/*
 * Copyright 1997-2024 Optimatika
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.ojalgo.ann;

import static org.ojalgo.function.constant.PrimitiveMath.ZERO;

import java.util.concurrent.ThreadLocalRandom;

import org.ojalgo.function.PrimitiveFunction;

final class NodeDropper implements PrimitiveFunction.Unary {

    static NodeDropper of(final double probabilityToKeep) {
        return new NodeDropper(probabilityToKeep);
    }

    private final double myProbabilityToKeep;

    NodeDropper(final double probabilityToKeep) {
        super();
        myProbabilityToKeep = probabilityToKeep;
    }

    public double invoke(final double arg) {
        if (ThreadLocalRandom.current().nextDouble() <= myProbabilityToKeep) {
            return arg;
        }
        return ZERO;
    }

}
