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.other;
  
  import com.alibaba.p3c.pmd.lang.AbstractXpathRule;
  import com.alibaba.p3c.pmd.lang.java.util.ViolationUtils;
  
  import net.sourceforge.pmd.lang.ast.Node;
  
  /**
   * [Mandatory] The return type of Math.random() is double, value range is 0&lt;=x&lt;1 (0 is possible).
   * If a random integer is required, do not multiply x by 10 then round the result.
   * The correct way is to use nextInt or nextLong method which belong to Random Object.
   *
   * @author keriezhang
   * @date 2017/04/14
   */
  public class AvoidMissUseOfMathRandomRule extends AbstractXpathRule {
  
      private static final String XPATH =
          "//PrimaryExpression[./PrimaryPrefix/Name[@Image='Math.random'] and "
              + "../../MultiplicativeExpression/PrimaryExpression/PrimaryPrefix/Literal[matches(@Image, '^\\d+$')] and "
              + "../../../../../../CastExpression/Type/PrimitiveType[matches(@Image, '^(int|long)$')]"
              + "]";
  
      public AvoidMissUseOfMathRandomRule() {
          setXPath(XPATH);
      }
  
      @Override
      public void addViolation(Object data, Node node, String arg) {
          ViolationUtils.addViolationWithPrecisePosition(this, node, data);
      }
  }
  