gridswing.java

一个用java写的开源的数据库系统

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 * list of conditions and the following disclaimer, including earlier
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 * this list of conditions and the following disclaimer in the documentation
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package org.hsqldb.util;

import java.util.Vector;
import javax.swing.table.*;

// sqlbob@users 20020401 - patch 1.7.0 by sqlbob (RMP) - enhancements

/** Simple table model to represent a grid of tuples.
 *
 * @version 1.7.0
 */
class GridSwing extends AbstractTableModel {

    String[] headers;
    Vector   rows;

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

        super();

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

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

    /**
     * Get the current table data.
     *  Each row is represented as a <code>String[]</code>
     *  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) {
        return ((String[]) rows.elementAt(row))[col];
    }

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

        headers = new String[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(String[] r) {

        String[] row = new String[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();
    }
}