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JHotDraw8 Immutable Collections

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/*
 * @(#)ReadOnlySequencedSetFacade.java
 * Copyright © 2023 The authors and contributors of JHotDraw. MIT License.
 */
package org.jhotdraw8.icollection.facade;

import org.jhotdraw8.icollection.readonly.ReadOnlySequencedSet;

import java.util.Iterator;
import java.util.SequencedSet;
import java.util.Spliterator;
import java.util.function.IntSupplier;
import java.util.function.Predicate;
import java.util.function.Supplier;

/**
 * Provides a {@link ReadOnlySequencedSet} facade to a set of {@code SequencedSet} functions.
 *
 * @param  the element type
 * @author Werner Randelshofer
 */
public class ReadOnlySequencedSetFacade extends ReadOnlySetFacade
        implements ReadOnlySequencedSet {

    final Supplier getFirstFunction;
    final Supplier getLastFunction;
    final Supplier> reverseIteratorFunction;

    public ReadOnlySequencedSetFacade(ReadOnlySequencedSet backingSet) {
        this(backingSet::iterator, () -> backingSet.readOnlyReversed().iterator(), backingSet::size,
                backingSet::contains, backingSet::getFirst, backingSet::getLast, Spliterator.SIZED | Spliterator.DISTINCT);
    }

    public ReadOnlySequencedSetFacade(SequencedSet backingSet) {
        this(backingSet::iterator, () -> backingSet.reversed().iterator(), backingSet::size,
                backingSet::contains, backingSet::getFirst, backingSet::getLast, Spliterator.SIZED | Spliterator.DISTINCT);
    }

    public ReadOnlySequencedSetFacade(Supplier> iteratorFunction,
                                      Supplier> reverseIteratorFunction,
                                      IntSupplier sizeFunction,
                                      Predicate