The JWare/AntX build-core(helpers/go) package contains a set of strategy classes that help conditionally executed components determine whether they should or should not execute. This package contains two kinds of of classes: standalone utility strategy implementations and custom, instance-bound "Go" test methods.
Generally you would use the generic utility strategies directly for one-off implementations and use the various "Go" instance-bound test classes to implement one of the various AntX Conditional implementations.