de.mrapp.parser.feed.common.nullobject.AbstractFeedElementNullObject Maven / Gradle / Ivy

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/*
 * JavaFeedParserCommon Copyright 2013-2014 Michael Rapp
 *
 * 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 3 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, see . 
 */
package de.mrapp.parser.feed.common.nullobject;

import java.util.Collection;
import java.util.LinkedList;

import de.mrapp.parser.feed.common.datastructure.Attribute;
import de.mrapp.parser.feed.common.datastructure.Element;
import de.mrapp.parser.feed.common.datastructure.Pair;
import de.mrapp.parser.feed.common.model.FeedElement;

/**
 * An abstract base class for all null objects, which represent a null instance
 * of an element of a feed, which implements the interface {@link FeedElement}.
 * 
 * @author Michael Rapp
 * 
 * @since 1.0.0
 */
public abstract class AbstractFeedElementNullObject implements
		FeedElementNullObject {

	/**
	 * The constant serial version UID.
	 */
	private static final long serialVersionUID = 1L;

	@Override
	public final boolean hasAdditionalChildren() {
		return false;
	}

	@Override
	public final Collection getAdditionalChildren() {
		return new LinkedList();
	}

	@Override
	public final boolean hasAdditionalAttributes() {
		return false;
	}

	@Override
	public final Collection getAdditionalAttributes() {
		return new LinkedList();
	}

	@Override
	public final boolean hasAdditionalValue() {
		return false;
	}

	@Override
	public final String getAdditionalValue() {
		return null;
	}

	@Override
	public final boolean hasDescendingAdditionalChildren() {
		return false;
	}

	@Override
	public final Collection> getDescendingAdditionalChildren() {
		return new LinkedList>();
	}

	@Override
	public final boolean hasDescendingAdditionalAttributes() {
		return false;
	}

	@Override
	public final Collection> getDescendingAdditionalAttributes() {
		return new LinkedList>();
	}

	@Override
	public final boolean hasDescendingAdditionalValues() {
		return false;
	}

	@Override
	public final Collection> getDescendingAdditionalValues() {
		return new LinkedList>();
	}

	@Override
	public abstract FeedElementNullObject clone()
			throws CloneNotSupportedException;

}