package org.jboss.windup.graph.frames;

import java.util.Iterator;

import com.tinkerpop.blueprints.Vertex;
import com.tinkerpop.frames.VertexFrame;

/**
 * Converts an {@link Iterable<? extends VertexFrame>} to {@link Iterable<Vertex>}.
 */
public class VertexFromFramedIterable implements Iterable<Vertex>
{
    private final Iterable<? extends VertexFrame> iterable;

    /**
     * Converts the provided {@link Iterable<? extends VertexFrame>} to {@link Iterable<Vertex>}.
     */
    public VertexFromFramedIterable(final Iterable<? extends VertexFrame> iterable)
    {
        this.iterable = iterable;
    }

    @Override
    public Iterator<Vertex> iterator()
    {
        return new Iterator<Vertex>()
        {
            private final Iterator<? extends VertexFrame> iterator = iterable.iterator();

            public void remove()
            {
                throw new UnsupportedOperationException();
            }

            public boolean hasNext()
            {
                return this.iterator.hasNext();
            }

            public Vertex next()
            {
                return iterator.next().asVertex();
            }
        };
    }
}