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PMD is a tool that looks for potential problems like possible bugs, dead code, suboptimal code, overcomplicated expressions or duplicate code.

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/*
 * Sonar, open source software quality management tool.
 * Copyright (C) 2008-2012 SonarSource
 * mailto:contact AT sonarsource DOT com
 *
 * Sonar is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * Sonar is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Sonar; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.plugins.pmd;

import com.google.common.collect.Lists;
import org.sonar.api.platform.ServerFileSystem;
import org.sonar.api.resources.Java;
import org.sonar.api.rules.Rule;
import org.sonar.api.rules.RuleRepository;
import org.sonar.api.rules.XMLRuleParser;

import java.io.File;
import java.util.List;

public final class PmdRuleRepository extends RuleRepository {

  // for user extensions
  private ServerFileSystem fileSystem;
  private XMLRuleParser xmlRuleParser;

  public PmdRuleRepository(ServerFileSystem fileSystem, XMLRuleParser xmlRuleParser) {
    super(PmdConstants.REPOSITORY_KEY, Java.KEY);
    setName(PmdConstants.REPOSITORY_NAME);
    this.fileSystem = fileSystem;
    this.xmlRuleParser = xmlRuleParser;
  }

  @Override
  public List createRules() {
    List rules = Lists.newArrayList();
    rules.addAll(xmlRuleParser.parse(getClass().getResourceAsStream("/org/sonar/plugins/pmd/rules.xml")));
    for (File userExtensionXml : fileSystem.getExtensions(PmdConstants.REPOSITORY_KEY, "xml")) {
      rules.addAll(xmlRuleParser.parse(userExtensionXml));
    }
    return rules;
  }
}