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1
22
23 package demo.notepad;
24
25 import java.awt.*;
26 import java.awt.event.*;
27 import java.io.*;
28 import java.net.*;
29 import javax.swing.*;
30 import apollo.*;
31 import houston.*;
32
33 public class AppFrame extends JFrame
34 {
35
36 private final static String  APP_TITLE = "Secure Notepad";
37 SecureFileChooser _chooser;
38 FileContents _contents;
39 JTextArea _editor;
40
41 public AppFrame()
42 {
43 super( APP_TITLE );
44
45 JButton newBt = new JButton( "New" );
46 JButton openBt = new JButton( "Open" );
47 JButton saveBt = new JButton( "Save" );
48 JButton saveAsBt = new JButton( "Save As" );
49 JButton copyBt = new JButton( "Copy" );
50 JButton pasteBt = new JButton( "Paste" );
51
52 newBt.addActionListener(
53 new ActionListener()
54 {
55 public void actionPerformed( ActionEvent ev )
56 {
57 onNew();
58 }
59 } );
60
61 openBt.addActionListener(
62 new ActionListener()
63 {
64 public void actionPerformed( ActionEvent ev )
65 {
66 onOpen();
67 }
68 } );
69
70 saveBt.addActionListener(
71 new ActionListener()
72 {
73 public void actionPerformed( ActionEvent ev )
74 {
75 onSave();
76 }
77 } );
78
79 saveAsBt.addActionListener(
80 new ActionListener()
81 {
82 public void actionPerformed( ActionEvent ev )
83 {
84 onSaveAs();
85 }
86 } );
87
88 copyBt.addActionListener(
89 new ActionListener()
90 {
91 public void actionPerformed( ActionEvent ev )
92 {
93 onCopy();
94 }
95 } );
96
97 pasteBt.addActionListener(
98 new ActionListener()
99 {
100 public void actionPerformed( ActionEvent ev )
101 {
102 onPaste();
103 }
104 } );
105
106 JPanel buttonPanel = new JPanel( new FlowLayout() );
107 buttonPanel.add( newBt );
108 buttonPanel.add( openBt );
109 buttonPanel.add( saveBt );
110 buttonPanel.add( saveAsBt );
111 buttonPanel.add( new JSeparator() );
112 buttonPanel.add( copyBt );
113 buttonPanel.add( pasteBt );
114
115 _chooser = new SecureFileChooser();
116
117 _editor = new JTextArea();
118 _editor.setBackground( Color.yellow );
119 _editor.setFont( new Font( "sansserif", Font.PLAIN, 22 ) );
120
121 getContentPane().add( buttonPanel, BorderLayout.NORTH );
122 getContentPane().add( new JScrollPane( _editor ), BorderLayout.CENTER );
123
124 setSize( 400, 400 );
125
126 onNew();
127
128 addWindowListener(
129 new WindowAdapter()
130 {
131 public void windowClosing( WindowEvent e )
132 {
133 onExit();
134 }
135 } );
136 }
137
138 public void onCopy()
139 {
140 String text = _editor.getSelectedText();
141 SecureClipboard.copyText( text );
142 }
143
144 public void onExit()
145 {
146 System.exit( 0 );
147 }
148
149 public void onNew()
150 {
151 _contents = null;
152 _editor.setText( "" );
153 updateTitle();
154 }
155
156 public void onOpen()
157 {
158 try
159 {
160 if( _chooser.showOpenDialog() == SecureFileChooser.CANCEL )
161 return;
162
163 _contents = _chooser.getFileContents();
164 _editor.setText( loadText( _contents ) );
165 updateTitle();
166 }
167 catch( IOException ioex )
168 {
169 Status.error( "*** failed to open document: " + ioex.toString() );
170 }
171 }
172
173 public void onPaste()
174 {
175 String text = SecureClipboard.pasteText();
176 if( !text.equals( "" ) )
177 _editor.replaceSelection( text );
178 }
179
180 public void onSave()
181 {
182 try
183 {
184 if( _contents == null )
185 {
186
188 InputStream in = new StringBufferInputStream( _editor.getText() );
189
190 if( _chooser.showSaveDialog( in ) == SecureFileChooser.CANCEL )
191 return;
192
193 _contents = _chooser.getFileContents();
194 updateTitle();
195 }
196 else
197 saveText( _contents, _editor.getText() );
198 }
199 catch( IOException ioex )
200 {
201 Status.error( "*** failed to save document: " + ioex.toString() );
202 }
203 }
204
205 public void onSaveAs()
206 {
207 if( _contents == null )
208 onSave();
209 else
210 {
211 try
212 {
213 if( _chooser.showSaveAsDialog( _contents ) == SecureFileChooser.CANCEL )
214 return;
215
216 _contents = _chooser.getFileContents();
217 updateTitle();
218 }
219 catch( IOException ioex )
220 {
221 Status.error( "*** failed to save document: " + ioex.toString() );
222 }
223 }
224 }
225
226 public void updateTitle()
227 {
228 if( _contents == null )
229 setTitle( "Untitled - " + APP_TITLE );
230 else
231 {
232 try
233 {
234 setTitle( _contents.getName() + " (" + _contents.getLength() + "/"
235 + _contents.getMaxLength() + ") - " + APP_TITLE );
236 }
237 catch( IOException ioex )
238 {
239 Status.error( "*** failed to retrieve document name: " + ioex.toString() );
240 }
241 }
242 }
243
244 private static String loadText( FileContents contents ) throws IOException
245 {
246 if( contents == null )
247 return "";
248
249 BufferedReader in = new BufferedReader(
250 new InputStreamReader( contents.getInputStream() ) );
251 StringBuffer buf = new StringBuffer ( ( int ) contents.getLength() );
252
253 String line;
254 while( ( line = in.readLine() ) != null )
255 buf.append( line + "\n" );
256
257 in.close();
258 return buf.toString();
259 }
260
261 private static void saveText( FileContents contents, String text ) throws IOException
262 {
263 int bytesRequired = text.length() * 2;
264 if( bytesRequired > contents.getMaxLength() )
265 contents.setMaxLength( bytesRequired );
266
267 BufferedWriter out = new BufferedWriter(
268 new OutputStreamWriter( contents.getOutputStream( true ) ) );
269
272 out.write( text );
273 out.close();
274 }
275 }
276 |
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