package org.slf4j.migrator;import org.slf4j.migrator.line.EmptyRuleSet;import org.slf4j.migrator.line.JCLRuleSet;import org.slf4j.migrator.line.JULRuleSet;import org.slf4j.migrator.line.Log4jRuleSet;import org.slf4j.migrator.line.RuleSet;/** * This class runs Pattern matching with java.util.regex using Patterns defined * in concrete implementations *  * @author jean-noelcharpin *  */public abstract class RuleSetFactory {   /**   * Return matcher implementation depending on the conversion mode   *    * @param conversionType   * @return AbstractMatcher implementation   */  public static RuleSet getMatcherImpl(int conversionType) {    switch (conversionType) {    case Constant.JCL_TO_SLF4J:      return new JCLRuleSet();    case Constant.LOG4J_TO_SLF4J:      return new Log4jRuleSet();    case Constant.JUL_TO_SLF4J:        return new JULRuleSet();    case Constant.NOP_TO_SLF4J:      return new EmptyRuleSet();    default:      return null;    }  }}