From dca6d303c1d15d49305f538dd62df7a65cdfcc38 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Mon, 14 Nov 2016 00:57:29 +0100
Subject: add validators to checkable classes

---
 src/types.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/types.ts')

diff --git a/src/types.ts b/src/types.ts
index 39d374069..8f24fda90 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -360,8 +360,15 @@ interface Merchant {
   instance?: string;
 }
 
-@Checkable.Class
+@Checkable.ClassWithValidator
 export class Contract {
+
+  validate() {
+    if (this.exchanges.length == 0) {
+      throw Error("no exchanges in contract");
+    }
+  }
+
   @Checkable.String
   H_wire: string;
 
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