/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys 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 "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.tools.collection;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * 
 */
public class ListTools {

	static public <T> List<T> collect(Iterator<T> it) {
		List<T> result = new ArrayList<T>();
		while (it.hasNext()) {
			result.add(it.next());
		}
		return result;
	}

	static public <T> T first(List<T> list) {
		if (list == null) {
			return null;
		}
		if (list.size() == 0) {
			return null;
		}
		return list.get(0);
	}

	static public <T> T last(List<T> list) {
		if (list == null) {
			return null;
		}
		if (list.size() == 0) {
			return null;
		}
		return list.get(list.size() - 1);
	}

	static public <T> List<T> with(T object) {
		List result = new ArrayList();
		result.add(object);
		return result;
	}

	static public <T> List<T> with(T object1, T object2) {
		List result = new ArrayList();
		result.add(object1);
		result.add(object2);
		return result;
	}

	static public <T> List<T> with(T object1, T object2, T object3) {
		List result = new ArrayList();
		result.add(object1);
		result.add(object2);
		result.add(object3);
		return result;
	}

	/**
	 * 
	 */
	private ListTools() {
		// tool class
	}

}
