1 files changed, 32 insertions, 0 deletions
diff --git a/packages/contracts/src/utils/asset_wrapper.ts b/packages/contracts/src/utils/asset_wrapper.ts
new file mode 100644
index 000000000..4c345aa30
--- /dev/null
+++ b/packages/contracts/src/utils/asset_wrapper.ts
@@ -0,0 +1,32 @@
+import { assetProxyUtils } from '@0xproject/order-utils';
+import { BigNumber } from '@0xproject/utils';
+import * as _ from 'lodash';
+
+import { AbstractAssetWrapper } from '../abstract/abstract_asset_wrapper';
+
+interface ProxyIdToAssetWrappers {
+    [proxyId: number]: AbstractAssetWrapper;
+}
+
+export class AssetWrapper {
+    private _proxyIdToAssetWrappers: ProxyIdToAssetWrappers;
+    constructor(assetWrappers: AbstractAssetWrapper[]) {
+        this._proxyIdToAssetWrappers = {};
+        _.each(assetWrappers, assetWrapper => {
+            const proxyId = assetWrapper.getProxyId();
+            this._proxyIdToAssetWrappers[proxyId] = assetWrapper;
+        });
+    }
+    public async getBalanceAsync(owner: string, assetData: string): Promise<BigNumber> {
+        const proxyId = assetProxyUtils.decodeAssetDataId(assetData);
+        const assetWrapper = this._proxyIdToAssetWrappers[proxyId];
+        const balance = await assetWrapper.getBalanceAsync(owner, assetData);
+        return balance;
+    }
+    public async getProxyAllowanceAsync(owner: string, assetData: string): Promise<BigNumber> {
+        const proxyId = assetProxyUtils.decodeAssetDataId(assetData);
+        const assetWrapper = this._proxyIdToAssetWrappers[proxyId];
+        const balance = await assetWrapper.getProxyAllowanceAsync(owner, assetData);
+        return balance;
+    }
+}