Examples of java.util.prefs.Preferences.keys()

java.util.prefs.Preferences.keys()
Returns all of the keys that have an associated value in this preference node. (The returned array will be of size zero if this node has no preferences.)
If the implementation supports stored defaults and there are any such defaults at this node that have not been overridden, by explicit preferences, the defaults are returned in the array in addition to any explicit preferences. @return an array of the keys that have an associated value in thispreference node. @throws BackingStoreException if this operation cannot be completeddue to a failure in the backing store, or inability to communicate with it. @throws IllegalStateException if this node (or an ancestor) has beenremoved with the {@link #removeNode()} method.

        continue;
      }


      final long authTime = authNode.getLong(VERSION_KEY, 0);
      final DataHolder<T> data = new DataHolder<T>(create(url, authTime));
      final String[] options = authNode.keys();
      for (int j = 0; j < options.length; j++)
      {
        final String option = options[j];
        if (option.startsWith("#"))
        {

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            String newPassword = admin.generatePassword();


            String urlGUID = makeGUID(userName, newPassword);


            Preferences pref = user.getUserAttributes();
            String[] keys = pref.keys();
            Map userAttributes = new HashMap();
            if (keys != null)
            {
                for (int ix = 0; ix < keys.length; ix++)
                {

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        Principal userPrincipal = createPrincipal(user.getSubject(), UserPrincipal.class);             
        this.principal = userPrincipal.getName();
        try
        {
            Preferences userAttributes = user.getUserAttributes();
            String[] keys = userAttributes.keys();
            for (int ix = 0; ix < keys.length; ix++)
            {
                attributes.put(keys[ix], userAttributes.get(keys[ix], null));
            }
        }

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                // Loading the userinfo
                User user = userManager.getUser(principal.getName());
                if(user != null)
                {
                  Preferences prefs = user.getUserAttributes();
                  String[] prefKeys = prefs.keys();
                  Map prefsSet = new HashMap();
                  for(int i = 0; i<prefKeys.length; i++)
                  {
                    prefsSet.put(prefKeys[i], prefs.get(prefKeys[i], "No value"));                    
                  }

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                        {
                            Preferences userInfoPrefs = userPrefs.node(userInfoPropertySet);
                            String[] propertyKeys = null;
                            try
                            {
                                propertyKeys = userInfoPrefs.keys();
                                if ((null != propertyKeys) && log.isDebugEnabled())
                                {
                                    log.debug("Found " + propertyKeys.length + " children for " + userInfoPrefs.absolutePath());
                                }
                            }

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    {
        try
        {
            Preferences descNode = prefNode.node("description");
           
            String[] keys = descNode.keys();
            ArrayList descs = new ArrayList(keys.length);
            for(int i=0; i < keys.length; i++)
            {
                PreferenceDescriptionImpl desc = new PreferenceDescriptionImpl();
                String localeKey = keys[i];

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        // No property has been defined nor added to the node. This should return
        // the property value
        Preferences pref0 = Preferences.userRoot();
        try
        {
            String[] propertyKeys = pref0.keys();
            if (propertyKeys.length > 0)
            {
                assertTrue("expected no children, " + propertyKeys.length + ", " + propertyKeys[0],
                        propertyKeys.length == 0);
            }

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        assertTrue("expected prop1 == true, " + prop1, prop1.equals("true"));


        // There should be 1 property under pref1.
        try
        {
            String[] propertyKeys = pref1.keys();
            assertEquals("expected 1 child, ", 1, propertyKeys.length);
        }
        catch (BackingStoreException bse)
        {
            assertTrue("backing store exception: " + bse, false);

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        Principal userPrincipal = createPrincipal(user.getSubject(), UserPrincipal.class);             
        this.principal = userPrincipal.getName();
        try
        {
            Preferences userAttributes = user.getUserAttributes();
            String[] keys = userAttributes.keys();
            for (int ix = 0; ix < keys.length; ix++)
            {
                attributes.put(keys[ix], userAttributes.get(keys[ix], null));
            }
        }

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            String newPassword = admin.generatePassword();


            String urlGUID = makeGUID(userName, newPassword);


            Preferences pref = user.getUserAttributes();
            String[] keys = pref.keys();
            Map userAttributes = new HashMap();
            if (keys != null)
            {
                for (int ix = 0; ix < keys.length; ix++)
                {

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