001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2009 SonarSource SA
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    package org.sonar.squid.recognizer;
021    
022    public abstract class Detector {
023    
024      public final double probability;
025    
026      public Detector(double probability) {
027        if (probability < 0 || probability > 1) {
028          throw new IllegalArgumentException("probability should be between [0 .. 1]");
029        }
030        this.probability = probability;
031      }
032    
033      public abstract int scan(String line);
034    
035      public final double recognition(String line) {
036        int matchers = scan(line);
037        if (matchers == 0) {
038          return 0;
039        }
040        return 1 - Math.pow(1 - probability, scan(line));
041      }
042    }