diva.gui.tutorial

Class TextDocument

java.lang.Object

diva.gui.AbstractDocument

diva.gui.tutorial.TextDocument

All Implemented Interfaces:

Document

public class TextDocument
extends AbstractDocument

A example document that contains plain boring old text and saves it to ascii files. Here you can see some sample implementations of the open, save, saveAs, and close methods. You should also notice that this class adds methods for accessing the contained document's data in an application-useful format. (In this case, there are just simple getText and setText methods.) The setText properly realized that the document's data has been changed and sets the Dirty flag. This is used in the application tutorial by the StoragePolicy to prevent a user from closing the document without saving changes.

This class also contains a DocumentFactory for documents of this type. The document factory is used by an application to create documents of this type.

Version:

$Revision: 1.3 $

Author:

Steve Neuendorffer (neuendor@eecs.berkeley.edu)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TextDocument.Factory TextDocument.Factory is a factory for Text Documents

Constructor Summary

Constructors

Constructor and Description
TextDocument(Application application) Create an text document for the given application containing an empty string.

Method Summary

Modifier and Type	Method and Description
void	close() Close the document.
String	getText() Return the text contained in this document.
void	open() Open the document from its current file or URL.
void	save() Save the document to its current file or URL.
void	saveAs(File file) Save the document to the given file.
void	saveAs(URL url) Save the document to the given URL.
void	setText(String text) Set the text contained by this document.

Methods inherited from class diva.gui.AbstractDocument

addPropertyChangeListener, getApplication, getEditSupport, getFile, getShortTitle, getTitle, getUndoManager, getURL, isDirty, isEditable, isWritable, removePropertyChangeListener, setDirty, setEditable, setFile, setURL, setWritable

Methods inherited from class java.lang.Object

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

Constructor Detail

TextDocument

public TextDocument(Application application)

Create an text document for the given application containing an empty string.

Method Detail

close

public void close()

Close the document. Do not attempt to save the document first or do any other user-interface things like that. This method can thrown an exception if there is a failure, but it should only do do if there is no way it can recover. Note that actions such as querying the user to save a modified document and so on are the responsibility of the application, not the Document implementation.

Specified by:

close in interface Document

Overrides:

close in class AbstractDocument

Throws:

Exception - If the close operation fails.

getText

public String getText()

Return the text contained in this document.

open

public void open()
          throws Exception

Open the document from its current file or URL. Throw an exception if the operation failed.

Specified by:

open in interface Document

Specified by:

open in class AbstractDocument

Throws:

Exception - If the close operation fails.

save

public void save()
          throws Exception

Save the document to its current file or URL. Throw an exception if the operation failed. Reasons for failure might include the fact that the file is not writable, or that the document has a URL but we haven't implemented HTTP-DAV support yet...

Specified by:

save in interface Document

Specified by:

save in class AbstractDocument

Throws:

Exception - If the save operation fails.

saveAs

public void saveAs(File file)
            throws Exception

Save the document to the given file. Throw an exception if the operation failed. Return true if successful, false if not. Do not change the file attribute to the new File object as that is the responsibility of the application, which it will do according to its storage policy.

Specified by:

saveAs in interface Document

Specified by:

saveAs in class AbstractDocument

Throws:

Exception - If the save-as operation fails.

See Also:

save()

saveAs

public void saveAs(URL url)
            throws Exception

Save the document to the given URL. Throw an exception if the operation failed. Do not change the URL attribute to the new URL object as that is the responsibility of the application, which it will do according to its storage policy.

Specified by:

saveAs in interface Document

Specified by:

saveAs in class AbstractDocument

Throws:

Exception - If the save-as operation fails.

See Also:

save()

setText

public void setText(String text)

Set the text contained by this document. If the given text is different from the previously contained text, then set the dirty flag.