EmptyIterator.java

/**
 * Copyright 2004-2016 Riccardo Solmi. All rights reserved.
 * This file is part of the Whole Platform.
 *
 * The Whole Platform is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The Whole Platform 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the Whole Platform. If not, see <http://www.gnu.org/licenses/>.
 */
package org.whole.lang.iterators;

import java.util.NoSuchElementException;

import org.whole.lang.bindings.IBindingScope;
import org.whole.lang.bindings.NullScope;
import org.whole.lang.model.IEntity;

/**
 * @author Riccardo Solmi
 */
public class EmptyIterator<E extends IEntity> extends AbstractCloneableIterator<E> {
	public IBindingScope lookaheadScope() {
		return NullScope.instance;
	}

    public boolean hasNext() {
        return false;
    }
	public E next() {
       	throw new NoSuchElementException();
	}

    public E lookahead() {
       	return null;
    }

    public void reset(IEntity entity) {
    }

	public void prune() {
	}

	public void set(E value) {
		throw new UnsupportedOperationException();
	}
	public void add(E value) {
		throw new UnsupportedOperationException();
	}
	public void remove() {
		throw new UnsupportedOperationException();
	}

    @Override
	public void toString(StringBuilder sb) {
		sb.append("empty()");
    }
}