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} } catch ( LDAPException e ) { Systemerrprintln( "LDAPPreferencesinitializeSchema: " + e ); return false; } } return true; }
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When it is time to save the preferences, only preferences that are new or that have changed are written to the directory Note that the directory will reject any values for the Teex attributes if the entry does not include the object class teexPreferences The save method adds the teexPreferences object class if it is not already present:
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/** * Save any changed preferences * * @return true on success */ public boolean save() { try { Enumeration keys = getChanges()keys(); // Any changes to save if( !keyshasMoreElements() ) { return true; } LDAPConnection ldc = new LDAPConnection(); ldcconnect( _urlgetHost(), _urlgetPort() ); ldcauthenticate( _urlgetDN(), _password ); LDAPModificationSet mods = new LDAPModificationSet(); // Do we need to add the preferences object class if ( !_hasOc ) { modsadd( LDAPModificationADD, new LDAPAttribute( "objectclass", PREFERENCES_OC ) ); } while( keyshasMoreElements() ) { String name = (String)keysnextElement(); byte[] value = (byte[])getChanges()get( name ); LDAPAttribute attr = new LDAPAttribute( name, value );
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modsadd( LDAPModificationREPLACE, attr ); } Systemoutprintln( "LDAPPreferencessave: " + mods ); ldcmodify( _urlgetDN(), mods ); _hasOc = true; getChanges()clear(); return true; } catch ( LDAPException e ) { Systemerrprintln( "LDAPPreferencessave: " + e ); } return false; }
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LDAPPreferences1 has a few member variables of its own:
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public final String PREFERENCES_OC = "teexPreferences"; private private private private private LDAPUrl _searchUrl = null; // Host, port, base DN LDAPUrl _url = null; // Complete URL of user entry String _password = null; // User password Hashtable _allowed = null; // Preference attributes boolean _hasOc = false;
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Now we are ready to use our Preferences class with Teex The Teex class has the following constructors (other than the blank constructor for deserialization):
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public Teex( javaxswingJFrame frame ) public Teex( javaxswingJFrame frame, String filePath, String encoding)
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We ll add a parameter to each for a Preferences object:
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public Teex( javaxswingJFrame frame, Preferences prefs ) public Teex( javaxswingJFrame frame, String filePath, String encoding, Preferences prefs )
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In the following block of code, the constructors fetch any preferences that are in the object and copy them to internal variables Any preferences not available from the object are ignored, and initial default values are used Note that the rst call to get a value from the object will cause it to be initialized from the directory because the Preferences object we are passing is actually an instance of LDAPPreferences1
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public Teex( javaxswingJFrame frame, Preferences prefs ) { initializePreferences( prefs ); } /** * Get the values we need from the preferences object * * @param prefs an object containing application preferences */ protected void initializePreferences( Preferences prefs ) { g_prefs = prefs; if ( g_prefs == null ) { return; } String key = "teexbackground"; try { int i = g_prefsgetInteger( key ); textAreaBackground = new Color( i ); } catch ( Exception e ) { // If the value was not there, stick with the default Systemoutprintln( "Teex: no preference " + key ); } key = "teexforeground"; try { int i = g_prefsgetInteger( key ); textAreaForeground = new Color( i ); } catch ( Exception e ) { Systemoutprintln( "Teex: no preference " + key ); } key = "teextabsize"; try { int i = g_prefsgetInteger( key ); tabSize = i; } catch ( Exception e ) { Systemoutprintln( "Teex: no preference " + key ); } key = "teexfontsize"; try { int i = g_prefsgetInteger( key ); fontSize = i; } catch ( Exception e ) {
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Systemoutprintln( "Teex: no preference " + key ); } key = "teexlinewrap"; try { boolean wrap = g_prefsgetBoolean( key ); lineWrap = wrap; } catch ( Exception e ) { Systemoutprintln( "Teex: no preference " + key ); } }
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The internal variables are then used to initialize and con gure the Teex panels, just as before When the user changes preferences by interacting with the View menu, the changes are also recorded in the preferences object For example, when line wrap is enabled or disabled, the corresponding value is recorded as a boolean:
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wrapMenu = new JMenuItem(lineWrap "Do Not Wrap Lines" : "Wrap Lines"); wrapMenuaddActionListener (new ActionListener() { public void actionPerformed(ActionEvent e) { lineWrap = !lineWrap; textAreasetLineWrap(lineWrap); wrapMenusetText(lineWrap "Do Not Wrap Lines" : "Wrap Lines"); g_prefssetBoolean( teexlinewrap , lineWrap ); }; }); viewMenuadd(wrapMenu);
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When the user selects Exit from the File menu, the preferences are saved before the application terminates:
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JMenuItem exitMenu = new JMenuItem("Exit"); exitMenuaddActionListener (new ActionListener() { public void actionPerformed( ActionEvent e ) { g_frameCount ; if ( g_frameCount <= 0 ) { g_prefssave(); g_framedispose(); Systemexit(0); // close the application } } });