https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar 
/*
 * Copyright (c) 2016 Goldman Sachs.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompany this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 */

package org.eclipse.collections.impl.block.procedure;

import org.eclipse.collections.api.block.predicate.Predicate;
import org.eclipse.collections.api.block.procedure.Procedure;


IfProcedure allows developers to evaluate the specified procedure only when either predicate returns true.
If the result of evaluating the predicate is false, and the developer has specified that there
is an elseProcedure, then the elseProcedure is evaluated.

/**
 * IfProcedure allows developers to evaluate the specified procedure only when either predicate returns true.
 * If the result of evaluating the predicate is false, and the developer has specified that there
 * is an elseProcedure, then the elseProcedure is evaluated.
 */
public final class IfProcedure<T> implements Procedure<T>
{
    private static final long serialVersionUID = 1L;

    private final Predicate<? super T> predicate;
    private final Procedure<? super T> procedure;
    private final Procedure<? super T> elseProcedure;

    public IfProcedure(
            Predicate<? super T> predicate,
            Procedure<? super T> procedure,
            Procedure<? super T> elseProcedure)
    {
        this.predicate = predicate;
        this.procedure = procedure;
        this.elseProcedure = elseProcedure;
    }

    public IfProcedure(Predicate<? super T> predicate, Procedure<? super T> procedure)
    {
        this(predicate, procedure, null);
    }

    @Override
    public void value(T object)
    {
        if (this.predicate.accept(object))
        {
            this.procedure.value(object);
        }
        else
        {
            if (this.elseProcedure != null)
            {
                this.elseProcedure.value(object);
            }
        }
    }

    @Override
    public String toString()
    {
        return "new IfProcedure(" + this.predicate + ", " + this.procedure + ", " + this.elseProcedure + ')';
    }
}