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package ch.epfl.xblast;

import ch.epfl.cs108.Sq;

import java.util.Collection;
import java.util.Objects;

/**
 * ArgumentChecker.
 *
 * @author Pacien TRAN-GIRARD (261948)
 * @author Timothée FLOURE (257420)
 */
public final class ArgumentChecker {

    /**
     * Returns the given value if it is non-negative.
     *
     * @param v the tested value
     * @return the given value if non-negative
     * @throws IllegalArgumentException if the value is inferior to 0
     */
    public static int requireNonNegative(int v) {
        if (v < 0)
            throw new IllegalArgumentException();

        return v;
    }

    /**
     * Requires the given Collection to be non-empty and returns it or throw an IllegalArgumentException otherwise.
     *
     * @param c   the Collection to check
     * @param <T> the Collection type
     * @return the checked Collection
     */
    public static <T extends Collection> T requireNonEmpty(T c) {
        if (Objects.requireNonNull(c).isEmpty())
            throw new IllegalArgumentException();

        return c;
    }

    /**
     * Requires the given Sequence to be non-empty and returns it or throw an IllegalArgumentException otherwise.
     *
     * @param s   the sequence to check
     * @param <T> the sequence type
     * @return the checked sequence
     */
    public static <T extends Sq> T requireNonEmpty(T s) {
        if (Objects.requireNonNull(s).isEmpty())
            throw new IllegalArgumentException();

        return s;
    }

}