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.concurrent;
  
  import java.util.Timer;
  
  import com.alibaba.p3c.pmd.lang.java.rule.AbstractAliRule;
  
  import net.sourceforge.pmd.lang.java.ast.ASTPrimaryExpression;
  import net.sourceforge.pmd.lang.java.ast.ASTVariableDeclarator;
  import net.sourceforge.pmd.lang.java.ast.AbstractJavaTypeNode;
  
  /**
   * [Mandatory] Run multiple TimeTask by using ScheduledExecutorService rather than Timer
   * because Timer will kill all running threads in case of failing to catch exception.
   *
   * @author caikang
   * @date 2016/11/15
   */
  public class AvoidUseTimerRule extends AbstractAliRule {
      @Override
      public Object visit(ASTVariableDeclarator node, Object data) {
          checkType(node, data);
          return super.visit(node, data);
      }
  
      @Override
      public Object visit(ASTPrimaryExpression node, Object data) {
          ASTVariableDeclarator variableDeclarator = node.getFirstParentOfType(ASTVariableDeclarator.class);
          if (variableDeclarator != null && variableDeclarator.getType() == Timer.class) {
              return super.visit(node, data);
          }
          checkType(node, data);
          return super.visit(node, data);
      }
  
      private void checkType(AbstractJavaTypeNode node, Object data) {
          if (node.getType() == Timer.class) {
              addViolationWithMessage(data, node,"java.concurrent.AvoidUseTimerRule.violation.msg");
          }
      }
  }
  