/*
 * Copyright 2013 Robert von Burg <eitch@eitchnet.ch>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package li.strolch.runtime.query.inmemory;

import li.strolch.model.StrolchElement;
import li.strolch.utils.dbc.DBC;

/**
 * @author Robert von Burg <eitch@eitchnet.ch>
 */
public class NotSelector<T extends StrolchElement> extends BooleanSelector<T> {

	/**
	 * @param selector
	 */
	NotSelector(Selector<T> selector) {
		super(selector);
	}

	/**
	 * @throws UnsupportedOperationException
	 *             because a {@link NotSelector} can only work on a single {@link Selector}
	 */
	@Override
	public NotSelector<T> with(Selector<T> selector) {
		throw new UnsupportedOperationException("NotSelector can only have a single Selector"); //$NON-NLS-1$
	}

	@Override
	public boolean select(T element) {
		if (this.selectors == null || this.selectors.isEmpty())
			return true;
		DBC.PRE.assertTrue("Only one selector allowed!", this.selectors.size() == 1); //$NON-NLS-1$
		return !this.selectors.get(0).select(element);
	}
}
