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

When deriving an array of a specific class from your Collection, one should provide an array of the same class as the parameter of the toArray() method. Doing otherwise you will will result in a ClassCastException.



//CastExpression[Type/ReferenceType/ClassOrInterfaceType[@Image !=
"Object"]]/PrimaryExpression
[
 PrimaryPrefix/Name[ends-with(@Image, '.toArray')]
 and
 PrimarySuffix/Arguments[count(*) = 0]
and
count(PrimarySuffix) = 1
]


Example(s):



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 is fine and will not trigger the rule
Integer[] b = (Integer [])c.toArray(new Integer[c.size()]);