1 files changed, 75 insertions, 0 deletions
diff --git a/src/client/northstar/utils/Utils.ts b/src/client/northstar/utils/Utils.ts
new file mode 100644
index 000000000..b35dce820
--- /dev/null
+++ b/src/client/northstar/utils/Utils.ts
@@ -0,0 +1,75 @@
+import { IBaseBrushable } from '../core/brusher/IBaseBrushable'
+import { IBaseFilterConsumer } from '../core/filter/IBaseFilterConsumer'
+import { IBaseFilterProvider } from '../core/filter/IBaseFilterProvider'
+import { AggregateFunction } from '../model/idea/idea'
+
+export class Utils {
+
+    public static EqualityHelper(a: Object, b: Object): boolean {
+        if (a === b) return true;
+        if (a === undefined && b !== undefined) return false;
+        if (a === null && b !== null) return false;
+        if (b === undefined && a !== undefined) return false;
+        if (b === null && a !== null) return false;
+        if ((<any>a).constructor.name !== (<any>b).constructor.name) return false;
+        return true;
+    }
+
+    public static LowercaseFirstLetter(str: string) {
+        return str.charAt(0).toUpperCase() + str.slice(1);
+    }
+
+    //
+    // this Type Guard tests if dropTarget is an IDropTarget.  If it is, it coerces the compiler
+    // to treat the dropTarget parameter as an IDropTarget *ouside* this function scope (ie, in
+    // the scope of where this function is called from).
+    //
+
+    public static isBaseBrushable<T>(obj: Object): obj is IBaseBrushable<T> {
+        let typed = <IBaseBrushable<T>>obj;
+        return typed != null && typed.BrusherModels !== undefined;
+    }
+
+    public static isBaseFilterProvider(obj: Object): obj is IBaseFilterProvider {
+        let typed = <IBaseFilterProvider>obj;
+        return typed != null && typed.FilterModels !== undefined;
+    }
+
+    public static isBaseFilterConsumer(obj: Object): obj is IBaseFilterConsumer {
+        let typed = <IBaseFilterConsumer>obj;
+        return typed != null && typed.FilterOperand !== undefined;
+    }
+
+    public static EncodeQueryData(data: any): string {
+        const ret = [];
+        for (let d in data) {
+            ret.push(encodeURIComponent(d) + "=" + encodeURIComponent(data[d]));
+        }
+        return ret.join("&");
+    }
+
+    public static ToVegaAggregationString(agg: AggregateFunction): string {
+        if (agg === AggregateFunction.Avg) {
+            return "average";
+        }
+        else if (agg === AggregateFunction.Count) {
+            return "count";
+        }
+        else {
+            return "";
+        }
+    }
+
+    public static GetQueryVariable(variable: string) {
+        let query = window.location.search.substring(1);
+        let vars = query.split("&");
+        for (let i = 0; i < vars.length; i++) {
+            let pair = vars[i].split("=");
+            if (decodeURIComponent(pair[0]) == variable) {
+                return decodeURIComponent(pair[1]);
+            }
+        }
+        return undefined;
+    }
+}
+