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Java Source | 1998-04-08 | 6.3 KB | 161 lines |
- /* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
- *
- * The contents of this file are subject to the Netscape Public License
- * Version 1.0 (the "NPL"); you may not use this file except in
- * compliance with the NPL. You may obtain a copy of the NPL at
- * http://www.mozilla.org/NPL/
- *
- * Software distributed under the NPL is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
- * for the specific language governing rights and limitations under the
- * NPL.
- *
- * The Initial Developer of this code under the NPL is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1998 Netscape Communications Corporation. All Rights
- * Reserved.
- */
-
- package netscape.test.plugin.composer;
-
- import java.io.*;
- import java.net.*;
- import netscape.plugin.composer.*;
- import netscape.plugin.composer.io.*;
-
- /** Sample Plugin that adds a "Netscape Now" button to the document.
- * Shows how to add images to the document.
- */
-
- public class AddButton extends Plugin {
- /** Test the plugin. Not required for normal operation of the plugin.
- * You can use this to run the plugin from the command line:
- * java -classpath <your-class-path> <your-plugin-name> args...
- * where args... are passed on to the Test class.
- * You can remove this code before shipping your plugin.
- */
- static public void main(String[] args) {
- Test.perform(args, new AddButton());
- }
- /** Get the human readable name of the plugin. Defaults to the name of the plugin class.
- * @return the human readable name of the plugin.
- */
- public String getName()
- {
- return "Netscape Button";
- }
-
- /** Get the human readable category of the plugin. Defaults to the name of the plugin class.
- * @return the human readable category of the plugin.
- */
- public String getCategory()
- {
- return "Insert";
- }
-
- /** Get the human readable hint for the plugin. This is a one-sentence description of
- * what the plugin does. Defaults to the name of the plugin class.
- * @return the human readable hint for the plugin.
- */
- public String getHint()
- {
- return "Inserts a 'Netscape Now' image that is linked to the Netscape home page.";
- }
-
- /** Perform the action of the plugin. This plugin adds a "Netscape Now" button
- * with a link to the Netscape home page.
- *
- * @param document the current document.
- */
- public boolean perform(Document document) throws IOException{
- // Create a print stream for the new document text.
- PrintWriter out = new PrintWriter(document.getOutput());
- // Create a lexical stream to tokenize the old document text.
- LexicalStream in = new LexicalStream(new SelectedHTMLReader(document.getInput(), out));
- // Keep track of whether or not we are in the selected text.
- // At the beginning of the document we're outside the selection.
- // After we encounter the start-selection comment, we're inside
- // the selection.
- // After we encounter the end-selection comment, we're outside
- // the selection again.
- boolean inSelection = false;
- Comment selectionStart = null;
- for(;;){
- // Get the next token of the document.
- Token token = in.next();
- if ( token == null ) break; // Null means we've finished the document.
- else if (token instanceof Comment ) {
- Comment comment = (Comment) token;
- if ( comment.isSelectionStart() ){
- selectionStart = comment;
- inSelection = true;
- continue; // Don't print the selection start yet.
- }
- else if (comment.isSelectionEnd() ){
- inSelection = false;
- out.print(selectionStart);
- insertButton(document, out);
- }
- else { // don't output this generic comment.
- continue;
- }
- }
- out.print(token);
- }
- out.close();
- return true;
- }
-
- void insertButton(Document document, PrintWriter out){
- String fileName = "netnow3.gif";
- String imgURLString = "http://home.netscape.com/comprod/products/navigator/version_3.0/images/"
- + fileName;
-
- writeImageToDisk(document, imgURLString, fileName);
-
- try {
- // Write the HTML for the button
- Tag anchor = new Tag("A");
- anchor.addAttribute("HREF", "http://www.netscape.com");
- Tag anchorEnd = new Tag("A", false);
- Tag img = new Tag("IMG");
- URL imgURL = new URL(document.getWorkDirectoryURL(), fileName);
- img.addAttribute("SRC", imgURL.toString());
- out.print(anchor);
- out.print(img);
- out.print(anchorEnd);
- } catch (Throwable t){
- t.printStackTrace();
- }
- }
-
- void writeImageToDisk(Document document, String imgURLString, String fileName){
- // We could just reference the image on the netscape site,
- // but the point of this example is to show how to write
- // a file to the disk.
-
- // In order to do this, we need to have the ability access files.
- netscape.security.PrivilegeManager.enablePrivilege("UniversalFileAccess");
- // And the ability to connect to an arbitrary URL.
- netscape.security.PrivilegeManager.enablePrivilege("UniversalConnect");
-
- // Copy the image to the work directory.
- File outFile = new File(document.getWorkDirectory(), fileName);
- if ( ! outFile.exists() ){
- try {
- InputStream in = new URL(imgURLString).openStream();
- FileOutputStream outStream = new FileOutputStream(outFile);
- int chunkSize = 1024;
- byte[] bytes = new byte[chunkSize];
- int readSize;
- while ( (readSize = in.read(bytes)) >= 0 ){
- outStream.write(bytes, 0, readSize);
- }
- outStream.close();
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- }
- }
-