CapabilityCheck.java example

Explorer
rapidminer-vega-master
/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.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.learner;

import com.rapidminer.example.Attribute;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.example.Tools;
import com.rapidminer.operator.Operator;
import com.rapidminer.operator.OperatorCapability;
import com.rapidminer.operator.OperatorException;
import com.rapidminer.operator.UserError;
import com.rapidminer.tools.Ontology;

/**
 * Checks if the the given learner can work on the example set.
 *
 * @author Ingo Mierswa
 */
public class CapabilityCheck {

	private CapabilityProvider capabilityProvider;

	private boolean onlyWarn;

	public CapabilityCheck(CapabilityProvider provider, boolean onlyWarn) {
		this.capabilityProvider = provider;
		this.onlyWarn = onlyWarn;
	}

	/**
	 * Checks if this learner can be used for the given example set, i.e. if it
	 * has sufficient capabilities.
	 */
	public void checkLearnerCapabilities(Operator learningOperator, ExampleSet exampleSet) throws OperatorException {
		try {
			// nominal attributes
			if (Tools.containsValueType(exampleSet, Ontology.NOMINAL)) {
				if (Tools.containsValueType(exampleSet, Ontology.BINOMINAL)) {
					if (!capabilityProvider.supportsCapability(OperatorCapability.BINOMINAL_ATTRIBUTES))
						throw new UserError(learningOperator, 501, learningOperator.getName(), OperatorCapability.BINOMINAL_ATTRIBUTES.getDescription());
				} else {
					if (!capabilityProvider.supportsCapability(OperatorCapability.POLYNOMINAL_ATTRIBUTES))
						throw new UserError(learningOperator, 501, learningOperator.getName(), OperatorCapability.POLYNOMINAL_ATTRIBUTES.getDescription());
				}
			} 

			// numerical attributes
			if ((Tools.containsValueType(exampleSet, Ontology.NUMERICAL)) && !capabilityProvider.supportsCapability(OperatorCapability.NUMERICAL_ATTRIBUTES))
				throw new UserError(learningOperator, 501, learningOperator.getName(), OperatorCapability.NUMERICAL_ATTRIBUTES.getDescription());

			// label
			Attribute labelAttribute = exampleSet.getAttributes().getLabel();
			if (labelAttribute != null) {
				if (labelAttribute.isNominal()) {
					if (labelAttribute.getMapping().size() == 1) {
						if (!(capabilityProvider.supportsCapability(OperatorCapability.ONE_CLASS_LABEL))) {
							throw new UserError(learningOperator, 502, learningOperator.getName());						
						}
					} else {
						if (labelAttribute.getMapping().size() == 2) {
							if (!capabilityProvider.supportsCapability(OperatorCapability.BINOMINAL_LABEL))
								throw new UserError(learningOperator, 501, learningOperator.getName(), OperatorCapability.BINOMINAL_LABEL.getDescription());
						} else {
							if (!capabilityProvider.supportsCapability(OperatorCapability.POLYNOMINAL_LABEL))
								throw new UserError(learningOperator, 501, learningOperator.getName(), OperatorCapability.POLYNOMINAL_LABEL.getDescription());
						}
					}
				} else {
					if (labelAttribute.isNumerical() && !capabilityProvider.supportsCapability(OperatorCapability.NUMERICAL_LABEL))
						throw new UserError(learningOperator, 501, learningOperator.getName(), OperatorCapability.NUMERICAL_LABEL.getDescription());
				}
			} else {
				if (!(capabilityProvider.supportsCapability(OperatorCapability.NO_LABEL))) {
					throw new UserError(learningOperator, 501, learningOperator.getName(), OperatorCapability.NO_LABEL.getDescription());						
				}
			}
			// missing values will only be checked with meta data to avoid data scan only for capability check.
		} catch (UserError e) {
			if (onlyWarn) {
				learningOperator.logWarning(e.getMessage());
			} else {
				throw e;
			}
		}
	}
}