array of beans in a bean

From:

thufir <hawat.thufir@gmail.com>

Newsgroups:

comp.lang.java.help

Date:

Thu, 24 Jul 2008 01:15:17 GMT

Message-ID:

<FIQhk.129155$gc5.14270@pd7urf2no>

I'm working on JDBC and GUI's. For the GUI I'd like to have a source
bean, DatabaseField, of which the target bean, SingleRecord, is
composed. Specifically, a collection of DatabaseField beans inside the
SingleRecord bean. The field names, and the quantity of fields, would be
discovered on run-time with meta-data.

Is this a reasonable approach?

some code, just to give an outline (with comments):

thufir@arrakis:~/bcit3621$
thufir@arrakis:~/bcit3621$ cat lab5/src/a00720398/lab05/beans/
DatabaseField.java

package a00720398.lab05.beans;

public class DatabaseField extends javax.swing.JPanel {

    /** Creates new form DatabaseField */
    public DatabaseField() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-
BEGIN:initComponents
    private void initComponents() {

        field = new javax.swing.JLabel();
        data = new javax.swing.JTextField();

        field.setText("field");
        add(field);

        data.setText("data");
        add(data);
    }// </editor-fold>//GEN-END:initComponents


    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JTextField data;
    private javax.swing.JLabel field;
    // End of variables declaration//GEN-END:variables

}
thufir@arrakis:~/bcit3621$
thufir@arrakis:~/bcit3621$ cat lab5/src/a00720398/lab05/beans/
SingleRecord.java

package a00720398.lab05.beans;

import java.util.*;

public class SingleRecord extends javax.swing.JPanel {

    /** Creates new form SingleRecord */
    public SingleRecord() {
        List<DatabaseField> fields = new ArrayList<DatabaseField>();
        /*make an unknown quantity of DatabaseField beans and
         * add each bean to the list -- simple.
         * Next, bind each bean to a field in the database.
         * Getting the meta data is easy, but the mechanics
         * of binding each DatabaseField bean to its corresponding
         * database field seems murky.
         *
         * is this a scenario which calls for single table inheritance?
         *
         * the db is quite simple. Does there need to be an object
         * which represents one row of the table? Can its attributes
         * be dynamically determined? This would require reflection?
         */
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-
BEGIN:initComponents
    private void initComponents() {

        databaseField1 = new a00720398.lab05.beans.DatabaseField();

        setLayout(new javax.swing.BoxLayout(this,
javax.swing.BoxLayout.Y_AXIS));
        add(databaseField1);
    }// </editor-fold>//GEN-END:initComponents


    // Variables declaration - do not modify//GEN-BEGIN:variables
    private a00720398.lab05.beans.DatabaseField databaseField1;
    // End of variables declaration//GEN-END:variables

}
thufir@arrakis:~/bcit3621$
thufir@arrakis:~/bcit3621$

thanks,

Thufir