resources.report.rules.pmd.ClassCastExceptionWithToArray.html Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of sanity4j Show documentation

Sanity4J was created to simplify running multiple static code analysis tools on the Java projects. It provides a single entry point to run all the selected tools and produce a consolidated report, which presents all findings in an easily accessible manner.

The newest version!



ClassCastExceptionWithToArray


ClassCastExceptionWithToArray
if you need to get an array of a class from your Collection,
you should pass an array of the desidered class
as the parameter of the toArray method. Otherwise you will get a
ClassCastException.
  
		
		
		    
    			This rule is defined by the following XPath expression:
    			
    			
    
//CastExpression[Type/ReferenceType/ClassOrInterfaceType[@Image !=
"Object"]]//PrimaryExpression
[
 PrimaryPrefix/Name[ends-with(@Image, '.toArray')]
 and
 PrimarySuffix/Arguments[count(*) = 0]
and
count(PrimarySuffix) = 1
]

    
  
		    
		    
	    
	    
        
        
        Example:
            
                    

import java.util.ArrayList;
import java.util.Collection;

public class Test {

    public static void main(String[] args) {
        Collection c=new ArrayList();
        Integer obj=new Integer(1);
        c.add(obj);

        // this would trigger the rule (and throw a ClassCastException
if executed)
        Integer[] a=(Integer [])c.toArray();

        // this wouldn't trigger the rule
        Integer[] b=(Integer [])c.toArray(new Integer[c.size()]);
    }
}