content: /*
   * Copyright 1999-2017 Alibaba Group.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alibaba.p3c.pmd.lang.java.rule.naming;
  
  import com.alibaba.p3c.pmd.I18nResources;
  import com.alibaba.p3c.pmd.lang.AbstractXpathRule;
  import com.alibaba.p3c.pmd.lang.java.util.ViolationUtils;
  
  import net.sourceforge.pmd.lang.ast.Node;
  
  /**
   * [Mandatory] Package should be named in lowercase characters. There should be only one English word after
   * each dot. Package names are always in singular format while class name can be in plural format if necessary.
   *
   * @author changle.lq
   * @date 2017/04/16
   */
  public class PackageNamingRule extends AbstractXpathRule {
      private static final String XPATH = "//PackageDeclaration/Name"
          + "[not (matches(@Image, '^[a-z0-9]+(\\.[a-z][a-z0-9]*)*$'))]";
  
      public PackageNamingRule() {
          setXPath(XPATH);
      }
  
      @Override
      public void addViolation(Object data, Node node, String arg) {
          ViolationUtils.addViolationWithPrecisePosition(this, node, data,
              I18nResources.getMessage("java.naming.PackageNamingRule.violation.msg", node.getImage()));
      }
  }
  