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• F.java

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com.shapesecurity.functional.F Maven / Gradle / Ivy

/*
 * Copyright 2014 Shape Security, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.shapesecurity.functional;

import javax.annotation.CheckReturnValue;
import javax.annotation.Nonnull;

@CheckReturnValue
@FunctionalInterface
public interface F {
    @Nonnull
    static  F id() {
        return o -> o;
    }

    @Nonnull
    static  F constant(@Nonnull final B b) {
        return a -> b;
    }

    @Nonnull
    static  F2 uncurry(@Nonnull final F> f) {
        return (a, b) -> f.apply(a).apply(b);
    }

    @Nonnull
    static  F> flip(@Nonnull final F> f) {
        return b -> a -> f.apply(a).apply(b);
    }

    @Nonnull
    R apply(@Nonnull A a);

    @Nonnull
    default  F compose(@Nonnull final F f) {
        return c -> this.apply(f.apply(c));
    }


    @Nonnull
    default  F then(@Nonnull final F f) {
        return c -> f.apply(this.apply(c));
    }
}