001 /* 002 * Sonar, open source software quality management tool. 003 * Copyright (C) 2008-2011 SonarSource 004 * mailto:contact AT sonarsource DOT com 005 * 006 * Sonar is free software; you can redistribute it and/or 007 * modify it under the terms of the GNU Lesser General Public 008 * License as published by the Free Software Foundation; either 009 * version 3 of the License, or (at your option) any later version. 010 * 011 * Sonar is distributed in the hope that it will be useful, 012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 * Lesser General Public License for more details. 015 * 016 * You should have received a copy of the GNU Lesser General Public 017 * License along with Sonar; if not, write to the Free Software 018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02 019 */ 020 021 package net.sourceforge.pmd.util.filter; 022 023 import java.util.regex.Pattern; 024 025 /** 026 * A filter to which uses a regular expression to match upon Strings. 027 */ 028 public class RegexStringFilter implements Filter<String> { 029 030 protected String regex; 031 032 protected Pattern pattern; 033 034 public RegexStringFilter() { 035 } 036 037 public RegexStringFilter(String regex) { 038 this.regex = regex; 039 } 040 041 public String getRegex() { 042 return regex; 043 } 044 045 public void setRegex(String regex) { 046 this.regex = regex; 047 this.pattern = null; 048 } 049 050 public boolean filter(String obj) { 051 if (pattern == null) { 052 pattern = Pattern.compile(regex); 053 } 054 return pattern.matcher(obj).matches(); 055 } 056 057 public String toString() { 058 return "matches " + regex; 059 } 060 }