/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2008 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.example.table;

/**
 * This data row can be wrapped around another data row (delegate)
 * in order to prevent writing access. This might be useful, for example,
 * for database access.
 * 
 * @author Ingo Mierswa
 * @version $Id: NonWritableDataRow.java,v 1.2 2008/07/13 16:39:42 ingomierswa Exp $
 */
public class NonWritableDataRow extends DataRow {

	private static final long serialVersionUID = 6148646678312194050L;
	
	private DataRow delegate;
	
	public NonWritableDataRow(DataRow delegate) {
		this.delegate = delegate;
	}
	
	protected void ensureNumberOfColumns(int numberOfColumns) {
		this.delegate.ensureNumberOfColumns(numberOfColumns);
	}

	protected double get(int index, double defaultValue) {
		return delegate.get(index, defaultValue);
	}

	protected void set(int index, double value, double defaultValue) {
		throw new UnsupportedOperationException("The 'set' operation (writing data) is not supported for this type of underlying example tables, e.g. it is not supported for a data table backed up by a database. Please transform into a memory based data table first, for example with the batch processing operator, or materialize the data table in memory.");		
	}

	public String toString() {
		return delegate.toString();
	}

	public void trim() {
		delegate.trim();
	}
}