edu.berkeley.nlp.util.ConcatenationMap Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of berkeleyparser Show documentation

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

The newest version!

package edu.berkeley.nlp.util;

import java.util.AbstractMap;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Union of two maps (sort of). Doesn't handle duplicate keys (keys in both
 * maps). Unmodifiable.
 * 
 * @author adampauls
 * 
 * @param 
 */
public class ConcatenationMap extends AbstractMap
{
	private Set> entrySet;

	@Override
	public Set> entrySet()
	{
		if (entrySet == null)
		{
			List>> list = new ArrayList>>();
			for (Map map : maps)
			{
				list.add(map.entrySet());
			}
			entrySet = new ConcatenationSet>(list);
		}
		return entrySet;
	}

	@Override
	public V get(Object arg0)
	{
		for (Map map : maps)
		{
			V v = map.get(arg0);
			if (v != null) return v;
		}
		return null;
	}



	@Override
	public boolean containsKey(Object arg0)
	{
		for (Map map : maps)
		{
			if (map.containsKey(arg0)) return true;
		}
		return false;
	}

	private Collection> maps;

	private int size = 0;

	public ConcatenationMap(Collection> maps)
	{
		this.maps = maps;
		for (Map set : maps)
		{

			size += set.size();
		}
	}

	
	
	@Override
	public int size()
	{
		return size;

	}

}