/**
* Perform the action of the plugin.
*
* @param document the current document.
*/
public boolean perform(Document document) throws IOException {
// Interact with the user to get the layer tag/
Tag layerTag = getLayerTagFromUser(document);
if (layerTag == null) return false; // User cancled.
Tag endTag = new Tag(layerTag.getName(), false);
// Get the output stream to hold 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));
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()) {
out.print(layerTag);
} else if (comment.isSelectionEnd()) {
out.print(comment);
out.print(endTag);
continue; // So comment isn't printed twice.
}
}
out.print(token);
}
out.close();
return true;
}
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();
}
}
}
/**
* 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();
}
}
