Mega Code Archive
Query the installed version of the JMF
<![CDATA[
/*******************************************************************************
* GUIManagerQuery - A Graphical User Interface built atop the ManagerQuery
* class allowing the user to query the installed version of the JMF as to its
* support in termsof different players, processors, and protocols.
*
* @author Spike Barlow
******************************************************************************/
import java.awt.*;
import java.awt.event.*;
import javax.media.*;
import java.util.*;
public class GUIManagerQuery extends Frame implements ActionListener {
/** The version of the JMF. */
protected Label versionLabel;
/** Button to print JMF's hints. */
protected Button hintsButton;
/** Button to print list of players. */
protected Button playersButton;
/** Button to print list of processors. */
protected Button processorsButton;
/** Button to print list of data sources. */
protected Button sourcesButton;
/** TextField in which user can enter protocols or content types. */
protected TextField contentsField;
/** Area in which the results are displayed. */
protected TextArea results;
/***************************************************************************
* Construct the GUIManagerQuery object, constructing the various components
* and laying them out on the screen.
**************************************************************************/
public GUIManagerQuery() {
super("GUIManagerQuery");
setLayout(new BorderLayout());
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
versionLabel = new Label("JMF v" + Manager.getVersion());
add(versionLabel, "North");
Panel lower = new Panel();
lower.add(new Label("Content/Protocol"));
contentsField = new TextField(32);
lower.add(contentsField);
add(lower, "South");
results = new TextArea(20, 80);
results.setEditable(false);
add(results, "Center");
Panel controls = new Panel();
controls.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
hintsButton = new Button("Hints");
gbc.gridx = 0;
gbc.gridy = 0;
controls.add(hintsButton, gbc);
hintsButton.addActionListener(this);
playersButton = new Button("Players");
gbc.gridy = 1;
controls.add(playersButton, gbc);
playersButton.addActionListener(this);
processorsButton = new Button("Processors");
gbc.gridy = 2;
controls.add(processorsButton, gbc);
processorsButton.addActionListener(this);
sourcesButton = new Button("DataSources");
gbc.gridy = 3;
controls.add(sourcesButton, gbc);
sourcesButton.addActionListener(this);
add(controls, "East");
}
/***************************************************************************
* Respond to button presses from the user indicating the desire for
* information such as a list of players.
**************************************************************************/
public void actionPerformed(ActionEvent e) {
int type;
String[] cons;
////////////////////////////////////////////////////////////////
// Handle hints - simplest case [no need to check content types]
////////////////////////////////////////////////////////////////
if (e.getSource() == hintsButton) {
results.setText(ManagerQuery.getHints());
}
/////////////////////////////////////////////////////////////////////
// Players, processors, or datasources. Need to check the contents
// field and if it has text in there then use that as a qualifier
// in the search for classes. However if empty then generate a
// complete list of all classes of the required type. User may
// enter multiple content types either comma or space separated,
// hence use of StringTokenizer.
////////////////////////////////////////////////////////////////////
else {
if (e.getSource() == playersButton)
type = ManagerQuery.HANDLERS;
else if (e.getSource() == processorsButton)
type = ManagerQuery.PROCESSORS;
else
type = ManagerQuery.DATASOURCES;
String contents = contentsField.getText();
if (contents == null || contents.length() == 0)
cons = null;
else {
StringTokenizer tokenizer = new StringTokenizer(contents,
" ,\t;");
cons = new String[tokenizer.countTokens()];
for (int i = 0; i < cons.length; i++)
cons[i] = tokenizer.nextToken();
}
if (cons != null && cons.length > 0)
results.setText(ManagerQuery
.getHandlersOrProcessors(cons, type));
else if (type == ManagerQuery.HANDLERS)
results.setText(ManagerQuery.getHandlers());
else if (type == ManagerQuery.PROCESSORS)
results.setText(ManagerQuery.getProcessors());
else
results.setText(ManagerQuery.getDataSources());
}
}
/***************************************************************************
* Main method - construct a GUIManagerQuery frame and show it on the
* screen.
**************************************************************************/
public static void main(String[] args) {
GUIManagerQuery gui = new GUIManagerQuery();
gui.pack();
gui.setSize(640, 600);
gui.show();
}
}
]]>