/**
 * 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.example.table;

import com.rapidminer.example.Tools;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;


/**
 * Implementation of DataRow that is backed by a HashMap. Usually using the
 * {@link DoubleSparseArrayDataRow} should be more efficient.
 * 
 * @author Ingo Mierswa
 */
public class SparseMapDataRow extends DataRow {

	private static final long serialVersionUID = -7452459295368606029L;

	/** Maps the indices of attributes to the data. */
	private Map<Integer, Double> data = new ConcurrentHashMap<Integer, Double>();

	/** Returns the desired data for the given index. */
	@Override
	protected double get(int index, double defaultValue) {
		Double value = data.get(index);
		if (value != null) {
			return value.doubleValue();
		} else {
			return defaultValue;
		}
	}

	/** Sets the given data for the given index. */
	@Override
	protected void set(int index, double value, double defaultValue) {
		if (Tools.isDefault(defaultValue, value)) {
			data.remove(index);
		} else {
			data.put(index, value);
		}
	}

	/** Does nothing. */
	@Override
	protected void ensureNumberOfColumns(int numberOfColumns) {}

	/** Returns a string representation of the data row. */
	@Override
	public String toString() {
		return data.toString();
	}

	@Override
	public int getType() {
		return DataRowFactory.TYPE_SPARSE_MAP;
	}
}