/**
 * Copyright (C) 2001-2017 by RapidMiner and the contributors
 * 
 * Complete list of developers available at our web site:
 * 
 * http://rapidminer.com
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero 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
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with this program.
 * If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.condition;

import com.rapidminer.operator.DefaultIODescription;
import com.rapidminer.operator.IllegalInputException;
import com.rapidminer.operator.Operator;
import com.rapidminer.operator.OperatorChain;
import com.rapidminer.operator.WrongNumberOfInnerOperatorsException;


/**
 * Checks if all inner operators are able to handle the given input and will deliver the desired
 * output.
 * 
 * @author Ingo Mierswa ingomierswa Exp $
 */
@SuppressWarnings("deprecation")
public class AllInnerOperatorCondition implements InnerOperatorCondition {

	/**
	 * The array of classes which is given to the inner chain of operators described by this
	 * InnerOpDesc object.
	 */
	private final Class<?>[] willGet;

	/**
	 * The array of classes which must be delivered by the inner chain of operators described by
	 * this InnerOpDesc object.
	 */
	private final Class<?>[] mustDeliver;

	public AllInnerOperatorCondition(Class<?>[] willGet, Class<?>[] mustDeliver) {
		this.willGet = willGet;
		this.mustDeliver = mustDeliver;
	}

	@Override
	public Class<?>[] checkIO(OperatorChain chain, Class<?>[] input)
			throws IllegalInputException, WrongNumberOfInnerOperatorsException {
		if (chain.getNumberOfOperators() == 0) {
			throw new WrongNumberOfInnerOperatorsException(chain, chain.getMinNumberOfInnerOperators(),
					chain.getMaxNumberOfInnerOperators(), 0);
		}
		Class<?>[] innerOutput = input;
		for (int i = 0; i < chain.getNumberOfOperators(); i++) {
			Operator operator = chain.getOperator(i);
			innerOutput = operator.checkIO(willGet);
			for (int j = 0; j < mustDeliver.length; j++) {
				if (!DefaultIODescription.containsClass(mustDeliver[j], innerOutput)) {
					throw new IllegalInputException(chain, operator, mustDeliver[j]);
				}
			}
		}
		return innerOutput;
	}

	@Override
	public String toHTML() {
		StringBuffer result = new StringBuffer("Each inner operator must be able to handle [");
		for (int i = 0; i < willGet.length; i++) {
			if (i != 0) {
				result.append(", ");
			}
			result.append(willGet[i].getSimpleName());
		}
		result.append("] and must deliver [");
		for (int i = 0; i < mustDeliver.length; i++) {
			if (i != 0) {
				result.append(", ");
			}
			result.append(mustDeliver[i].getSimpleName());
		}
		result.append("].");
		return result.toString();
	}
}