feat: Added Exchange class as backbone of the project.

src/main/java/edu/ntnu/idi/idatt/Exchange.java

@@ -0,0 +1,81 @@
+package edu.ntnu.idi.idatt;
+
+import edu.ntnu.idi.idatt.marked.Share;
+import edu.ntnu.idi.idatt.marked.Stock;
+import edu.ntnu.idi.idatt.transaction.Purchase;
+import edu.ntnu.idi.idatt.transaction.Sale;
+import edu.ntnu.idi.idatt.transaction.Transaction;
+
+import java.math.BigDecimal;
+import java.util.*;
+
+public class Exchange {
+
+    //TODO: JavaDocs, Write over functions mby
+
+    private final String name;
+    private int week;
+    private HashMap<String, Stock> stockMap = new HashMap<>();
+    private Random random = new Random();
+
+    public Exchange(String name, List<Stock> stocks) {
+        this.name = name;
+        this.week = 1;
+
+        for(Stock stock : stocks){
+            stockMap.put(stock.getSymbol(), stock);
+        }
+
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getWeek() {
+        return week;
+    }
+
+    public boolean hasStock(String symbol) {
+        return stockMap.containsKey(symbol);
+    }
+
+    public Stock getStock(String symbol) {
+        if(this.hasStock(symbol)){
+            stockMap.get(symbol);
+        }
+        return null; //TODO: Exception
+    }
+
+    public List<Stock> findStocks(String searchTerm) {
+        ArrayList<Stock> stocksFound = new ArrayList<>();
+
+        for(Stock stock : stockMap.values()) {
+            if(stock.getCompany().contains(searchTerm) || stock.getSymbol().contains(searchTerm)){
+                stocksFound.add(stock);
+            }
+        }
+        return stocksFound;
+    }
+
+    public Transaction buy(String symbol, BigDecimal quantity, Player player) {
+        Share share = new Share(getStock(symbol), quantity, BigDecimal.valueOf(random.nextDouble()));
+        Purchase purchase = new Purchase(share, this.week);
+        purchase.commit(player);
+        return player.getTransactionArchive().getPurchases(this.week).getLast();
+    }
+
+    public Transaction sell(Share share, Player player) {
+        Sale sale = new Sale(share, this.week);
+        sale.commit(player);
+        return player.getTransactionArchive().getSales(this.week).getLast();
+    }
+
+    public void advance() {
+        for(Stock stocks : stockMap.values()) {
+            stocks.addNewSalesPrice(BigDecimal.valueOf(random.nextDouble()));
+        }
+    }
+
+
+}