add product to the common package since it will be shared

src/main/java/edu/umd/dawn/common/enums/Product.java

+package edu.umd.dawn.common.enums;
+
+import edu.umd.dawn.common.exceptions.DawnException;
+import edu.umd.dawn.common.exceptions.BaseExceptions;
+import java.util.Map;
+
+public enum Product {
+    CORN(50.0);
+
+    public final double baseTemp;
+
+    private Product(double baseTemp) {
+        this.baseTemp = baseTemp;
+    }
+
+    public Map<String, Double> getStages(String mode, int value) {
+        if (!this.equals(CORN)) {
+            throw new DawnException(BaseExceptions.PRODUCT_UNSUPPORTED);
+        }
+
+        double harvestVal;
+        if (mode.equals("rm")) {
+            harvestVal = ((((double) value) - 95.0) * 22.0) + 2375.0;
+        } else {
+            harvestVal = (double) value;
+        }
+
+        return Map.of(
+                "emergence", harvestVal * 0.07,
+                "3LeafCollar", harvestVal * 0.13,
+                "6LeafCollar", harvestVal * 0.2,
+                "silk", harvestVal * 0.545,
+                "milk", harvestVal * 0.725,
+                "harvest", harvestVal);
+    }
+}

src/main/java/edu/umd/dawn/common/exceptions/BaseExceptions.java

@@ -35,4 +35,7 @@ public class BaseExceptions {
     public static DawnExceptionParameters INVALID_OFFSET(int offset) {
         return new DawnExceptionParameters(400, "BAD_REQUEST", String.format("offset of %d is invalid", offset), "");
     }
+
+    public static final DawnExceptionParameters PRODUCT_UNSUPPORTED = new DawnExceptionParameters(
+            400, "BAD_REQUEST", "This operation is unsupported for provided product", "");
 }