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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jfreechart/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ------------ 28: * Dataset.java 29: * ------------ 30: * (C) Copyright 2000-2005, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * $Id: Dataset.java,v 1.3.2.1 2005/10/25 21:32:29 mungady Exp $ 36: * 37: * Changes (from 18-Sep-2001) 38: * -------------------------- 39: * 18-Sep-2001 : Added standard header and fixed DOS encoding problem (DG); 40: * 15-Oct-2001 : Moved to a new package (com.jrefinery.data.*) (DG); 41: * 22-Oct-2001 : Changed name to Dataset.java (DG); 42: * 17-Nov-2001 : Added getLegendItemCount() and getLegendItemLabels() methods, 43: * created SeriesDataset interface and transferred series related 44: * methods out (DG); 45: * 22-Jan-2002 : Reconsidered (and removed) the getLegendItemCount() and 46: * getLegendItemLabels() methods...leave this to client code (DG); 47: * 27-Sep-2002 : Added get/setDatasetGroup() methods (DG); 48: * 10-Jan-2003 : Updated Javadocs (DG); 49: * 50: */ 51: 52: package org.jfree.data.general; 53: 54: /** 55: * The base interface for data sets. 56: * <P> 57: * All datasets are required to support the {@link DatasetChangeEvent} 58: * mechanism by allowing listeners to register and receive notification of any 59: * changes to the dataset. 60: * <P> 61: * In addition, all datasets must belong to one (and only one) 62: * {@link DatasetGroup}. The group object maintains a reader-writer lock 63: * which provides synchronised access to the datasets in multi-threaded code. 64: */ 65: public interface Dataset { 66: 67: /** 68: * Registers an object for notification of changes to the dataset. 69: * 70: * @param listener the object to register. 71: */ 72: public void addChangeListener(DatasetChangeListener listener); 73: 74: /** 75: * Deregisters an object for notification of changes to the dataset. 76: * 77: * @param listener the object to deregister. 78: */ 79: public void removeChangeListener(DatasetChangeListener listener); 80: 81: /** 82: * Returns the dataset group. 83: * 84: * @return The dataset group. 85: */ 86: public DatasetGroup getGroup(); 87: 88: /** 89: * Sets the dataset group. 90: * 91: * @param group the dataset group. 92: */ 93: public void setGroup(DatasetGroup group); 94: 95: }