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

EmptyMethodInAbstractClassShouldBeAbstract
An empty method in an abstract class should be abstract instead, as developer may rely on this empty implementation
rather than code the appropriate one.
        

		
		
		    
    			
This rule is defined by the following XPath expression:
    			
    			
    
                
                    //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
							(
								(
									(boolean(./Block/BlockStatement/Statement/ReturnStatement/Expression/PrimaryExpression/PrimaryPrefix/Literal[@Image = '']) = 'true' )
								)
								and
								( count (./Block/*) = 1 )
							)
                            or
                            ( count (./Block/*) = 0 )
                        ]
                
             
  
		    
		    
	    
	    
        
        
        
Example:
            
    
                
        	
				public abstract class ShouldBeAbstract
				{
				    public Object couldBeAbstract()
				    {
					// Should be abstract method ?
					return null;
				   	}

				    public void couldBeAbstract()
				    {
				    }
				}