xydatasettablemodel.java

Web图形化的Java库

/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * ------------------------
 * XYDatasetTableModel.java
 * ------------------------
 * (C)opyright 2003, by Bryan Scott and Contributors.
 *
 * Original Author:  Bryan Scott ;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 01-Jul-2003 : Version 1 contributed by Bryan Scott (DG);
 */

package org.jfree.data;

import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;

/**
 * A READ-ONLY wrapper around an {@link XYDataset} to convert it to a
 * table model for use in a JTable.
 * <P>
 * TO DO:
 * <ul><li>implement proper naming for x axis (getColumnName)</li>
 * <li>implement setValueAt to remove READ-ONLY constraint (not sure how)</li></ul>
 *
 * @author           Bryan Scott
 */

public class XYDatasetTableModel extends AbstractTableModel
                                 implements TableModel, DatasetChangeListener  {

    /** The dataset. */
    XYDataset model = null ;

    /**
     * Default constructor.
     */
    public XYDatasetTableModel() {
        super();
    }

    /**
     * Creates a new table model based on the specified dataset.
     * 
     * @param dataset  the dataset.
     */
    public XYDatasetTableModel(XYDataset dataset) {
        this();
        setModel(dataset);
    }

    /**
     * Sets the model (dataset).
     * 
     * @param dataset  the dataset.
     */
    public void setModel(XYDataset dataset) {
        this.model = dataset;
        this.model.addChangeListener(this);
        fireTableDataChanged();
    }

    /**
     * Returns the number of rows.
     * 
     * @return The row count.
     */
    public int getRowCount() {
        if (this.model == null) {
            return 0;
        }
        return this.model.getItemCount(0);
    }

    /**
     * Gets the number of columns in the model.
     * 
     * @return The number of columns in the model.
     */
    public int getColumnCount() {
        if (this.model == null) {
            return 0;
        }
        return this.model.getSeriesCount() + 1;
    }

    /**
     * Returns the column name.
     * 
     * @param column  the column index.
     * 
     * @return The column name.
     */
    public String getColumnName(int column) {
        if (this.model == null) {
            return super.getColumnName(column);
        }
        if (column < 1) {
            return "X Value";
        } 
        else {
            return this.model.getSeriesName(column - 1);
        }
    }

    /**
     * Returns a value of the specified cell.
     * Column 0 is the X axis, Columns 1 and over are the Y axis
     *
     * @param row  the row number.
     * @param column  the column number.
     *
     * @return the value of the specified cell.
     */
    public Object getValueAt(int row, int column) {
        if (this.model == null) {
            return null;
        }
        if (column < 1) {
            return this.model.getXValue(0, row);
        }
        else {
            return model.getYValue(row, column - 1);
        }
    }

    /**
     * Notify listeners that the underlying dataset has changed.
    *
     * @param datasetChangeEvent the event
     * 
     * @see DatasetChangeListener
     */
    public void datasetChanged(DatasetChangeEvent datasetChangeEvent) {
        fireTableDataChanged();
    }

    /**
     * Returns a flag indicating whether or not the specified cell is editable.
     *
     * @param row  the row number.
     * @param column  the column number.
     *
     * @return <code>true</code> if the specified cell is editable.
     */
    public boolean isCellEditable(int row, int column) {
        return false;
   }

    /**
     * Updates the {@link XYDataset} if allowed.
     *
     * @param value  the new value.
     * @param row  the row.
     * @param column  the column.
     */
    public void setValueAt(Object value, int row, int column) {
        if (this.isCellEditable(row, column)) {
            // XYDataset only provides methods for reading a dataset...
        }
    }

//    /**
//     * Run a demonstration of the table model interface.
//     * 
//     * @param args  ignored.
//     *
//     * @throws exception when an error occurs.
//     */
//    public static void main(String args[]) throws Exception {
//        JFrame frame = new JFrame();
//        JPanel panel = new JPanel();
//        JScrollPane scroll = new JScrollPane();
//        panel.setLayout(new BorderLayout());
//
//        XYDataset xyDataset = DemoDatasetFactory.createSampleXYDataset();
//        XYDatasetTableModel tablemodel = new XYDatasetTableModel();
//
//        tablemodel.setModel(xyDataset);
//
//        JTable dataTable = new JTable(tablemodel);
//        scroll.getViewport().add(dataTable, null);
//
//        JFreeChart chart = ChartFactory.createLineXYChart(
//            "XY Series Demo",
//            "X", "Y", xyDataset,
//            true,
//            true,
//            false
//        );
//
//        ChartPanel chartPanel = new ChartPanel(chart);
//
//        panel.add(chartPanel, BorderLayout.CENTER);
//        panel.add(scroll, BorderLayout.SOUTH);
//
//        frame.setContentPane(panel);
//        frame.setSize(300, 500);
//        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//        frame.show();
//        RefineryUtilities.centerFrameOnScreen(frame);
//    }

}