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/**

* @name Dead class

* @description Dead classes add unnecessary complexity.

* @kind problem

* @problem.severity recommendation

* @precision medium

* @id java/dead-class

* @tags maintainability

* useless-code

* external/cwe/cwe-561

*/

import semmle.code.java.deadcode.DeadCode

from DeadClass c, Element origin, string reason

where

not c.getFile().isKotlinSourceFile() and

not origin.getFile().isKotlinSourceFile() and

if exists(DeadRoot root | root = c.getADeadRoot() | not root = c.getACallable())

then (

// Report a list of the dead roots.

origin = c.getADeadRoot() and

not origin = c.getACallable() and

// There are uses of this class from outside the class.

reason = " is only used from dead code originating at $@."

) else (

// There are no dead roots outside this class.

origin = c and

if c.isUnusedOutsideClass()

then

// Never accessed outside this class, so it's entirely unused.

reason = " is entirely unused."

else

// There are no dead roots outside the class, but the class has a possible liveness cause

// external to the class, so it must be accessed from at least one dead-code cycle.

reason = " is only used from or in a dead-code cycle."

)

select c, "The class " + c.getName() + reason, origin, origin.getName()