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

import org.javimmutable.collections.JImmutableMultiset;
import org.javimmutable.collections.JImmutableSet;
import org.javimmutable.collections.iterators.IteratorHelper;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import java.util.Iterator;
import java.util.Set;

@Immutable
public abstract class AbstractJImmutableSet
    implements JImmutableSet
{
    @Nonnull
    @Override
    public JImmutableSet getInsertableSelf()
    {
        return this;
    }

    @Override
    @Nonnull
    public JImmutableSet insertAll(@Nonnull Iterable values)
    {
        return union(values.iterator());
    }

    @Override
    @Nonnull
    public JImmutableSet insertAll(@Nonnull Iterator values)
    {
        return union(values);
    }

    @Override
    public boolean containsAll(@Nonnull Iterable values)
    {
        return containsAll(values.iterator());
    }

    @Override
    public boolean containsAll(@Nonnull Iterator values)
    {
        while (values.hasNext()) {
            if (!contains(values.next())) {
                return false;
            }
        }
        return true;
    }

    @Override
    public boolean containsAny(@Nonnull Iterable values)
    {
        return containsAny(values.iterator());
    }

    @Override
    public boolean containsAny(@Nonnull Iterator values)
    {
        while (values.hasNext()) {
            if (contains(values.next())) {
                return true;
            }
        }
        return false;
    }

    @Nonnull
    @Override
    public JImmutableSet deleteAll(@Nonnull Iterable other)
    {
        return deleteAll(other.iterator());
    }

    @Nonnull
    @Override
    public JImmutableSet union(@Nonnull Iterable other)
    {
        return union(other.iterator());
    }

    @Nonnull
    @Override
    public JImmutableSet intersection(@Nonnull Iterable other)
    {
        return intersection(other.iterator());
    }

    @Nonnull
    @Override
    public JImmutableSet intersection(@Nonnull JImmutableSet other)
    {
        return intersection(other.getSet());
    }

    @Nonnull
    @Override
    public Set getSet()
    {
        return SetAdaptor.of(this);
    }

    @Override
    public int hashCode()
    {
        return IteratorHelper.iteratorHashCode(iterator());
    }

    @Override
    public boolean equals(Object o)
    {
        if (o == this) {
            return true;
        } else if (o == null) {
            return false;
        } else if (o instanceof JImmutableMultiset) {
            return o.equals(this);
        } else if (o instanceof JImmutableSet) {
            return getSet().equals(((JImmutableSet)o).getSet());
        } else {
            return (o instanceof Set) && getSet().equals(o);
        }
    }

    @Override
    public String toString()
    {
        return IteratorHelper.iteratorToString(iterator());
    }

    /**
     * Implemented by derived classes to create a new empty Set
     */
    protected abstract Set emptyMutableSet();
}