Add another Abstract Economy that doesn't support banks

src/main/java/net/milkbowl/vault/economy/NoBankSupportAbstractEconomy.java

@@ -0,0 +1,74 @@
+package net.milkbowl.vault.economy;
+
+import java.util.List;
+import java.util.Collections;
+
+/**
+* Abstract class that removes the responsibility of implement
+* Bank methods for child classes that doesn't support banks
+*/
+public abstract class NoBankSupportEconomy extends AbstractEconomy {
+
+    // EconomyResponse class is immutable, it doesn't require the creation
+    // of more objects to return the same response
+    private final EconomyResponse response;
+
+    public NoBankSupportEconomy(String unsupportedMessage) {
+        this.response = new EconomyResponse(0, 0, EconomyResponse.ResponseType.NOT_IMPLEMENTED, unsupportedMessage);
+    }
+
+    public NoBankSupportEconomy() {
+        this("This economy manager doesn't support banks!");
+    }
+
+    @Override
+    public boolean hasBankSupport() {
+        return false;
+    }
+
+    @Override
+    public EconomyResponse createBank(String name, String playerName) {
+        return response;
+    }
+
+    @Override
+    public EconomyResponse deleteBank(String name) {
+        return response;
+    }
+
+    @Override
+    public EconomyResponse bankBalance(String name) {
+        return response;
+    }
+
+    @Override
+    public EconomyResponse bankHas(String name, double amount) {
+        return response;
+    }
+
+    @Override
+    public EconomyResponse bankWithdraw(String name, double amount) {
+        return response;
+    }
+
+    @Override
+    public EconomyResponse bankDeposit(String name, double amount) {
+        return response;
+    }
+
+    @Override
+    public EconomyResponse isBankOwner(String name, String playerName) {
+        return response;
+    }
+
+    @Override
+    public EconomyResponse isBankMember(String name, String playerName) {
+        return response;
+    }
+
+    @Override
+    public List<String> getBanks() {
+        return Collections.emptyList();
+    }
+
+}