Deserialize EntryHeader parameters

The EntryHeader would set the map of all its parameters as its name
member, which semantically does not make sense and requires a user to
parse the name member itself to find the actual name of the header.

Deserialize the EntryHeader according to the TSP to set members
"name", "tooltip" and "data_type".

tree_model.py

@@ -54,7 +54,7 @@ def print(self):
         if self._headers is not None:
             headers = []
             for header in self._headers:
-                headers.append(header.name["name"])
+                headers.append(header.name)
             for child in self._root.get_children():
                 data = child.print(data, 0)
             frame = {}

tsp/entry.py

@@ -22,19 +22,32 @@
 
 """Entry classes file."""
 
+from enum import Enum
+
 from tsp.output_element_style import OutputElementStyle
 
 ID_KEY = "id"
 PARENT_ID_KEY = "parentId"
 LABELS_KEY = "labels"
 STYLE_KEY = "style"
 HEADER_NAME_KEY = "name"
+HEADER_DATA_TYPE_KEY = "dataType"
+HEADER_TOOLTIP_KEY = "tooltip"
 UNKNOWN_ID = -1
-NAME_KEY = "name"
-TOOLTIP_KEY = "tooltip"
 
 # pylint: disable=too-few-public-methods
 
+class EntryHeaderDataType(Enum):
+    '''
+    The data types of a column entry.
+    '''
+    NUMBER = "NUMBER"
+    BINARY_NUMBER = "BINARY_NUMBER"
+    TIMESTAMP = "TIMESTAMP"
+    DURATION = "DURATION"
+    STRING = "STRING"
+    TIME_RANGE = "TIME_RANGE"
+
 
 class EntryHeader:
     '''
@@ -43,9 +56,29 @@ class EntryHeader:
 
     def __init__(self, params):
         '''
-        Displayed name
+        Constructor
         '''
-        self.name = params
+
+        # Name for this header.
+        if HEADER_NAME_KEY in params:
+            self.name = params.get(HEADER_NAME_KEY)
+            del params[HEADER_NAME_KEY]
+        else:
+            self.name = None
+
+        # Tooltip for this header.
+        if HEADER_TOOLTIP_KEY in params:
+            self.tooltip = params.get(HEADER_TOOLTIP_KEY)
+            del params[HEADER_TOOLTIP_KEY]
+        else:
+            self.tooltip = None
+
+        # Data type for this header.
+        if HEADER_DATA_TYPE_KEY in params:
+            self.data_type = EntryHeaderDataType(params.get(HEADER_DATA_TYPE_KEY))
+            del params[HEADER_DATA_TYPE_KEY]
+        else:
+            self.data_type = None
 
 
 class Entry: