--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/configurationengine/source/plugins/common/ConeRulePlugin/ruleplugin/evals/layer_utils.py	Thu Mar 11 17:04:37 2010 +0200
@@ -0,0 +1,119 @@
+# Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+# All rights reserved.
+# This component and the accompanying materials are made available
+# under the terms of "Eclipse Public License v1.0"
+# which accompanies this distribution, and is available
+# at the URL "http://www.eclipse.org/legal/epl-v10.html".
+#
+# Initial Contributors:
+# Nokia Corporation - initial contribution.
+#
+# Contributors:
+#
+# Description: 
+#
+
+'''
+Ruleml eval extension to check is passed ref changed on given layer(range).
+'''
+
+from cone.public import api
+
+import logging
+
+logger = logging.getLogger('cone.ruleplugin.evals.layer_utils')
+
+def give_changed_layers(feat):
+    """
+    Returns a list of booleans where True means that feature is changed in that layer. Index is
+    same than in configuration root's get_configuration_by_index(). 
+    """
+    
+    logger.debug('Checking feature: %s' % feat.fqr)
+    
+    root_conf = feat.get_root_configuration()
+    nro_of_layers = len(root_conf.list_configurations())
+    result = [False] * nro_of_layers
+    
+    for i in range(0, nro_of_layers):
+        conf = root_conf.get_configuration_by_index(i)
+        logger.debug("Traversing data from configuration: %s" % conf.get_path())
+        datas = conf._traverse(type=api.Data, filters=[lambda d: d.fqr==feat.fqr])
+        for data in datas:
+            try:
+                if data.get_value() != None:
+                    logger.debug("Feature '%s' is changed in layer %s with data '%s'" % (feat.fqr, i, data.get_value()))
+                    result[i] = True
+            except Exception, e:
+                logger.debug("Failed to check Feature '%s' data in layer %s:", (e,i))
+        if result[i] == False:
+            logger.debug("Feature '%s' is not changed in layer: %s" % (feat.fqr, i))
+    logger.debug("Feature '%s' is changed in layers: %s" % (feat.fqr, result))
+    return result
+
+def changed_on_last_layer(feat):
+    """
+    Returns True if feature is changed in the last layer.
+    """
+    
+    root_conf = feat.get_root_configuration()
+    conf = root_conf.get_configuration_by_index(-2)#autoconfig layer is ignored 
+    
+    def check(node):
+        if isinstance(node, api.Data) and node.fqr == feat.fqr:
+            return True
+        for obj in node._objects():
+            if check(obj):
+                return True
+    
+    if check(conf):
+        return True
+    else:
+        return False
+
+def changed_on_autoconfig_layer(feat):
+    """
+    Returns True if feature is changed in the autoconfig layer.
+    """
+    
+    root_conf = feat.get_root_configuration()
+    conf = root_conf.get_configuration_by_index(-1) 
+    
+    def check(node):
+        if isinstance(node, api.Data) and node.fqr == feat.fqr:
+            return True
+        for obj in node._objects():
+            if check(obj):
+                return True
+    
+    if check(conf):
+        return True
+    else:
+        return False
+
+def changed_on_layer(feat, layer):
+    """
+    Returns True if feature is changed in the given layer.
+    """
+    try:
+        return give_changed_layers(feat)[layer]
+    except IndexError, e:
+        logger.warning("Given layer is not found: %s" % (layer))
+        return False
+
+def changed_on_layers(feat, findex, tindex):
+    """
+    Returns True if feature is changed in layer of given range.
+    """
+    layers = give_changed_layers(feat)
+    
+    if findex == tindex:
+        return changed_on_layer(feat, findex)
+    
+    for i in range(findex, tindex):
+        if i > len(layers):
+            continue
+        if layers != None and layers[i] != None and layers[i]:
+            return True
+    return False
+