fork github.com/doug-martin

exp/window.go

@@ -0,0 +1,90 @@
+package exp
+
+type sqlWindowExpression struct {
+	name          IdentifierExpression
+	parent        IdentifierExpression
+	partitionCols ColumnListExpression
+	orderCols     ColumnListExpression
+}
+
+func NewWindowExpression(window, parent IdentifierExpression, partitionCols, orderCols ColumnListExpression) WindowExpression {
+	if partitionCols == nil {
+		partitionCols = NewColumnListExpression()
+	}
+	if orderCols == nil {
+		orderCols = NewColumnListExpression()
+	}
+	return sqlWindowExpression{
+		name:          window,
+		parent:        parent,
+		partitionCols: partitionCols,
+		orderCols:     orderCols,
+	}
+}
+
+func (we sqlWindowExpression) clone() sqlWindowExpression {
+	return sqlWindowExpression{
+		name:          we.name,
+		parent:        we.parent,
+		partitionCols: we.partitionCols.Clone().(ColumnListExpression),
+		orderCols:     we.orderCols.Clone().(ColumnListExpression),
+	}
+}
+
+func (we sqlWindowExpression) Clone() Expression {
+	return we.clone()
+}
+
+func (we sqlWindowExpression) Expression() Expression {
+	return we
+}
+
+func (we sqlWindowExpression) Name() IdentifierExpression {
+	return we.name
+}
+
+func (we sqlWindowExpression) HasName() bool {
+	return we.name != nil
+}
+
+func (we sqlWindowExpression) Parent() IdentifierExpression {
+	return we.parent
+}
+
+func (we sqlWindowExpression) HasParent() bool {
+	return we.parent != nil
+}
+
+func (we sqlWindowExpression) PartitionCols() ColumnListExpression {
+	return we.partitionCols
+}
+
+func (we sqlWindowExpression) HasPartitionBy() bool {
+	return we.partitionCols != nil && !we.partitionCols.IsEmpty()
+}
+
+func (we sqlWindowExpression) OrderCols() ColumnListExpression {
+	return we.orderCols
+}
+
+func (we sqlWindowExpression) HasOrder() bool {
+	return we.orderCols != nil && !we.orderCols.IsEmpty()
+}
+
+func (we sqlWindowExpression) PartitionBy(cols ...interface{}) WindowExpression {
+	ret := we.clone()
+	ret.partitionCols = NewColumnListExpression(cols...)
+	return ret
+}
+
+func (we sqlWindowExpression) OrderBy(cols ...interface{}) WindowExpression {
+	ret := we.clone()
+	ret.orderCols = NewColumnListExpression(cols...)
+	return ret
+}
+
+func (we sqlWindowExpression) Inherit(parent string) WindowExpression {
+	ret := we.clone()
+	ret.parent = ParseIdentifier(parent)
+	return ret
+}