Package com.google.gerrit.server.git

Class GroupCollector

java.lang.Object

com.google.gerrit.server.git.GroupCollector

public class GroupCollector
extends Object

Helper for assigning groups to commits during ReceiveCommits.

For each commit encountered along a walk between the branch tip and the tip of the push, the group of a commit is defined as follows:

• If the commit is an existing patch set of a change, the group is read from the group field in the corresponding PatchSet record.
• If all of a commit's parents are merged into the branch, then its group is its own SHA-1.
• If the commit has a single parent that is not yet merged into the branch, then its group is the same as the parent's group.
• For a merge commit, choose a parent and use that parent's group. If one of the parents has a group from a patch set, use that group, otherwise, use the group from the first parent. In addition to setting this merge commit's group, use the chosen group for all commits that would otherwise use a group from the parents that were not chosen.
• If a merge commit has multiple parents whose group comes from separate patch sets, concatenate the groups from those parents together. This indicates two side branches were pushed separately, followed by the merge.

Callers must call visit(RevCommit) on all commits between the current branch tip and the tip of a push, in reverse topo order (parents before children). Once all commits have been visited, call getGroups() for the result.

Method Summary

Modifier and Type	Method	Description
static GroupCollector	create(com.google.gerrit.server.git.receive.ReceivePackRefCache receivePackRefCache, PatchSetUtil psUtil, ChangeNotes.Factory notesFactory, Project.NameKey project)	Returns a new GroupCollector instance.
static List<String>	getDefaultGroups(org.eclipse.jgit.lib.ObjectId commit)
com.google.common.collect.SortedSetMultimap<org.eclipse.jgit.lib.ObjectId,String>	getGroups()	Returns the groups that got collected from visiting commits using visit(RevCommit).
static List<String>	getGroups(RevisionResource rsrc)
void	visit(org.eclipse.jgit.revwalk.RevCommit c)	Process the given RevCommit.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getDefaultGroups

public static List<String> getDefaultGroups(org.eclipse.jgit.lib.ObjectId commit)

getGroups

public static List<String> getGroups(RevisionResource rsrc)

create

public static GroupCollector create(com.google.gerrit.server.git.receive.ReceivePackRefCache receivePackRefCache,
                                    PatchSetUtil psUtil,
                                    ChangeNotes.Factory notesFactory,
                                    Project.NameKey project)

Returns a new GroupCollector instance.

See Also:

for what this class does.

visit

public void visit(org.eclipse.jgit.revwalk.RevCommit c)
           throws IOException

Process the given RevCommit. Callers must call visit(RevCommit) on all commits between the current branch tip and the tip of a push, in reverse topo order (parents before children). Once all commits have been visited, call getGroups() for the result.

Throws:

IOException

See Also:

for what this class does.

getGroups

public com.google.common.collect.SortedSetMultimap<org.eclipse.jgit.lib.ObjectId,String> getGroups()
                                                                                                  throws IOException

Returns the groups that got collected from visiting commits using visit(RevCommit).

Throws:

IOException