package com.atlassian.plugin.predicate;
   
   import java.util.Collection;
   import java.util.regex.Matcher;
   import java.util.regex.Pattern;
   
   import com.atlassian.annotations.ExperimentalApi;
   import com.atlassian.plugin.Plugin;
   import com.atlassian.plugin.util.RegularExpressions;
  
  /**
   * A plugin predicate which matches regular expressions against plugin keys.
   */
  @ExperimentalApi
  public class PluginKeyPatternsPredicate implements PluginPredicate
  {
      public enum MatchType
      {
          /**
           * Specifies a PluginPredicate which matches if any one of a given list of
           * included regular expressions is matched.
           */
          MATCHES_ANY
          {
              /**
               * Obtain a regular expression which matches any of the provided parts.
               */
              public String buildRegularExpression(final Collection<String> parts)
              {
                  return RegularExpressions.anyOf(parts);
              }
  
              /**
               * This MatchType matches if the Matcher does match, as we want to match if any of the
               * inclusions provided to {@link #buildRegularExpression} matches.
               */
              public boolean processMatcher(final Matcher matcher)
              {
                  return matcher.matches();
              }
          },
  
          /**
           * Specifies a PluginPredicate which matches if none of a given list of
           * excluded regular expressions is matched.
           */
          MATCHES_NONE
          {
              /**
               * Obtain a regular expression which matches any of the provided parts.
               */
              public String buildRegularExpression(final Collection<String> parts)
              {
                  return RegularExpressions.anyOf(parts);
              }
  
              /**
               * This MatchType matches if the Matcher does not match, as we want to match only when
               * none of the exclusions provided to {@link #buildRegularExpression} matches.
               */
              public boolean processMatcher(final Matcher matcher)
              {
                  return !matcher.matches();
              }
          };
  
          public abstract String buildRegularExpression(final Collection<String> parts);
  
          public abstract boolean processMatcher(final Matcher matcher);
      }
  
      private final MatchType matchType;
      private final Pattern pattern;
  
      public PluginKeyPatternsPredicate(final MatchType matchType, final Collection<String> parts)
      {
          this.matchType = matchType;
          this.pattern = Pattern.compile(matchType.buildRegularExpression(parts));
      }
  
      public boolean matches(final Plugin plugin)
      {
          return matchType.processMatcher(pattern.matcher(plugin.getKey()));
      }
  }