DefaultLazyTree.java

/*
 * Copyright (c) 2013, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
 * 
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 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright
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 * Redistributions in binary form must reproduce the above copyright
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 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-util nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package com.sri.ai.util.collect;

import java.util.Iterator;

import com.google.common.annotations.Beta;
import com.sri.ai.util.Util;
import com.sri.ai.util.base.NullaryFunction;

/**
 * An immutable implementation of {@link LazyTree}.
 * 
 * @author braz
 *
 */
@Beta
class DefaultLazyTree<E> implements LazyTree<E> {
	private E information;
	private Iterator<NullaryFunction<LazyTree<E>>> subTreeMakers;
	
	public DefaultLazyTree(E information) {
		this(information, Util.iterator());
	}

	public DefaultLazyTree(Iterator<NullaryFunction<LazyTree<E>>> subTreeMakers) {
		this(null, subTreeMakers);
	}

	public DefaultLazyTree(E information, Iterator<NullaryFunction<LazyTree<E>>> subTreeMakers) {
		super();
		this.information = information;
		this.subTreeMakers = subTreeMakers;
	}

	@Override
	public E getInformation() {
		return information;
	}

	@Override
	public Iterator<NullaryFunction<LazyTree<E>>> getSubTreeMakers() {
		return subTreeMakers;
	}
}