EAGLESIX-2715: adding file back

lib/pipeline/expressions/SetIsSubsetExpression.js

@@ -0,0 +1,88 @@
+"use strict";
+
+/**
+ * A $setissubset pipeline expression.
+ * @see evaluateInternal
+ * @class SetIsSubsetExpression
+ * @namespace mungedb-aggregate.pipeline.expressions
+ * @module mungedb-aggregate
+ * @constructor
+ **/
+var SetIsSubsetExpression = module.exports = function SetIsSubsetExpression() {
+	if (arguments.length !== 2) throw new Error("two args expected");
+	base.call(this);
+}, klass = SetIsSubsetExpression,
+	FixedArityExpression = require("./FixedArityExpressionT")(klass, 2),
+	base = FixedArityExpression,
+	proto = klass.prototype = Object.create(base.prototype, {
+		constructor: {
+			value: klass
+		}
+	});
+
+// DEPENDENCIES
+var Value = require("../Value"),
+	Expression = require("./Expression");
+
+// PROTOTYPE MEMBERS
+proto.getOpName = function getOpName() {
+	return "$setissubset";
+};
+
+proto.optimize = function optimize(cachedRhsSet, operands) {
+
+// This optimize needs to be done, eventually
+
+// // perfore basic optimizations
+//     intrusive_ptr<Expression> optimized = ExpressionNary::optimize();
+
+//     // if ExpressionNary::optimize() created a new value, return it directly
+//     if (optimized.get() != this)
+//         return optimized;
+
+//     if (ExpressionConstant* ec = dynamic_cast<ExpressionConstant*>(vpOperand[1].get())) {
+//         const Value rhs = ec->getValue();
+//         uassert(17311, str::stream() << "both operands of $setIsSubset must be arrays. Second "
+//                                      << "argument is of type: " << typeName(rhs.getType()),
+//                 rhs.getType() == Array);
+
+//         return new Optimized(arrayToSet(rhs), vpOperand);
+//     }
+
+//     return optimized;
+
+};
+
+/**
+ * Takes 2 arrays. Assigns the second array to the first array.
+ * @method evaluateInternal
+ **/
+proto.evaluateInternal = function evaluateInternal(vars) {
+	var array1 = this.operands[0].evaluateInternal(vars),
+		array2 = this.operands[1].evaluateInternal(vars);
+	if (array1 instanceof Array) throw new Error(this.getOpName() + ": object 1 must be an array");
+	if (array2 instanceof Array) throw new Error(this.getOpName() + ": object 2 must be an array");
+
+	var sizeOfArray1 = array1.length;
+	var sizeOfArray2 = array2.length;
+	var outerLoop = 0;
+	var innerLoop = 0;
+	for (outerLoop = 0; outerLoop < sizeOfArray1; outerLoop++) {
+		for (innerLoop = 0; innerLoop < sizeOfArray2; innerLoop++) {
+			if (array2[outerLoop] == array1[innerLoop])
+				break;
+		}
+
+		/* If the above inner loop was not broken at all then
+		 array2[i] is not present in array1[] */
+		if (innerLoop == sizeOfArray2)
+			return false;
+	}
+
+	/* If we reach here then all elements of array2[]
+	 are present in array1[] */
+	return true;
+};
+
+/** Register Expression */
+Expression.registerExpression("$setissubset", base.parse);