1 files changed, 107 insertions, 0 deletions
diff --git a/gerrit/changeset.go b/gerrit/changeset.go
new file mode 100644
index 000000000000..38a489ec7dd9
--- /dev/null
+++ b/gerrit/changeset.go
@@ -0,0 +1,107 @@
+package gerrit
+
+import (
+	"bytes"
+	"fmt"
+
+	goGerrit "github.com/andygrunwald/go-gerrit"
+	log "github.com/sirupsen/logrus"
+)
+
+// Changeset represents a single changeset
+// Relationships between different changesets are described in Series
+type Changeset struct {
+	changeInfo      *goGerrit.ChangeInfo
+	ChangeID        string
+	Number          int
+	IsVerified      bool
+	IsCodeReviewed  bool
+	HashTags        []string
+	CommitID        string
+	ParentCommitIDs []string
+	OwnerName       string
+	Subject         string
+}
+
+// MakeChangeset creates a new Changeset object out of a goGerrit.ChangeInfo object
+func MakeChangeset(changeInfo *goGerrit.ChangeInfo) *Changeset {
+	return &Changeset{
+		changeInfo:      changeInfo,
+		ChangeID:        changeInfo.ChangeID,
+		Number:          changeInfo.Number,
+		IsVerified:      isVerified(changeInfo),
+		IsCodeReviewed:  isCodeReviewed(changeInfo),
+		HashTags:        changeInfo.Hashtags,
+		CommitID:        changeInfo.CurrentRevision, // yes, this IS the commit ID.
+		ParentCommitIDs: getParentCommitIDs(changeInfo),
+		OwnerName:       changeInfo.Owner.Name,
+		Subject:         changeInfo.Subject,
+	}
+}
+
+// MakeMockChangeset creates a mock changeset
+// func MakeMockChangeset(isVerified, IsCodeReviewed bool, hashTags []string, commitID string, parentCommitIDs []string, ownerName, subject string) *Changeset {
+// 	//TODO impl
+// 	return nil
+//}
+
+// HasTag returns true if a Changeset has the given tag.
+func (c *Changeset) HasTag(tag string) bool {
+	hashTags := c.HashTags
+	for _, hashTag := range hashTags {
+		if hashTag == tag {
+			return true
+		}
+	}
+	return false
+}
+
+func (c *Changeset) String() string {
+	var b bytes.Buffer
+	b.WriteString("Changeset")
+	b.WriteString(fmt.Sprintf("(commitID: %.7s, author: %s, subject: %s)", c.CommitID, c.OwnerName, c.Subject))
+	return b.String()
+}
+
+// FilterChangesets filters a list of Changeset by a given filter function
+func FilterChangesets(changesets []*Changeset, f func(*Changeset) bool) []*Changeset {
+	newChangesets := make([]*Changeset, 0)
+	for _, changeset := range changesets {
+		if f(changeset) {
+			newChangesets = append(newChangesets, changeset)
+		} else {
+			log.WithField("changeset", changeset.String()).Debug("dropped by filter")
+		}
+	}
+	return newChangesets
+}
+
+// isVerified returns true if the code passed CI,
+// that's when somebody left the Approved (+1) on the "Verified" label
+func isVerified(changeInfo *goGerrit.ChangeInfo) bool {
+	labels := changeInfo.Labels
+	return labels["Verified"].Approved.AccountID != 0
+}
+
+// isCodeReviewed returns true if the code passed code review,
+// that's when somebody left the Recommended (+2) on the "Code-Review" label
+func isCodeReviewed(changeInfo *goGerrit.ChangeInfo) bool {
+	labels := changeInfo.Labels
+	return labels["Code-Review"].Recommended.AccountID != 0
+}
+
+// getParentCommitIDs returns the parent commit IDs of the goGerrit.ChangeInfo
+// There is usually only one parent commit ID, except for merge commits.
+func getParentCommitIDs(changeInfo *goGerrit.ChangeInfo) []string {
+	// obtain the RevisionInfo object
+	revisionInfo := changeInfo.Revisions[changeInfo.CurrentRevision]
+
+	// obtain the Commit object
+	commit := revisionInfo.Commit
+
+	commitIDs := make([]string, len(commit.Parents))
+	for i, commit := range commit.Parents {
+		commitIDs[i] = commit.Commit
+	}
+	return commitIDs
+}