Update util for experiment in v1alpha2 (kubeflow#485)

* Update util for experiment

* Change GetLastConditionType func

* Add empty condition check

pkg/api/operators/apis/experiment/v1alpha2/util.go

@@ -16,6 +16,8 @@ limitations under the License.
 package v1alpha2
 
 import (
+	"errors"
+
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
@@ -73,10 +75,25 @@ func (exp *Experiment) IsFailed() bool {
 	return hasCondition(exp, ExperimentFailed)
 }
 
+func (exp *Experiment) IsRunning() bool {
+	return hasCondition(exp, ExperimentRunning)
+}
+
+func (exp *Experiment) IsRestarting() bool {
+	return hasCondition(exp, ExperimentRestarting)
+}
+
 func (exp *Experiment) IsCompleted() bool {
 	return exp.IsSucceeded() || exp.IsFailed()
 }
 
+func (exp *Experiment) GetLastConditionType() (ExperimentConditionType, error) {
+	if len(exp.Status.Conditions) > 0 {
+		return exp.Status.Conditions[len(exp.Status.Conditions)-1].Type, nil
+	}
+	return "", errors.New("Experiment doesn't have any condition")
+}
+
 func (exp *Experiment) setCondition(conditionType ExperimentConditionType, status v1.ConditionStatus, reason, message string) {
 
 	newCond := newCondition(conditionType, status, reason, message)