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Some collection interfaces and implementations

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/*
 * Copyright (c) 2017 Torsten Krause, Markenwerk GmbH
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package net.markenwerk.commons.collections.sources;

import java.security.CodeSource;
import java.util.Collection;

import net.markenwerk.commons.iterators.EmptyIterator;
import net.markenwerk.commons.iterators.ProtectedIterator;

/**
 * An {@link EmptySource} is an {@link AbstractSource} that is empty;
 * 
 * @param 
 *            The payload type.
 * @author Torsten Krause (tk at markenwerk dot net)
 * @since 1.0.0
 */
public final class EmptySource extends AbstractSource {

	/**
	 * Creates a new {@link CodeSource} for the given {@link Collection}.
	 */
	public EmptySource() {
	}

	@Override
	public int size() {
		return 0;
	}

	@Override
	public ProtectedIterator iterator() {
		return new EmptyIterator();
	}

}