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The Berkeley parser analyzes the grammatical structure of natural language using probabilistic context-free grammars (PCFGs).

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package edu.berkeley.nlp.util;

import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;

/**
 * Union of two sets (sort of). Doesn't remove duplicates. Unmodifiable.
 * 
 * @author adampauls
 * 
 * @param 
 */
public class ConcatenationSet extends AbstractSet
{
	@Override
	public boolean contains(Object arg0)
	{
		for (Set set : sets)
		{
			if (set.contains(arg0)) return true;
		}
		return false;
	}

	private Collection> sets;

	private int size = 0;

	public ConcatenationSet(Collection> sets)
	{
		this.sets = sets;
		for (Set set : sets)
		{

			size += set.size();
		}
	}

	@Override
	public Iterator iterator()
	{
		return new ConcatenationIterable(sets).iterator();
	}

	@Override
	public int size()
	{
		return size;

	}

}