HSQLDB example source code file (GridSwing.java)

This example HSQLDB source code file (GridSwing.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - HSQLDB tags/keywords

abstracttablemodel, awt, component, event, gridswing, gridswing, gui, jtable, jtable, object, object, string, swing, table, tablecellrenderer, tablecellrenderer, tablecolumn, tablemodel, vector, vector

The HSQLDB GridSwing.java source code

/*
 * For work developed by the HSQL Development Group:
 *
 * Copyright (c) 2001-2010, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 *
 * For work originally developed by the Hypersonic SQL Group:
 *
 * Copyright (c) 1995-2000, The Hypersonic SQL Group.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Hypersonic SQL Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Hypersonic SQL Group.
 */


package org.hsqldb.util;

import java.util.Vector;
import java.awt.Component;

import javax.swing.JTable;
import javax.swing.event.TableModelEvent;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableModel;

// sqlbob@users 20020401 - patch 1.7.0 by sqlbob (RMP) - enhancements
// deccles@users 20040412 - patch 933671 - various bug fixes

/** Simple table model to represent a grid of tuples.
 *
 * New class based on Hypersonic SQL original
 *
 * @author dmarshall@users
 * @version 1.7.2
 * @since 1.7.0
 */
class GridSwing extends AbstractTableModel {

    JTable   jtable = null;
    Object[] headers;
    Vector   rows;

    /**
     * Default constructor.
     */
    public GridSwing() {

        super();

        headers = new Object[0];    // initially empty
        rows    = new Vector();     // initially empty
    }

    /**
     * Get the name for the specified column.
     */
    public String getColumnName(int i) {
        return headers[i].toString();
    }

    public Class getColumnClass(int i) {

        if (rows.size() > 0) {
            Object o = getValueAt(0, i);

            if (o != null) {
                if ((o instanceof java.sql.Timestamp)
                    || (o instanceof java.sql.Time)) {
                    // This is a workaround for JTable's lack of a default
                    // renderer that displays times.
                    // Without this workaround, Timestamps (and similar
                    // classes) will be displayed as dates without times,
                    // since JTable will match these classes to their
                    // java.util.Date superclass.
                    return Object.class;  // renderer will draw .toString().
                }
                return o.getClass();
            }
        }

        return super.getColumnClass(i);
    }

    /**
     * Get the number of columns.
     */
    public int getColumnCount() {
        return headers.length;
    }

    /**
     * Get the number of rows currently in the table.
     */
    public int getRowCount() {
        return rows.size();
    }

    /**
     * Get the current column headings.
     */
    public Object[] getHead() {
        return headers;
    }

    /**
     * Get the current table data.
     *  Each row is represented as a <code>String[]
     *  with a single non-null value in the 0-relative
     *  column position.
     *  <p>The first row is at offset 0, the nth row at offset n etc.
     */
    public Vector getData() {
        return rows;
    }

    /**
     * Get the object at the specified cell location.
     */
    public Object getValueAt(int row, int col) {

        if (row >= rows.size()) {
            return null;
        }

        Object[] colArray = (Object[]) rows.elementAt(row);

        if (col >= colArray.length) {
            return null;
        }

        return colArray[col];
    }

    /**
     * Set the name of the column headings.
     */
    public void setHead(Object[] h) {

        headers = new Object[h.length];

        // System.arraycopy(h, 0, headers, 0, h.length);
        for (int i = 0; i < h.length; i++) {
            headers[i] = h[i];
        }
    }

    /**
     * Append a tuple to the end of the table.
     */
    public void addRow(Object[] r) {

        Object[] row = new Object[r.length];

        // System.arraycopy(r, 0, row, 0, r.length);
        for (int i = 0; i < r.length; i++) {
            row[i] = r[i];

            if (row[i] == null) {

//                row[i] = "(null)";
            }
        }

        rows.addElement(row);
    }

    /**
     * Remove data from all cells in the table (without
     *  affecting the current headings).
     */
    public void clear() {
        rows.removeAllElements();
    }

    public void setJTable(JTable table) {
        jtable = table;
    }

    public void fireTableChanged(TableModelEvent e) {
        super.fireTableChanged(e);
        autoSizeTableColumns(jtable);
    }

    public static void autoSizeTableColumns(JTable table) {

        TableModel  model        = table.getModel();
        TableColumn column       = null;
        Component   comp         = null;
        int         headerWidth  = 0;
        int         maxCellWidth = Integer.MIN_VALUE;
        int         cellWidth    = 0;
        TableCellRenderer headerRenderer =
            table.getTableHeader().getDefaultRenderer();

        for (int i = 0; i < table.getColumnCount(); i++) {
            column = table.getColumnModel().getColumn(i);
            comp = headerRenderer.getTableCellRendererComponent(table,
                    column.getHeaderValue(), false, false, 0, 0);
            headerWidth  = comp.getPreferredSize().width + 10;
            maxCellWidth = Integer.MIN_VALUE;

            for (int j = 0; j < Math.min(model.getRowCount(), 30); j++) {
                TableCellRenderer r = table.getCellRenderer(j, i);

                comp = r.getTableCellRendererComponent(table,
                                                       model.getValueAt(j, i),
                                                       false, false, j, i);
                cellWidth = comp.getPreferredSize().width;

                if (cellWidth >= maxCellWidth) {
                    maxCellWidth = cellWidth;
                }
            }

            column.setPreferredWidth(Math.max(headerWidth, maxCellWidth)
                                     + 10);
        }
    }
}