1 files changed, 65 insertions, 0 deletions
diff --git a/pkg/types/state_type.go b/pkg/types/state_type.go
new file mode 100644
index 0000000..f0cc69a
--- /dev/null
+++ b/pkg/types/state_type.go
@@ -0,0 +1,65 @@
+package types
+
+import (
+	"database/sql/driver"
+	"encoding"
+	"encoding/json"
+	"github.com/icinga/icingadb/internal"
+	"github.com/pkg/errors"
+)
+
+// StateType specifies a state's hardness.
+type StateType uint8
+
+// UnmarshalText implements the encoding.TextUnmarshaler interface.
+func (st *StateType) UnmarshalText(text []byte) error {
+	return st.UnmarshalJSON(text)
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface.
+func (st *StateType) UnmarshalJSON(data []byte) error {
+	var i uint8
+	if err := internal.UnmarshalJSON(data, &i); err != nil {
+		return err
+	}
+
+	s := StateType(i)
+	if _, ok := stateTypes[s]; !ok {
+		return badStateType(data)
+	}
+
+	*st = s
+	return nil
+}
+
+// Value implements the driver.Valuer interface.
+func (st StateType) Value() (driver.Value, error) {
+	if v, ok := stateTypes[st]; ok {
+		return v, nil
+	} else {
+		return nil, badStateType(st)
+	}
+}
+
+// badStateType returns and error about a syntactically, but not semantically valid StateType.
+func badStateType(t interface{}) error {
+	return errors.Errorf("bad state type: %#v", t)
+}
+
+const (
+	StateSoft = StateType(0)
+	StateHard = StateType(1)
+)
+
+// stateTypes maps all valid StateType values to their SQL representation.
+var stateTypes = map[StateType]string{
+	StateSoft: "soft",
+	StateHard: "hard",
+}
+
+// Assert interface compliance.
+var (
+	_ encoding.TextUnmarshaler = (*StateType)(nil)
+	_ json.Unmarshaler         = (*StateType)(nil)
+	_ driver.Valuer            = StateType(0)
+)