org.apache.commons.collections4.functors

Class WhileClosure<E>

  • All Implemented Interfaces:
    Closure<E> 

    public class WhileClosure<E>
extends Object
implements Closure<E>
    Closure implementation that executes a closure repeatedly until a condition is met, like a do-while or while loop.

    WARNING: from v4.1 onwards this class will not be serializable anymore in order to prevent potential remote code execution exploits. Please refer to COLLECTIONS-580 for more details.

    Since:
    3.0

    • Constructor Detail

      • WhileClosure

        public WhileClosure(Predicate<? super E> predicate,
                    Closure<? super E> closure,
                    boolean doLoop)
        Constructor that performs no validation. Use whileClosure if you want that.
        Parameters:
        predicate - the predicate used to evaluate when the loop terminates, not null
        closure - the closure the execute, not null
        doLoop - true to act as a do-while loop, always executing the closure once

    • Method Detail

      • whileClosure

        public static <E> Closure<E> whileClosure(Predicate<? super E> predicate,
                                          Closure<? super E> closure,
                                          boolean doLoop)
        Factory method that performs validation.
        Type Parameters:
        E - the type that the closure acts on
        Parameters:
        predicate - the predicate used to evaluate when the loop terminates, not null
        closure - the closure the execute, not null
        doLoop - true to act as a do-while loop, always executing the closure once
        Returns:
        the while closure
        Throws:
        NullPointerException - if the predicate or closure is null

      • execute

        public void execute(E input)
        Executes the closure until the predicate is false.
        Specified by:
        execute in interface  Closure<E>
        Parameters:
        input - the input object

      • getPredicate

        public Predicate<? super E> getPredicate()
        Gets the predicate in use.
        Returns:
        the predicate
        Since:
        3.1

      • getClosure

        public Closure<? super E> getClosure()
        Gets the closure.
        Returns:
        the closure
        Since:
        3.1

      • isDoLoop

        public boolean isDoLoop()
        Is the loop a do-while loop.
        Returns:
        true is do-while, false if while
        Since:
        3.1