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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.

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EmptyMethodInAbstractClassShouldBeAbstract

EmptyMethodInAbstractClassShouldBeAbstract

Empty or auto-generated methods in an abstract class should be tagged as abstract. This helps to remove their inapproprate usage by developers who should be implementing their own versions in the concrete subclasses.


                
                    //ClassOrInterfaceDeclaration[@Abstract = 'true']
                        /ClassOrInterfaceBody
                        /ClassOrInterfaceBodyDeclaration
                        /MethodDeclaration[@Abstract = 'false' and @Native = 'false']
                        [
                            ( boolean(./Block[count(./BlockStatement) =  1]/BlockStatement/Statement/ReturnStatement/Expression/PrimaryExpression/PrimaryPrefix/Literal/NullLiteral) = 'true' )
                            or
                            ( boolean(./Block[count(./BlockStatement) =  1]/BlockStatement/Statement/ReturnStatement/Expression/PrimaryExpression/PrimaryPrefix/Literal[@Image = '0']) = 'true' )
                            or
                            ( boolean(./Block[count(./BlockStatement) =  1]/BlockStatement/Statement/ReturnStatement/Expression/PrimaryExpression/PrimaryPrefix/Literal[string-length(@Image) = 2]) = 'true' )
                            or
                            (./Block[count(./BlockStatement) =  1]/BlockStatement/Statement/EmptyStatement)
                            or
                            ( count (./Block/*) = 0 )
                        ]
                

Example(s):


        	
public abstract class ShouldBeAbstract {
    public Object couldBeAbstract() {
        // Should be abstract method ?
        return null;
    }

    public void couldBeAbstract() {
    }
}