#1 add mapper for filter expression

instana/utils/filter-expression-mapper.go

@@ -0,0 +1,31 @@
+package utils
+
+import (
+	"fmt"
+
+	"github.com/gessnerfl/terraform-provider-instana/instana/restapi"
+)
+
+func NewFilterExpressionMapper() FilterExpressionMapper {
+	return new(filterExpressionMapperImpl)
+}
+
+type FilterExpressionMapper interface {
+	FromApiModel(input restapi.MatchExpression) (*FilterExpression, error)
+	ToApiModel(input *FilterExpression) (*restapi.MatchExpression, error)
+}
+
+type filterExpressionMapperImpl struct{}
+
+func (i *filterExpressionMapperImpl) FromApiModel(input restapi.MatchExpression) (*FilterExpression, error) {
+	if input.GetType() == restapi.BinaryOperatorExpressionType {
+
+	} else if input.GetType() == restapi.LeafExpressionType {
+
+	}
+	return nil, fmt.Errorf("Unsupported match expression of type %s", input.GetType())
+}
+
+func (i *filterExpressionMapperImpl) ToApiModel(input *FilterExpression) (*restapi.MatchExpression, error) {
+	return nil, nil
+}