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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 quality
 *       maintainability
 *       useless-code
 *       external/cwe/cwe-561
import semmle.code.java.deadcode.DeadCode
from DeadClass c, Element origin, string reason
  not c.getFile().isKotlinSourceFile() and
  not origin.getFile().isKotlinSourceFile() and
  if exists(DeadRoot root | root = c.getADeadRoot() | not root = c.getACallable())
    // 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 $@."
    // There are no dead roots outside this class.
    origin = c and
    if c.isUnusedOutsideClass()
      // Never accessed outside this class, so it's entirely unused.
      reason = " is entirely unused."
      // 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()

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