org.activemath.applets
Class ProxiedAppletLoader

java.lang.Object
  java.awt.Component
      java.awt.Container
          java.awt.Panel
              java.applet.Applet
                  org.activemath.applets.AppletLoader
                      org.activemath.applets.ProxiedAppletLoader

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible

public class ProxiedAppletLoader
extends AppletLoader

An extension of AppletLoader where the applet is actually constructed after a request to the server for an HTML page whose first <applet> element is parsed and used to define the applet class and parameters.

The interest of such an applet-loader relies in the ability to start a resource on the server to support the applet only when the applet is actually opened. Such objects, in ActiveMath, are called Proxy as defined by interface org.activemath.proxy.Proxy.

Parameters are:

• AppletClass the class that is planned to be loaded. This class is loaded from the start up.
• ReadyToStartMessageThe label of the button when it is ready to pop-up the frame. Defaults to "Press...".
• StartingMessage The label of the button while the applet is being loaded (defaults to "Starting...")
• ShowMessage The label of the button when the applet has already been displayed, offering, as action, to bring the window to-front or to re-open it (the applet being not destroyed until the appletLoader is being destroyed). Defaults to "Show".
• proxyRequestURL The url to send the request to obtain the applet-tag containing document.

This applet-loader will, on button press, load the document indicated by the proxyRequestURL parameter. It will then parse it and define the frame-name (the title attribute), the frame size (the width, and height attributes), and the class-name of the applet (the code attribute).
It is to be noted that the document being downloaded is supposed to be well-formed XML as an XML parser (namely the MinML parser) is used to read this content and that attribute names are supposed to be lower-case; XML Namespaces are ignored by this parser though. Finally, please note that the classpath defined by the archive and codebase attributes of the applet tag are ignored in the proxy document so that only the classpath specified in the applet-loader's applet tag define the classpath.

Here is an example of the applet-loader tag:

 <APPLET archive="ConsoleApplet.jar,AppletLoader.jar" code="org.activemath.applets.ProxiedAppletLoader" 
                width="100" height="100">
 <PARAM name="AppletClass"                                         value="HelloWorld">
 <PARAM name="StartingMessage"                     value="Loading...">
 <PARAM name="ReadyToStartMessage"         value="Start my applet">
 <PARAM name="ShowMessage"                                         value="Show">
 <PARAM name="proxyRequestURL"                             value="ProxiedOne.xml">
 Your browser does not support Java, so nothing is displayed.
 </APPLET>
        

Here is an example of the tag delivered by the proxy (or, in the case of the applet-loader provider above, here is what the file ProxiedOne.xml should look like:

        <APPLET code="HelloWorld" width="600" height="200"
        title="My little title">
        </APPLET>
        

todo:

• implement a display of an image (in the paint)
• with a progress bar ?

Polish the code.

Version:

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.activemath.applets.AppletLoader

AppletLoader.AppletLoaderAware

Nested classes/interfaces inherited from class java.applet.Applet

Applet.AccessibleApplet

Nested classes/interfaces inherited from class java.awt.Panel

Panel.AccessibleAWTPanel

Nested classes/interfaces inherited from class java.awt.Container

Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component

Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

ProxiedAppletLoader()

Method Summary

void	init() Builds the small user-interface of the in-page applet that makes this button and attaches actions.

Methods inherited from class org.activemath.applets.AppletLoader

appletShouldBeThrownAway, destroy

Methods inherited from class java.applet.Applet

getAccessibleContext, getAppletContext, getAppletInfo, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, getParameterInfo, isActive, newAudioClip, play, play, resize, resize, setStub, showStatus, start, stop

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getMousePosition, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paint, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, setLayout, transferFocusBackward, transferFocusDownCycle, update, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ProxiedAppletLoader

public ProxiedAppletLoader()

Method Detail

init

public void init()

Description copied from class: AppletLoader

Builds the small user-interface of the in-page applet that makes this button and attaches actions.

Overrides:

init in class AppletLoader