Examples of org.eclipse.core.runtime.Preferences

org.eclipse.core.runtime.Preferences
A table of preference settings, mapping named properties to values. Property names are non-empty strings; property values can be either booleans, non-null strings, or values of one of the primitive number types. The table consists of two, sparse, layers: the lower layer holds default values for properties, and the upper layer holds explicitly set values for properties. Normal retrieval looks for an explicitly set value for the given property in the upper layer; if there is nothing for that property in the upper layer, it next looks for a default value for the given property in the lower layer; if there is nothing for that property in the lower layer, it returns a standard default-default value. The default-default values for the primitive types are as follows:
- boolean = false
- double = 0.0
- float = 0.0f
- int = 0
- long = 0L
- String = "" (the empty string)
Internally, all properties values (in both layers) are stored as strings. Standard conversions to and from numeric and boolean types are performed on demand.

The typical usage is to establish the defaults for all known properties and then restore previously stored values for properties whose values were explicitly set. The existing settings can be changed and new properties can be set (setValue). If the values specified is the same as the default value, the explicit setting is deleted from the top layer. It is also possible to reset a property value back to the default value using setToDefault. After the properties have been modified, the properties with explicit settings are written to disk. The default values are never saved. This two-tiered approach to saving and restoring property setting minimizes the number of properties that need to be persisted; indeed, the normal starting state does not require storing any properties at all. It also makes it easy to use different default settings in different environments while maintaining just those property settings the user has adjusted.

A property change event is reported whenever a property's value actually changes (either through setValue, setToDefault). Note, however, that manipulating default values (with setDefault) does not cause any events to be reported.

Clients may instantiate this class. This class was not designed to be subclassed.

The implementation is based on a pair of internal java.util.Properties objects, one holding explicitly set values (set using setValue), the other holding the default values (set using setDefaultValue). The load and store methods persist the non-default property values to streams (the default values are not saved).

If a client sets a default value to be equivalent to the default-default for that type, the value is still known to the preference store as having a default value. That is, the name will still be returned in the result of the defaultPropertyNames and contains methods.
@since 2.0

  /*
   * Update eclipse preferences from old preferences.
   */
   private void updatePreferences(IEclipsePreferences preferences) {
     
     Preferences oldPreferences = loadPreferences();
     if (oldPreferences != null) {
       String[] propertyNames = oldPreferences.propertyNames();
      for (int i = 0; i < propertyNames.length; i++){
        String propertyName = propertyNames[i];
          String propertyValue = oldPreferences.getString(propertyName);
          if (!"".equals(propertyValue)) { //$NON-NLS-1$
            preferences.put(propertyName, propertyValue);
          }
      }
      try {

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    preferences = loadPreferences();
    if (preferences == null) preferences = new Preferences();
    perProjectInfo.preferences = preferences;
    return preferences;
    */
    return new Preferences();
  }

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  /**
   * load preferences from a shareable format (VCM-wise)
   */
   private Preferences loadPreferences() {
     
     Preferences preferences = new Preferences();
     IPath projectMetaLocation = getPluginWorkingLocation();
    if (projectMetaLocation != null) {
      File prefFile = projectMetaLocation.append(PREF_FILENAME).toFile();
      if (prefFile.exists()) { // load preferences from file
        InputStream in = null;
        try {
          in = new BufferedInputStream(new FileInputStream(prefFile));
          preferences.load(in);
        } catch (IOException e) { // problems loading preference store - quietly ignore
        } finally {
          if (in != null) {
            try {
              in.close();

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    {
        monitor.beginTask( BrowserCoreMessages.jobs__export_csv_task, 2 );
        monitor.reportProgress( " " ); //$NON-NLS-1$
        monitor.worked( 1 );


        Preferences coreStore = BrowserCorePlugin.getDefault().getPluginPreferences();


        String attributeDelimiter = coreStore.getString( BrowserCoreConstants.PREFERENCE_FORMAT_CSV_ATTRIBUTEDELIMITER );
        String valueDelimiter = coreStore.getString( BrowserCoreConstants.PREFERENCE_FORMAT_CSV_VALUEDELIMITER );
        String quoteCharacter = coreStore.getString( BrowserCoreConstants.PREFERENCE_FORMAT_CSV_QUOTECHARACTER );
        String lineSeparator = coreStore.getString( BrowserCoreConstants.PREFERENCE_FORMAT_CSV_LINESEPARATOR );
        String encoding = coreStore.getString( BrowserCoreConstants.PREFERENCE_FORMAT_CSV_ENCODING );
        int binaryEncoding = coreStore.getInt( BrowserCoreConstants.PREFERENCE_FORMAT_CSV_BINARYENCODING );
        String[] exportAttributes = this.searchParameter.getReturningAttributes();


        try
        {
            // open file

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    {
        monitor.beginTask( BrowserCoreMessages.jobs__export_odf_task, 2 );
        monitor.reportProgress( " " ); //$NON-NLS-1$
        monitor.worked( 1 );


        Preferences coreStore = BrowserCorePlugin.getDefault().getPluginPreferences();
        String valueDelimiter = coreStore.getString( BrowserCoreConstants.PREFERENCE_FORMAT_ODF_VALUEDELIMITER );
        int binaryEncoding = coreStore.getInt( BrowserCoreConstants.PREFERENCE_FORMAT_ODF_BINARYENCODING );


        // export
        try
        {
            OdfSpreadsheetDocument doc = OdfSpreadsheetDocument.createSpreadsheetDocument();

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    {
        monitor.beginTask( BrowserCoreMessages.jobs__export_xls_task, 2 );
        monitor.reportProgress( " " ); //$NON-NLS-1$
        monitor.worked( 1 );


        Preferences coreStore = BrowserCorePlugin.getDefault().getPluginPreferences();
        String valueDelimiter = coreStore.getString( BrowserCoreConstants.PREFERENCE_FORMAT_XLS_VALUEDELIMITER );
        int binaryEncoding = coreStore.getInt( BrowserCoreConstants.PREFERENCE_FORMAT_XLS_BINARYENCODING );


        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet( "Export" ); //$NON-NLS-1$


        // header

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            }
            saslRealmText.setEnabled( isSaslRealmTextEnabled() );
        }


        // TODO: get setting from global preferences.
        Preferences preferences = ConnectionCorePlugin.getDefault().getPluginPreferences();
        boolean useKrb5SystemProperties = preferences
            .getBoolean( ConnectionCoreConstants.PREFERENCE_USE_KRB5_SYSTEM_PROPERTIES );
        if ( krb5Composite != null )
        {
            krb5CredentialConfigurationUseNativeButton.setEnabled( isGssapiEnabled() && !useKrb5SystemProperties );
            krb5CredentialConfigurationObtainTgtButton.setEnabled( isGssapiEnabled() && !useKrb5SystemProperties );

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    return true;
  }


  public void setDefaults(ILaunchConfigurationWorkingCopy config)
  {
    Preferences pref = HelpPlugin.getDefault().getPluginPreferences();
    String browserPath =
      pref.getString(org.eclipse.help.internal.browser.CustomBrowser.CUSTOM_BROWSER_PATH_KEY);


    config.setAttribute(PerlLaunchConfigurationConstants.ATTR_BROWSER_ID, BrowserManager.getInstance().getDefaultBrowserID()); //$NON-NLS-1$;
    config.setAttribute(
      PerlLaunchConfigurationConstants.ATTR_CUSTOM_BROWSER_PATH,
      browserPath);

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  private String fMixedWhitespaceStrategy = XMLFormattingConstraints.IGNORE;
  private String fOneIndent = "\t"; //$NON-NLS-1$
  private boolean fClearAllBlankLines = false;


  public XMLFormattingPreferences() {
    Preferences preferences = XMLCorePlugin.getDefault().getPluginPreferences();
    if (preferences != null) {
      setFormatCommentText(preferences.getBoolean(XMLCorePreferenceNames.FORMAT_COMMENT_TEXT));
      setJoinCommentLines(preferences.getBoolean(XMLCorePreferenceNames.FORMAT_COMMENT_JOIN_LINES));


      setMaxLineWidth(preferences.getInt(XMLCorePreferenceNames.LINE_WIDTH));
      setIndentMultipleAttributes(preferences.getBoolean(XMLCorePreferenceNames.SPLIT_MULTI_ATTRS));
      setAlignFinalBracket(preferences.getBoolean(XMLCorePreferenceNames.ALIGN_END_BRACKET));
      setSpaceBeforeEmptyCloseTag(preferences.getBoolean(XMLCorePreferenceNames.SPACE_BEFORE_EMPTY_CLOSE_TAG));
      
      boolean preservepcdata = preferences.getBoolean(XMLCorePreferenceNames.PRESERVE_CDATACONTENT);
      if (preservepcdata)
        fPCDataWhitespaceStrategy = XMLFormattingPreferences.PRESERVE;
      else
        fPCDataWhitespaceStrategy = XMLFormattingPreferences.COLLAPSE;


      char indentChar = ' ';
      String indentCharPref = preferences.getString(XMLCorePreferenceNames.INDENTATION_CHAR);
      if (XMLCorePreferenceNames.TAB.equals(indentCharPref)) {
        indentChar = '\t';
      }
      int indentationWidth = preferences.getInt(XMLCorePreferenceNames.INDENTATION_SIZE);


      StringBuffer indent = new StringBuffer();
      for (int i = 0; i < indentationWidth; i++) {
        indent.append(indentChar);
      }
      setOneIndent(indent.toString());
      setClearAllBlankLines(preferences.getBoolean(XMLCorePreferenceNames.CLEAR_ALL_BLANK_LINES));
    }
  }

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    }




    public static LdifFormatParameters getLdifFormatParameters()
    {
        Preferences store = BrowserCorePlugin.getDefault().getPluginPreferences();
        boolean spaceAfterColon = store.getBoolean( BrowserCoreConstants.PREFERENCE_LDIF_SPACE_AFTER_COLON );
        int lineWidth = store.getInt( BrowserCoreConstants.PREFERENCE_LDIF_LINE_WIDTH );
        String lineSeparator = store.getString( BrowserCoreConstants.PREFERENCE_LDIF_LINE_SEPARATOR );
        LdifFormatParameters ldifFormatParameters = new LdifFormatParameters( spaceAfterColon, lineWidth, lineSeparator );
        return ldifFormatParameters;
    }

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