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195 lines
6.9 KiB
195 lines
6.9 KiB
/*
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* Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.applet;
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import java.awt.Image;
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import java.awt.Graphics;
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import java.awt.image.ColorModel;
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import java.net.URL;
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import java.util.Enumeration;
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import java.io.InputStream;
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import java.io.IOException;
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import java.util.Iterator;
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/**
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* This interface corresponds to an applet's environment: the
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* document containing the applet and the other applets in the same
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* document.
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* <p>
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* The methods in this interface can be used by an applet to obtain
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* information about its environment.
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*
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* @author Arthur van Hoff
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* @since JDK1.0
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*/
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public interface AppletContext {
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/**
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* Creates an audio clip.
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*
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* @param url an absolute URL giving the location of the audio clip.
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* @return the audio clip at the specified URL.
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*/
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AudioClip getAudioClip(URL url);
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/**
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* Returns an <code>Image</code> object that can then be painted on
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* the screen. The <code>url</code> argument that is
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* passed as an argument must specify an absolute URL.
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* <p>
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* This method always returns immediately, whether or not the image
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* exists. When the applet attempts to draw the image on the screen,
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* the data will be loaded. The graphics primitives that draw the
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* image will incrementally paint on the screen.
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*
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* @param url an absolute URL giving the location of the image.
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* @return the image at the specified URL.
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* @see java.awt.Image
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*/
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Image getImage(URL url);
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/**
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* Finds and returns the applet in the document represented by this
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* applet context with the given name. The name can be set in the
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* HTML tag by setting the <code>name</code> attribute.
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*
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* @param name an applet name.
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* @return the applet with the given name, or <code>null</code> if
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* not found.
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*/
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Applet getApplet(String name);
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/**
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* Finds all the applets in the document represented by this applet
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* context.
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*
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* @return an enumeration of all applets in the document represented by
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* this applet context.
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*/
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Enumeration<Applet> getApplets();
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/**
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* Requests that the browser or applet viewer show the Web page
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* indicated by the <code>url</code> argument. The browser or
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* applet viewer determines which window or frame to display the
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* Web page. This method may be ignored by applet contexts that
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* are not browsers.
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*
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* @param url an absolute URL giving the location of the document.
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*/
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void showDocument(URL url);
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/**
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* Requests that the browser or applet viewer show the Web page
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* indicated by the <code>url</code> argument. The
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* <code>target</code> argument indicates in which HTML frame the
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* document is to be displayed.
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* The target argument is interpreted as follows:
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*
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* <center><table border="3" summary="Target arguments and their descriptions">
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* <tr><th>Target Argument</th><th>Description</th></tr>
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* <tr><td><code>"_self"</code> <td>Show in the window and frame that
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* contain the applet.</tr>
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* <tr><td><code>"_parent"</code><td>Show in the applet's parent frame. If
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* the applet's frame has no parent frame,
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* acts the same as "_self".</tr>
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* <tr><td><code>"_top"</code> <td>Show in the top-level frame of the applet's
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* window. If the applet's frame is the
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* top-level frame, acts the same as "_self".</tr>
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* <tr><td><code>"_blank"</code> <td>Show in a new, unnamed
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* top-level window.</tr>
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* <tr><td><i>name</i><td>Show in the frame or window named <i>name</i>. If
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* a target named <i>name</i> does not already exist, a
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* new top-level window with the specified name is created,
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* and the document is shown there.</tr>
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* </table> </center>
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* <p>
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* An applet viewer or browser is free to ignore <code>showDocument</code>.
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*
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* @param url an absolute URL giving the location of the document.
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* @param target a <code>String</code> indicating where to display
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* the page.
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*/
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public void showDocument(URL url, String target);
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/**
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* Requests that the argument string be displayed in the
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* "status window". Many browsers and applet viewers
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* provide such a window, where the application can inform users of
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* its current state.
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*
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* @param status a string to display in the status window.
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*/
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void showStatus(String status);
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/**
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* Associates the specified stream with the specified key in this
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* applet context. If the applet context previously contained a mapping
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* for this key, the old value is replaced.
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* <p>
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* For security reasons, mapping of streams and keys exists for each
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* codebase. In other words, applet from one codebase cannot access
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* the streams created by an applet from a different codebase
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* <p>
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* @param key key with which the specified value is to be associated.
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* @param stream stream to be associated with the specified key. If this
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* parameter is <code>null</code>, the specified key is removed
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* in this applet context.
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* @throws IOException if the stream size exceeds a certain
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* size limit. Size limit is decided by the implementor of this
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* interface.
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* @since 1.4
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*/
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public void setStream(String key, InputStream stream)throws IOException;
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/**
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* Returns the stream to which specified key is associated within this
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* applet context. Returns <tt>null</tt> if the applet context contains
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* no stream for this key.
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* <p>
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* For security reasons, mapping of streams and keys exists for each
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* codebase. In other words, applet from one codebase cannot access
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* the streams created by an applet from a different codebase
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* <p>
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* @return the stream to which this applet context maps the key
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* @param key key whose associated stream is to be returned.
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* @since 1.4
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*/
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public InputStream getStream(String key);
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/**
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* Finds all the keys of the streams in this applet context.
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* <p>
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* For security reasons, mapping of streams and keys exists for each
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* codebase. In other words, applet from one codebase cannot access
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* the streams created by an applet from a different codebase
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* <p>
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* @return an Iterator of all the names of the streams in this applet
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* context.
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* @since 1.4
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*/
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public Iterator<String> getStreamKeys();
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}
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