pattern) { 56bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.pattern = Preconditions.checkNotNull(pattern); 57bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 58bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override public boolean accept(@Nullable File dir, String fileName) { 60bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return pattern.matcher(fileName).matches(); 61bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 62bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor} 63