Implemented CurrencySet

src/de/banananetwork/dsa/currencies/CurrencySet.java

@@ -0,0 +1,40 @@
+package de.banananetwork.dsa.currencies;
+
+import java.util.*;
+
+public class CurrencySet {
+
+	private final Currency[] currencies;
+
+	private CurrencySet(Currency[] currencies) {
+		this.currencies = currencies;
+	}
+
+	public Map<Currency, Integer> transferToSet(int baseValue) {
+		final Map<Currency, Integer> values = new EnumMap<>(Currency.class);
+		for (Currency currency : currencies) {
+			int value = currency.transferTo(baseValue);
+			values.put(currency, value);
+			baseValue -= currency.transferFrom(value);
+		}
+		if (baseValue != 0)
+			throw new RuntimeException(); // TODO Change to ValueNotRepresentableException
+		return values;
+	}
+
+	public static class Builder {
+
+		private List<Currency> currencies = new LinkedList<>();
+
+		public Builder add(Currency currency) {
+			this.currencies.add(currency);
+			return this;
+		}
+
+		public CurrencySet create() {
+			return new CurrencySet(currencies.stream().sorted(Comparator.comparing(Currency::getMultiplier).reversed()).toArray(Currency[]::new));
+		}
+
+	}
+
+}