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// Burton Computer Corporation
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package org.javimmutable.collections.tree;

import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.JImmutableSet;
import org.javimmutable.collections.common.AbstractJImmutableSet;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import java.util.Comparator;
import java.util.Set;
import java.util.TreeSet;

@Immutable
public class JImmutableTreeSet
        extends AbstractJImmutableSet
{
    @SuppressWarnings("unchecked")
    private static final JImmutableTreeSet EMPTY = new JImmutableTreeSet(new ComparableComparator());

    private final Comparator comparator;

    private JImmutableTreeSet(Comparator comparator)
    {
        this(JImmutableTreeMap.of(comparator), comparator);
    }

    private JImmutableTreeSet(JImmutableMap map,
                              Comparator comparator)
    {
        super(map);
        this.comparator = comparator;
    }

    @Nonnull
    @Override
    public JImmutableTreeSet deleteAll()
    {
        return of(comparator);
    }

    public Comparator getComparator()
    {
        return comparator;
    }

    @SuppressWarnings("unchecked")
    public static > JImmutableTreeSet of()
    {
        return (JImmutableTreeSet)EMPTY;
    }

    public static  JImmutableTreeSet of(Comparator comparator)
    {
        return new JImmutableTreeSet<>(comparator);
    }

    @Override
    protected JImmutableSet create(JImmutableMap map)
    {
        return new JImmutableTreeSet<>(map, comparator);
    }

    @Override
    protected Set emptyMutableSet()
    {
        return new TreeSet<>(comparator);
    }
}