content: // ===============================================================================
  // Authors: AFRL/RQQD
  // Organization: Air Force Research Laboratory, Aerospace Systems Directorate, Power and Control Division
  // 
  // Copyright (c) 2017 Government of the United State of America, as represented by
  // the Secretary of the Air Force.  No copyright is claimed in the United States under
  // Title 17, U.S. Code.  All Other Rights Reserved.
  // ===============================================================================
  
  /*
   * GRAL: GRAphing Library for Java(R)
   *
   * (C) Copyright 2009-2013 Erich Seifert <dev[at]erichseifert.de>,
   * Michael Seifert <mseifert[at]error-reports.org>
   *
   * This file is part of GRAL.
   *
   * GRAL is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * GRAL 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 Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License
   * along with GRAL.  If not, see <http://www.gnu.org/licenses/>.
   */
  package de.erichseifert.gral.plots.legends;
  
  import java.util.LinkedList;
  import java.util.List;
  
  import de.erichseifert.gral.data.DataSource;
  import de.erichseifert.gral.data.Row;
  
  /**
   * A legend implementation that displays an item for each data series that are
   * added to the legend.
   */
  public abstract class SeriesLegend extends AbstractLegend {
  	/** Version id for serialization. */
  	private static final long serialVersionUID = 1092110896986707546L;
  
  	@Override
  	protected Iterable<Row> getEntries(DataSource source) {
  		List<Row> items = new LinkedList<Row>();
  		Row row = new Row(source, 0);
  		items.add(row);
  		return items;
  	}
  
  	@Override
  	protected String getLabel(Row row) {
  		return row.getSource().toString();
  	}
  }
  