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1   package net.sourceforge.pmd.rules.basic;
2   
3   import net.sourceforge.pmd.AbstractRule;
4   import net.sourceforge.pmd.RuleContext;
5   import net.sourceforge.pmd.SourceType;
6   import net.sourceforge.pmd.ast.ASTAllocationExpression;
7   import net.sourceforge.pmd.ast.ASTArguments;
8   import net.sourceforge.pmd.ast.ASTArrayDimsAndInits;
9   import net.sourceforge.pmd.ast.ASTClassOrInterfaceType;
10  import net.sourceforge.pmd.ast.ASTLiteral;
11  import net.sourceforge.pmd.ast.Node;
12  
13  public class BigIntegerInstantiation extends AbstractRule {
14  
15      public Object visit(ASTAllocationExpression node, Object data) {
16          Node type = node.jjtGetChild(0);
17          
18          if (!(type instanceof ASTClassOrInterfaceType)) {
19              return super.visit(node, data);            
20          }
21          
22          String img = ((ASTClassOrInterfaceType) type).getImage();
23          if (img.startsWith("java.math.")) {
24              img = img.substring(10);
25          }
26  
27          boolean jdk15 = ((RuleContext) data).getSourceType().compareTo(SourceType.JAVA_15) >= 0;
28          
29          if (("BigInteger".equals(img) || (jdk15 && "BigDecimal".equals(img))) &&
30                  (node.getFirstChildOfType(ASTArrayDimsAndInits.class) == null)
31          ) {
32              ASTArguments args = (ASTArguments) node.getFirstChildOfType(ASTArguments.class);
33              if (args.getArgumentCount() == 1) {
34                  ASTLiteral literal = (ASTLiteral) node.getFirstChildOfType(ASTLiteral.class);
35                  if (literal == null || literal.jjtGetParent().jjtGetParent().jjtGetParent().jjtGetParent().jjtGetParent() != args) {
36                      return super.visit(node, data);
37                  }
38  
39                  img = literal.getImage();
40                  if ((img.length() > 2 && img.charAt(0) == '"')) {
41                      img = img.substring(1, img.length() - 1);
42                  }
43                  
44                  if ("0".equals(img) || "1".equals(img) || (jdk15 && "10".equals(img))) {
45                      addViolation(data, node);
46                      return data;                
47                  }
48              }
49          }
50          return super.visit(node, data);
51      }
52  
53  }