001/*
002 * Sonar, open source software quality management tool.
003 * Copyright (C) 2008-2012 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
021package org.sonar.squid.recognizer;
022
023public abstract class Detector {
024
025  public final double probability;
026
027  public Detector(double probability) {
028    if (probability < 0 || probability > 1) {
029      throw new IllegalArgumentException("probability should be between [0 .. 1]");
030    }
031    this.probability = probability;
032  }
033
034  public abstract int scan(String line);
035
036  public final double recognition(String line) {
037    int matchers = scan(line);
038    if (matchers == 0) {
039      return 0;
040    }
041    return 1 - Math.pow(1 - probability, scan(line));
042  }
043}