Added unit-independent search

dbrepo-search-service/omlib/thing.py

+from rdflib import BNode, URIRef, Literal, XSD
+
+
+class Thing:
+
+    def __init__(self, label=None, identifier=None):
+        if identifier is None:
+            self.identifier = BNode()
+        else:
+            self.identifier = URIRef(identifier)
+        if label is None:
+            self.prefLabels = []
+        else:
+            self.prefLabels = []
+            self.__add_label_to_array(self.prefLabels, label, None)
+        self.altLabels = []
+
+    def __add_label_to_array(self, array, label, language=None):
+        if isinstance(label, list):
+            for item in label:
+                self.__add_label_to_array(array, item, language)
+        else:
+            if language is None:
+                if isinstance(label, Literal) and not label in array:
+                    array.append(label)
+                else:
+                    label_lit = Literal(label, datatype=XSD.string)
+                    if not label_lit in array:
+                        array.append(label_lit)
+            else:
+                if isinstance(label, Literal) and not label in array:
+                    label_lit = Literal(label.normalize, language)
+                    array.append(label_lit)
+                else:
+                    label_lit = Literal(label, language)
+                    if not label_lit in array:
+                        array.append(label_lit)
+
+    def add_preferred_label(self, label, language=None):
+        # TODO Check if a preferred label in the specified language already exists, if so move the old one to alt labels
+        self.__add_label_to_array(self.prefLabels, label, language)
+
+    def add_alternative_label(self, label, language=None):
+        self.__add_label_to_array(self.altLabels, label, language)
+
+    def label(self):
+        label = self.preferred_label()
+        return label
+
+    def preferred_label(self, language=None):
+        result_label = None
+        if language is None:
+            for pref_label in self.prefLabels:
+                if pref_label.language is None:
+                    result_label = pref_label
+            if result_label is None:
+                for pref_label in self.prefLabels:
+                    if pref_label.language == 'en':
+                        result_label = pref_label
+        else:
+            for pref_label in self.prefLabels:
+                if pref_label.language == language:
+                    result_label = pref_label
+        return result_label
+
+    def all_labels(self):
+        labels = []
+        labels.extend(self.prefLabels)
+        labels.extend(self.altLabels)
+        return labels
+
+
+class SymbolThing(Thing):
+
+    def __init__(self, name=None, symbol=None, identifier=None):
+        super().__init__(name, identifier)
+        self.dimensions = []
+        self.symbols = []
+        self.add_symbol(symbol)
+
+    def add_symbol(self, symbol, language=None):
+        if isinstance(symbol, list):
+            for item in symbol:
+                self.__add_label_to_array(self.symbols, item, language)
+        else:
+            if language is None:
+                if isinstance(symbol, Literal) and not symbol in self.symbols:
+                    self.symbols.append(symbol)
+                else:
+                    label_lit = Literal(symbol, datatype=XSD.string)
+                    if not label_lit in self.symbols:
+                        self.symbols.append(label_lit)
+            else:
+                if isinstance(symbol, Literal) and not symbol in self.symbols:
+                    label_lit = Literal(symbol.normalize, language)
+                    self.symbols.append(label_lit)
+                else:
+                    label_lit = Literal(symbol, language)
+                    if not label_lit in self.symbols:
+                        self.symbols.append(label_lit)
+
+    def symbol(self):
+        symbol = self.preferred_symbol()
+        return symbol
+
+    def preferred_symbol(self, language=None):
+        result_symbol = None
+        if language is None:
+            for symbol in self.symbols:
+                if symbol.language is None:
+                    result_symbol = symbol
+            if result_symbol is None:
+                for symbol in self.symbols:
+                    if symbol.language == 'en':
+                        result_symbol = symbol
+        else:
+            for symbol in self.symbols:
+                if symbol.language == language:
+                    result_symbol = symbol
+        return result_symbol
+
+    def all_symbols(self):
+        return self.symbols