/*******************************************************************************
 * Breakout Cave Survey Visualizer
 *
 * Copyright (C) 2014 James Edwards
 *
 * jedwards8 at fastmail dot fm
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *******************************************************************************/
package org.andork.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class IterableUtils {
	public static <E> void addAll(Iterable<? extends E> iterable, Collection<E> collection) {
		for (E elem : iterable) {
			collection.add(elem);
		}
	}

	public static <E> Iterable<E> iterable(final Iterator<E> iterator) {
		return new Iterable<E>() {
			@Override
			public Iterator<E> iterator() {
				return iterator;
			}
		};
	}

	public static Iterable<Float> range(final float start, final float end, final boolean includeEnd,
			final float step) {
		return new Iterable<Float>() {
			@Override
			public Iterator<Float> iterator() {
				return new Iterator<Float>() {
					float next = start;

					@Override
					public boolean hasNext() {
						return next < end || includeEnd && next == end;
					}

					@Override
					public Float next() {
						float result = next;

						if (includeEnd && next < end) {
							next = Math.min(next + step, end);
						} else {
							next += step;
						}

						return result;
					}

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

	public static <E> ArrayList<E> toArrayList(Iterable<E> iterable) {
		ArrayList<E> result = new ArrayList<E>();
		addAll(iterable, result);
		return result;
	}

	private IterableUtils() {

	}
}