From 51e5eed1c5f4394b05e2c2ec4f9f54aafee64373 Mon Sep 17 00:00:00 2001
From: Robin Cheney <cheneyr@eternal.ddnss.de>
Date: Wed, 19 Nov 2025 10:29:26 +0100
Subject: [PATCH] added method to grab all fuel stations that serve a specific
 type of fuel

---
 .../diejungsvondertanke/tankstelle/Main.java  | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/src/main/java/de/diejungsvondertanke/tankstelle/Main.java b/src/main/java/de/diejungsvondertanke/tankstelle/Main.java
index 944e219..1924ebf 100644
--- a/src/main/java/de/diejungsvondertanke/tankstelle/Main.java
+++ b/src/main/java/de/diejungsvondertanke/tankstelle/Main.java
@@ -14,6 +14,7 @@ import de.diejungsvondertanke.tankstelle.error.NoSuchFuelTypeError;
  * @author Robin Cheney
  * @author Nils Göbbert
  * @author Leander Schnurrer
+ * @author Jef Bettenworth
  */
 public class Main {
     /**
@@ -323,4 +324,32 @@ public class Main {
         return sum;
     }
 
+    /**
+     * Returns all fuel stations that offer a specific type of fuel. The method
+     * iterates over all existing fuel stations and checks whethertheir internal
+     * fuel array (fuels[]) contains a Fuel object whose{@code FUEL_TYPE} matches
+     * the given {@code wantedType}. Every matching fuel station is added to the
+     * result and returned as an ArrayList.
+     * 
+     * @param wantedType The fuel type to filter for.
+     * 
+     * @return An ArrayList of all fuel stations that offer the specified fuel type.
+     * 
+     * @author Jef Bettenworth
+     */
+    public static ArrayList<FuelStation> getFuelStationsByFuelType(FuelType wantedType) {
+        ArrayList<FuelStation> result = new ArrayList<>();
+
+        for (FuelStation station : fuelStations) {
+            for (Fuel fuel : station.fuels) {
+                if (fuel.FUEL_TYPE == wantedType) {
+                    result.add(station);
+                    break; // keine Duplikate
+                }
+            }
+        }
+
+        return result;
+    }
+
 }
\ No newline at end of file
-- 
2.43.0