cz.jirutka.rsql.parser.ast.Arity Maven / Gradle / Ivy

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/*
 * The MIT License
 *
 * Copyright 2024 Edgar Asatryan .
 *
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package cz.jirutka.rsql.parser.ast;

/**
 * The arity of an operator.
 *
 * @since 2.3.0
 */
public interface Arity {

    /**
     * The minimum number of arguments operator can receive.
     *
     * @return The minimum number of arguments operator can receive. Positive or zero.
     * @apiNote The minimum values is always less than or equal to {@linkplain #max()}
     */
    int min();

    /**
     * The maximum number of arguments operator can receive.
     *
     * @return The maximum number of arguments operator can receive. Positive or zero.
     * @apiNote The maximum values is always greater than or equal to {@linkplain #min()}. For practically unlimited
     *     arity the implementations should return {@link Integer#MAX_VALUE}.
     */
    int max();

    /**
     * Creates arity with given {@code min} and {@code max}.
     *
     * @param min The minimum number of arguments. Must be zero or positive.
     * @param max The maximum number of arguments. Must be zero or positive and greater than or equal to {@code min}.
     * @return the created arity
     */
    static Arity of(int min, int max) {
        return new DynamicArity(min, max);
    }

    /**
     * Creates N-ary object.
     *
     * @param n The N.
     * @return the created arity
     */
    static Arity nary(int n) {
        return new NAry(n);
    }

    /**
     * Creates nullary object.
     *
     * @return the created arity
     */
    static Arity nullary() {
        return new NullAry();
    }



}