Move go-sql-queryrepo package into go-kit/sqr

Signed-off-by: Jan Tytgat <jan.tytgat@corelayer.eu>

sqr/collection.go

@@ -0,0 +1,36 @@
+package queryrepo
+
+import (
+	"fmt"
+)
+
+// newCollection creates a new collection with the supplied name and returns it to the caller.
+func newCollection(name string) collection {
+	return collection{
+		name:    name,
+		queries: make(map[string]string),
+	}
+}
+
+type collection struct {
+	name    string
+	queries map[string]string
+}
+
+// add adds a query to the collection.
+func (c *collection) add(name, query string) error {
+	if _, ok := c.queries[name]; ok {
+		return fmt.Errorf("query %s already exists", name)
+	}
+	c.queries[name] = query
+	return nil
+}
+
+// get retrieves a query from the collection by name.
+// If the query name cannot be found, get() returns an empty string and an error.
+func (c *collection) get(name string) (string, error) {
+	if _, ok := c.queries[name]; !ok {
+		return "", fmt.Errorf("query %s not found in collection %s", name, c.name)
+	}
+	return c.queries[name], nil
+}