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"available, number " + index + " requested: " + e ); } Debugprintln( 9, "DirNodegetChildAt: found <" + ((DirNode)node)getDN() + ">" ); return node; }
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LDAPConnection ldc = DirUtilgetLDAPConnection( "mantamcomcom", 389, "cn=directory manager", "password" ); TreePanel tree = new TreePanel( new DirModel( ldc ) );
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Figure 10-13 shows TreePanel in the mode in which only container entries are displayed TreePanel is displayed in the application TestTree, which allows selection of various options from the command line: Display leaf nodes or only container nodes Show private suf xes or only public suf xes
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FIGURE 10-13 TreePanel with only containers
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330 Don t Redo It, Reuse It: LDAP JavaBeans
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Follow referrals or not Show only the tree or the tree together with a table of child entries If we want to display all nodes, including leaf nodes, then instantiation and initialization have to be done separately:
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LDAPConnection ldc = DirUtilgetLDAPConnection( "mantamcomcom", 389, "cn=directory manager", "password" ); DirModel model = new DirModel( ldc ); modelsetAllowsLeafNodes( true ); modelinitialize( null ); TreePanel tree = new TreePanel( model );
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In Figure 10-14, both container entries and leaf entries are displayed To compile the code examples, you will need to have the bin directory of your Java 2 installation in your PATH, and the LDAP JAR le ldapjdkjar, as well as the
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FIGURE 10-14 TreePanel with all nodes
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current working directory, in your CLASSPATH, as described in 3 You can compile the examples in the source code directory for 10 using the following command:
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You can run TreePanel as an application using the command
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java TreePanel localhost 389 "cn=directory manager" password
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Substitute the host name of the machine where the directory is installed (if it is not on the same machine where you are running the application), the port number of the directory, a valid distinguished name, and a password for that DN You can use any valid DN and password, including anonymous, but a nonprivileged user will not be able to see any of the private suf xes The command looks like this for anonymous access:
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java TreePanel localhost 389 "" ""
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Figure 10-15 illustrates TreePanel with only public suf xes displayed (because it is executed as a nonprivileged user)
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FIGURE 10-15 Tree viewed by anonymous user
332 Don t Redo It, Reuse It: LDAP JavaBeans
A Directory Lister
Displaying all the nodes of the directory in a tree has some disadvantages: It is hard to nd a particular entry if a particular node contains many entries You may end up with a large number of entries in memory when the user expands a node with many children If you want to display attributes of entries, and not just the DNs or names, you can display only one at a time It is common to display only container nodes in a tree, and then show children of a selected node in a list or table The list or table may display several attributes of each child The next JavaBean (SimpleTable) is a table with sorting, and an adapter to hook up the TreePanel Bean with the table Bean SimpleTable (Figure 10-16) is a JPanel containing a simple extension of JTable It adds support for sorting by clicking on the column headers, and for easily changing the headers and data dynamically It is not LDAP-aware; that s the purpose of the adapter It is also not suitable for very large numbers of entries In 16 we will discuss the use of Virtual List View to handle the display of large databases
SimpleTable
SimpleTable() addRow(v : Vector) : void removeAllRows() : void SetColumnNames(names : String[]) : void SetHeaderRenderer(renderer : TableCellRenderer) : void SetColumnWidths(ColumnWidth : int[]) : void fireTableDataChanged() : void fireTableStructureChanged() : void
FIGURE 10-16 SimpleTable
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SimpleTable offers the following methods of interest, dispatching to the table:
/** * Add a row to the table model without triggering an event to notify * the table to update itself After finishing adding all rows, * fireTableDataChanged should be called to notify the table * * @param v a row to add */ public void addRow( Vector v ) { _tableModelgetDataVector()addElement( v ); } /** * Remove all rows from the model and notify the table */ public void removeAllRows() { Vector v = _tableModelgetDataVector(); vremoveAllElements(); _tableModelfireTableDataChanged(); } /** * Set the column header labels and attach the sorting header * renderer * * @param names array of one label for each column */ public void setColumnNames( String[] names ) { _tableModelsetColumnIdentifiers( names ); setHeaderRenderer( _renderer ); } /** * Attach the sorting header renderer to each column */ public void setHeaderRenderer( TableCellRenderer renderer ) { TableColumnModel model = _tablegetColumnModel(); for ( int i = modelgetColumnCount() - 1; i >= 0; i ) { modelgetColumn(i)setHeaderRenderer( renderer ); } } /** * Set the column widths of the table