feat: adds/Customized/DataTypesHW09

Author: nilejack

lesson_09/types/types_app/src/main/java/com/codedifferently/lesson9/dataprovider/DataProvider.java

@@ -1,51 +1,5 @@
 package com.codedifferently.lesson9.dataprovider;
 
-import java.util.List;
-import java.util.Map;
-import java.util.stream.Collectors;
+public class DataProvider {
 
-/**
- * This class is a base class for data providers. It provides a method for parsing data from a list
- * of maps.
- */
-public abstract class DataProvider {
-  /** Returns the name of the provider. */
-  public abstract String getProviderName();
-
-  /** Gets a map of column types keyed by column name. */
-  public abstract Map<String, Class> getColumnTypeByName();
-
-  /**
-   * Given a list of data objects, returns the list with values converted to the appropriate type.
-   *
-   * @param data A list of data objects containing values keyed by column name.
-   * @return A new list with object values converted to the appropriate type.
-   */
-  public List<Map<String, Object>> parseData(List<Map<String, String>> data) throws Exception {
-    Map<String, Class> columnTypeByName = getColumnTypeByName();
-    return data.stream().map(row -> parseRow(columnTypeByName, row)).collect(Collectors.toList());
-  }
-
-  /**
-   * Parses a single row of data using the provided column types mapping.
-   *
-   * @param columnTypeByName A map containing the type of a column keyed by its name.
-   * @param row A bag of values keyed by column name.
-   * @return A new list of data values converted to the appropriate type.
-   */
-  private Map<String, Object> parseRow(
-      Map<String, Class> columnTypeByName, Map<String, String> row) {
-    var parsedRow = new java.util.HashMap<String, Object>();
-    row.forEach(
-        (key, value) -> {
-          Class type = columnTypeByName.get(key);
-          try {
-            parsedRow.put(key, type.getConstructor(String.class).newInstance(value));
-          } catch (Exception e) {
-            throw new RuntimeException(
-                "Error parsing data for " + key + " as type " + type.getName());
-          }
-        });
-    return parsedRow;
-  }
 }

lesson_09/types/types_app/src/main/java/com/codedifferently/lesson9/dataprovider/NileJackProvider.java

@@ -10,6 +10,7 @@ public String getProviderName() {
     return "nilejack";
   }
 
+  @SuppressWarnings("rawtypes")
   public Map<String, Class> getColumnTypeByName() {
     return Map.of(
         "column1", Float.class,

lesson_09/types/types_app/src/main/java/com/codedifferently/lesson9/dataprovider/NileJacksonProvider.java

@@ -0,0 +1,23 @@
+package com.codedifferently.lesson9.dataprovider;
+
+import java.util.Map;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class NileJackProvider extends DataProvider {
+  public String getProviderName() {
+    return "nilejack";
+  }
+
+  public Map<String, Class> getColumnTypeByName() {
+    return Map.of(
+        "column1", Float.class,
+        "column2", Integer.class,
+        "column3", Short.class,
+        "column4", String.class,
+        "column5", Boolean.class,
+        "column6", Double.class,
+        "column7", Long.class);
+  }
+}

lesson_09/types/types_app/src/main/resources/data/nilejack.json

@@ -1,13 +1,12 @@
-[ 
-  package com.code 
+[
   {
-    "column1", Float.class,
-    "column2", Integer.class,
-    "column3", Short.class ,
-    "column4", String.class ,
-    "column5", Boolean.class,
-    "column6", Double.class ,
-    "column7", Long.class ,
+    "column1": "2.788476E38",
+    "column2": "23906",
+    "column3": "1.951334947469109E306",
+    "column4": "4vynlcbme89",
+    "column5": "true",
+    "column6": "1946511983",
+    "column7": "871716420668780160"
   },
   {
     "column1": "2.9218724E38",