function 응용

public class FunctionRef { public static void ifFalseThen(boolean bool, Runnable runnable) { if ( !bool ) runnable.run(); } public static void ifTrueThen(boolean bool, Runnable runnable) { if ( bool ) runnable.run(); } public static T ifFalseApply(boolean bool, Supplier runnable) { if ( !bool ) return runnable.get(); else return null; } public static T ifTrueApply(boolean bool, Supplier runnable) { if ( bool ) return runnable.get(); else return null; } public static T ifApply(boolean bool, Supplier runnable, Supplier falseSupply) { if ( bool ) return runnable.get(); else return falseSupply.get(); } public static void ifThen(boolean bool, Runnable trueRun, Runnable falseRun) { if ( bool ) trueRun.run(); else falseRun.run(); } public static void ifTrueThen(Supplier supplier, Runnable runnable) { if ( supplier.get() ) runnable.run(); } public static void ifFalseThen(Supplier supplier, Runnable runnable) { if ( !supplier.get() ) runnable.run(); } public static void ifThen(Supplier supplier, Runnable trueThen, Runnable falseThen) { if ( supplier.get() ) trueThen.run(); else falseThen.run(); } public static void ifTrueThrow(boolean bool, Exception e) throws Exception { if (bool) throw e; } }

static 메서드로 condition, successFunction, failFunction 등을 선언해놓은 것은 매우 재미있는 것 같다.

덕분에 메서드 체이닝도 되고