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.oop;
  
  import java.util.List;
  
  import com.alibaba.p3c.pmd.lang.java.rule.AbstractAliRule;
  import com.alibaba.p3c.pmd.lang.java.util.ViolationUtils;
  
  import net.sourceforge.pmd.lang.ast.Node;
  import net.sourceforge.pmd.lang.java.ast.ASTLiteral;
  import net.sourceforge.pmd.lang.java.ast.ASTName;
  import net.sourceforge.pmd.lang.java.ast.ASTPrimaryPrefix;
  import net.sourceforge.pmd.lang.java.ast.ASTVariableInitializer;
  import org.jaxen.JaxenException;
  
  /**
   * [Mandatory] Avoid using the constructor BigDecimal(double) to convert double value to a BigDecimal object.
   *
   * @author zenghou.fw
   * @date 2019/04/02
   */
  public class BigDecimalAvoidDoubleConstructorRule extends AbstractAliRule {
  
      private static final String XPATH =
          "Expression/PrimaryExpression/PrimaryPrefix/AllocationExpression/Arguments[preceding-sibling::ClassOrInterfaceType[@Image = 'BigDecimal']]"
              + "/ArgumentList/Expression/PrimaryExpression/PrimaryPrefix";
  
      @Override
      public Object visit(ASTVariableInitializer node, Object data) {
          try {
              List<Node> invocations = node.findChildNodesWithXPath(XPATH);
              if (invocations == null || invocations.isEmpty()) {
                  return super.visit(node, data);
              }
              ASTPrimaryPrefix expression = (ASTPrimaryPrefix)invocations.get(0);
  
              if (isDoubleLiteral(expression) || isDoubleVariable(expression)) {
                      addViolationWithMessage(data, node,
                          "java.oop.BigDecimalAvoidDoubleConstructorRule.violation.msg", null);
              }
  
          } catch (JaxenException e) {
              throw new RuntimeException("XPath expression " + XPATH + " failed: " + e.getLocalizedMessage(), e);
          }
          return super.visit(node, data);
      }
  
  
      @Override
      public void addViolation(Object data, Node node, String arg) {
          ViolationUtils.addViolationWithPrecisePosition(this, node, data,
              "java.oop.BigDecimalAvoidDoubleConstructorRule.violation.msg");
      }
  
      private boolean isDoubleLiteral(ASTPrimaryPrefix node) {
          ASTLiteral literal = node.getFirstChildOfType(ASTLiteral.class);
          return literal != null && literal.isDoubleLiteral();
      }
  
      private boolean isDoubleVariable(ASTPrimaryPrefix node) {
          ASTName name = node.getFirstChildOfType(ASTName.class);
          return name != null && Double.class ==  name.getType();
      }
  }
  