AppletContext
| java.applet.AppletContext |
 Known Indirect Subclasses
|
Class Overview
This interface corresponds to an applet's environment: the document containing the applet and the other applets in the same document.
The methods in this interface can be used by an applet to obtain information about its environment.
Summary
| Public Methods | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Finds and returns the applet in the document represented by this
applet context with the given name.
| |||||||||||
Finds all the applets in the document represented by this applet
context.
| |||||||||||
Creates an audio clip.
| |||||||||||
Returns an
Image object that can then be painted on
the screen. | |||||||||||
Returns the stream to which specified key is associated within this
applet context.
| |||||||||||
Finds all the keys of the streams in this applet context.
| |||||||||||
Associates the specified stream with the specified key in this
applet context.
| |||||||||||
Requests that the browser or applet viewer show the Web page
indicated by the
url argument. | |||||||||||
Requests that the browser or applet viewer show the Web page
indicated by the
url argument. | |||||||||||
Requests that the argument string be displayed in the
"status window".
| |||||||||||
Public Methods
public abstract Applet getApplet (String name)
Finds and returns the applet in the document represented by this
applet context with the given name. The name can be set in the
HTML tag by setting the name attribute.
Parameters
| name | an applet name. |
|---|
Returns
- the applet with the given name, or
nullif not found.
public abstract Enumeration<Applet> getApplets ()
Finds all the applets in the document represented by this applet context.
Returns
- an enumeration of all applets in the document represented by this applet context.
public abstract AudioClip getAudioClip (URL url)
Creates an audio clip.
Parameters
| url | an absolute URL giving the location of the audio clip. |
|---|
Returns
- the audio clip at the specified URL.
public abstract Image getImage (URL url)
Returns an Image object that can then be painted on
the screen. The url argument that is
passed as an argument must specify an absolute URL.
This method always returns immediately, whether or not the image exists. When the applet attempts to draw the image on the screen, the data will be loaded. The graphics primitives that draw the image will incrementally paint on the screen.
Parameters
| url | an absolute URL giving the location of the image. |
|---|
Returns
- the image at the specified URL.
See Also
public abstract InputStream getStream (String key)
Returns the stream to which specified key is associated within this applet context. Returns null if the applet context contains no stream for this key.
For security reasons, mapping of streams and keys exists for each codebase. In other words, applet from one codebase cannot access the streams created by an applet from a different codebase
Parameters
| key | key whose associated stream is to be returned. |
|---|
Returns
- the stream to which this applet context maps the key
public abstract Iterator<String> getStreamKeys ()
Finds all the keys of the streams in this applet context.
For security reasons, mapping of streams and keys exists for each codebase. In other words, applet from one codebase cannot access the streams created by an applet from a different codebase
Returns
- an Iterator of all the names of the streams in this applet context.
public abstract void setStream (String key, InputStream stream)
Associates the specified stream with the specified key in this applet context. If the applet context previously contained a mapping for this key, the old value is replaced.
For security reasons, mapping of streams and keys exists for each codebase. In other words, applet from one codebase cannot access the streams created by an applet from a different codebase
Parameters
| key | key with which the specified value is to be associated. |
|---|---|
| stream | stream to be associated with the specified key. If this
parameter is null, the specified key is removed
in this applet context. |
Throws
| if the stream size exceeds a certain size limit. Size limit is decided by the implementor of this interface. | |
| IOException |
public abstract void showDocument (URL url)
Requests that the browser or applet viewer show the Web page
indicated by the url argument. The browser or
applet viewer determines which window or frame to display the
Web page. This method may be ignored by applet contexts that
are not browsers.
Parameters
| url | an absolute URL giving the location of the document. |
|---|
public abstract void showDocument (URL url, String target)
Requests that the browser or applet viewer show the Web page
indicated by the url argument. The
target argument indicates in which HTML frame the
document is to be displayed.
The target argument is interpreted as follows:
| Target Argument | Description |
|---|---|
"_self" | Show in the window and frame that contain the applet. |
"_parent" | Show in the applet's parent frame. If the applet's frame has no parent frame, acts the same as "_self". |
"_top" | Show in the top-level frame of the applet's window. If the applet's frame is the top-level frame, acts the same as "_self". |
"_blank" | Show in a new, unnamed top-level window. |
| name | Show in the frame or window named name. If a target named name does not already exist, a new top-level window with the specified name is created, and the document is shown there. |
An applet viewer or browser is free to ignore showDocument.
Parameters
| url | an absolute URL giving the location of the document. |
|---|---|
| target | a String indicating where to display
the page.
|
public abstract void showStatus (String status)
Requests that the argument string be displayed in the "status window". Many browsers and applet viewers provide such a window, where the application can inform users of its current state.
Parameters
| status | a string to display in the status window. |
|---|