001/*
002 * Copyright © 2025 CUI-OpenSource-Software (info@cuioss.de)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package de.cuioss.test.generator.internal.net.java.quickcheck.generator.iterable;
017
018import de.cuioss.test.generator.internal.net.java.quickcheck.Generator;
019import de.cuioss.test.generator.internal.net.java.quickcheck.QuickCheck;
020import de.cuioss.test.generator.internal.net.java.quickcheck.generator.Generators;
021
022import java.util.Iterator;
023import java.util.NoSuchElementException;
024
025import static java.util.Objects.requireNonNull;
026
027public final class Iterables {
028
029    private Iterables() {
030    }
031
032    /**
033     * Convert a generator into a {@link Iterable iterable}.<br>
034     *
035     * The generator will be run {@link QuickCheck#MAX_NUMBER_OF_RUNS} times.
036     */
037    public static <T> Iterable<T> toIterable(final Generator<T> generator) {
038        return Generators.toIterable(generator);
039    }
040
041    /**
042     * Convert a generator into an {@link Iterable iterable}.
043     *
044     * @param numberOfRuns to execute the runner
045     */
046    public static <T> Iterable<T> toIterable(final Generator<T> generator, final int numberOfRuns) {
047        return Generators.toIterable(generator, numberOfRuns);
048    }
049
050    /**
051     * Calculate the size of an {@link Iterable}.
052     * <p>
053     * The size of an {@link Iterable} is the number of {@link Iterator#next()}
054     * calls not throwing a {@link NoSuchElementException}.
055     * </p>
056     *
057     * @param iterable to calculate the size of
058     */
059    public static <T> int sizeOf(Iterable<T> iterable) {
060        requireNonNull(iterable, "iterable");
061        int size = 0;
062        // noinspection StatementWithEmptyBody
063        for (Iterator<T> iter = iterable.iterator(); iter.hasNext(); iter.next(), size++)
064            ;
065        return size;
066    }
067}