Fixing capacity not being read correctly, gurobi status translation, simplification

Author: merschformann

java-gurobi-knapsack/src/main/java/com/nextmv/example/Input.java

@@ -6,9 +6,11 @@
 import java.util.stream.Collectors;
 
 import com.google.gson.Gson;
+import com.google.gson.annotations.SerializedName;
 
 public class Input {
   private final List<Item> items;
+  @SerializedName("weight_capacity")
   private final double weightCapacity;
 
   public Input(List<Item> items, double weightCapacity) {

java-gurobi-knapsack/src/main/java/com/nextmv/example/Main.java

@@ -8,10 +8,6 @@
 public final class Main {
 
   public static void main(String[] args) {
-    gurobiKnapsack(args);
-  }
-
-  public static void gurobiKnapsack(String[] args) {
     try {
       // Parse arguments.
       Options options = Options.fromArguments(args);
@@ -63,11 +59,11 @@ public static void gurobiKnapsack(String[] args) {
         }
       }
       Output output = new Output(
-          inputItems,
+          outputItems,
           model.get(GRB.DoubleAttr.Runtime),
           model.get(GRB.DoubleAttr.ObjVal),
           "Gurobi",
-          String.valueOf(model.get(GRB.IntAttr.Status)),
+          convertStatus(model.get(GRB.IntAttr.Status)),
           model.get(GRB.IntAttr.NumVars),
           model.get(GRB.IntAttr.NumConstrs));
 
@@ -83,4 +79,45 @@ public static void gurobiKnapsack(String[] args) {
       e.printStackTrace();
     }
   }
+
+  public static String convertStatus(int status) {
+    switch (status) {
+      case GRB.Status.LOADED:
+        return "LOADED";
+      case GRB.Status.OPTIMAL:
+        return "OPTIMAL";
+      case GRB.Status.INFEASIBLE:
+        return "INFEASIBLE";
+      case GRB.Status.INF_OR_UNBD:
+        return "INF_OR_UNBD";
+      case GRB.Status.UNBOUNDED:
+        return "UNBOUNDED";
+      case GRB.Status.CUTOFF:
+        return "CUTOFF";
+      case GRB.Status.ITERATION_LIMIT:
+        return "ITERATION_LIMIT";
+      case GRB.Status.NODE_LIMIT:
+        return "NODE_LIMIT";
+      case GRB.Status.TIME_LIMIT:
+        return "TIME_LIMIT";
+      case GRB.Status.SOLUTION_LIMIT:
+        return "SOLUTION_LIMIT";
+      case GRB.Status.INTERRUPTED:
+        return "INTERRUPTED";
+      case GRB.Status.NUMERIC:
+        return "NUMERIC";
+      case GRB.Status.SUBOPTIMAL:
+        return "SUBOPTIMAL";
+      case GRB.Status.INPROGRESS:
+        return "INPROGRESS";
+      case GRB.Status.USER_OBJ_LIMIT:
+        return "USER_OBJ_LIMIT";
+      case GRB.Status.WORK_LIMIT:
+        return "WORK_LIMIT";
+      case GRB.Status.MEM_LIMIT:
+        return "MEM_LIMIT";
+      default:
+        return "UNKNOWN";
+    }
+  }
 }

java-ortools-knapsack/src/main/java/com/nextmv/example/Input.java

@@ -6,9 +6,11 @@
 import java.util.stream.Collectors;
 
 import com.google.gson.Gson;
+import com.google.gson.annotations.SerializedName;
 
 public class Input {
   private final List<Item> items;
+  @SerializedName("weight_capacity")
   private final double weightCapacity;
 
   public Input(List<Item> items, double weightCapacity) {