added exercise 4

exercises/exercise4.jv

@@ -0,0 +1,88 @@
+pipeline MowestaPipeline { 
+
+    block MowestaExtractor oftype HttpExtractor {
+        url: "https://www.mowesta.com/data/measure/mowesta-dataset-20221107.zip";
+    } 
+
+    block ZipArchiveInterpreter oftype ArchiveInterpreter {
+        archiveType: "zip";
+    } 
+
+    block MowestaDataFilePicker oftype FilePicker {
+        path: "/data.csv"; 
+    }
+
+    block MowestaInterpreter oftype TextFileInterpreter{
+    }
+
+    block MowestaCSVInterpreter oftype CSVInterpreter {
+        delimiter: ";";
+    } 
+
+    block RenameTemperaturCellWriter oftype CellWriter {
+         at: cell E1;
+        write: ["Temperatur"]; 
+    }
+
+    block RenameTemperaturBatteryCellWriter oftype CellWriter {
+         at: cell J1;
+        write: ["Batterietemperatur"]; 
+    }  
+
+    block MowestaTableInterpreter oftype TableInterpreter { 
+        header: true;
+        columns: [
+        "Geraet" oftype ValidGeraetNumber,
+        "Hersteller" oftype text, 
+        "Model" oftype text, 
+        "Monat" oftype integer, 
+        "Temperatur" oftype decimal, 
+        "Batterietemperatur" oftype decimal, 
+        "Geraet aktiv" oftype text, 
+        ];
+    } 
+
+    transform CelsiusToFahrenheit {
+        from Celsius oftype decimal;
+        to Fahrenheit oftype decimal;
+        Fahrenheit: (Celsius * 9/5) + 32; 
+    } 
+
+    block CelsiusToFahrenheitTransformer oftype TableTransformer {
+        inputColumns: ['Temperatur'];
+        outputColumn: 'Temperatur';
+        use: CelsiusToFahrenheit;
+    }
+
+    block CelsiusToFahrenheitBatteryTransformer oftype TableTransformer {
+        inputColumns: ['Batterietemperatur'];
+        outputColumn: 'Batterietemperatur';
+        use: CelsiusToFahrenheit;
+    } 
+
+    constraint ValidGeraetNumberRange on decimal:
+        value > 0; 
+
+
+    valuetype ValidGeraetNumber oftype integer {
+        constraints: [ ValidGeraetNumberRange ];
+    } 
+
+    block MowestaLoader oftype SQLiteLoader {
+        table: "temperatures";
+        file: "./temperatures.sqlite";
+     } 
+
+   MowestaExtractor 
+    -> ZipArchiveInterpreter
+    -> MowestaDataFilePicker
+    -> MowestaInterpreter
+    -> MowestaCSVInterpreter
+    -> RenameTemperaturCellWriter
+    -> RenameTemperaturBatteryCellWriter
+    -> MowestaTableInterpreter
+    -> CelsiusToFahrenheitTransformer
+    -> CelsiusToFahrenheitBatteryTransformer
+    -> MowestaLoader;
+
+}