Add query package with first set of conditions and tests

database/query/condition-bool.go

@@ -0,0 +1,64 @@
+package query
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+)
+
+type boolCondition struct {
+	key      string
+	operator uint8
+	value    bool
+}
+
+func newBoolCondition(key string, operator uint8, value interface{}) *boolCondition {
+
+	var parsedValue bool
+
+	switch v := value.(type) {
+	case bool:
+		parsedValue = v
+	case string:
+		var err error
+		parsedValue, err = strconv.ParseBool(v)
+		if err != nil {
+			return &boolCondition{
+				key:      fmt.Sprintf("could not parse \"%s\" to bool: %s", v, err),
+				operator: errorPresent,
+			}
+		}
+	default:
+		return &boolCondition{
+			key:      fmt.Sprintf("incompatible value %v for int64", value),
+			operator: errorPresent,
+		}
+	}
+
+	return &boolCondition{
+		key:      key,
+		operator: operator,
+		value:    parsedValue,
+	}
+}
+
+func (c *boolCondition) complies(f Fetcher) bool {
+	comp, ok := f.GetBool(c.key)
+	if !ok {
+		return false
+	}
+
+	switch c.operator {
+	case Is:
+		return comp == c.value
+	default:
+		return false
+	}
+}
+
+func (c *boolCondition) check() error {
+	if c.operator == errorPresent {
+		return errors.New(c.key)
+	}
+	return nil
+}