net.sf.saxon.z.IntPredicateLambda Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of Saxon-HE Show documentation

The XSLT and XQuery Processor

There is a newer version: 12.5

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2023 Saxonica Limited
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.z;

import java.util.function.IntPredicate;

/**
 * This class allows an integer predicate (a boolean function of an integer) to be written as a lambda
 * expression, in a way that works both in Java and C#. It is needed because interfaces and delegates
 * are interchangeable in Java (through the mechanism of "functional interfaces"), but the same is not
 * the case in C#.
 */

public class IntPredicateLambda implements IntPredicateProxy {

    IntPredicate lambda;
    private IntPredicateLambda(IntPredicate lambda) {
        this.lambda = lambda;
    }

    /**
     * Implement an integer predicate as a lambda expression
     * @param lambda an implementation of the functional interface {@link IntPredicate}, generally
     *               supplied as a lambda expression (for example {@literal i -> i > 0} for a predicate
     *               that matches all positive integers).
     * @return the integer predicate
     */
    public static IntPredicateProxy of(IntPredicate lambda) {
        return new IntPredicateLambda(lambda);
    }

    @Override
    public boolean test(int value) {
        return lambda.test(value);
    }
}