org.eclipse.jgit.merge
Class Merger

java.lang.Object
  org.eclipse.jgit.merge.Merger

Direct Known Subclasses:

ThreeWayMerger

public abstract class Merger
extends Object

Instance of a specific MergeStrategy for a single Repository.

Field Summary

protected Repository	db The repository this merger operates on.
protected ObjectReader	reader Reader to support walk and other object loading.
protected RevCommit[]	sourceCommits If sourceObjects[i] is a commit, this is the commit.
protected RevObject[]	sourceObjects The original objects supplied in the merge; this can be any tree-ish.
protected RevTree[]	sourceTrees The trees matching every entry in sourceObjects.
protected RevWalk	walk A RevWalk for computing merge bases, or listing incoming commits.

Constructor Summary

protected

Merger(Repository local) Create a new merge instance for a repository.

Method Summary

RevCommit	getBaseCommit(int aIdx, int bIdx) Return the merge base of two commits.
ObjectInserter	getObjectInserter()
Repository	getRepository()
abstract ObjectId	getResultTreeId()
boolean	merge(AnyObjectId... tips) Merge together two or more tree-ish objects.
protected AbstractTreeIterator	mergeBase(int aIdx, int bIdx) Create an iterator to walk the merge base of two commits.
protected abstract boolean	mergeImpl() Execute the merge.
protected AbstractTreeIterator	openTree(AnyObjectId treeId) Open an iterator over a tree.
void	setObjectInserter(ObjectInserter oi) Set the inserter this merger will use to create objects.

Methods inherited from class java.lang.Object

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

Field Detail

db

protected final Repository db

The repository this merger operates on.

reader

protected final ObjectReader reader

Reader to support walk and other object loading.

walk

protected final RevWalk walk

A RevWalk for computing merge bases, or listing incoming commits.

sourceObjects

protected RevObject[] sourceObjects

The original objects supplied in the merge; this can be any tree-ish.

sourceCommits

protected RevCommit[] sourceCommits

If sourceObjects[i] is a commit, this is the commit.

sourceTrees

protected RevTree[] sourceTrees

The trees matching every entry in sourceObjects.

Constructor Detail

Merger

protected Merger(Repository local)

Create a new merge instance for a repository.

Parameters:

local - the repository this merger will read and write data on.

Method Detail

getRepository

public Repository getRepository()

Returns:

the repository this merger operates on.

getObjectInserter

public ObjectInserter getObjectInserter()

Returns:

an object writer to create objects in getRepository(). If no inserter has been set on this instance, one will be created and returned by all future calls.

setObjectInserter

public void setObjectInserter(ObjectInserter oi)

Set the inserter this merger will use to create objects.

If an inserter was already set on this instance (such as by a prior set, or a prior call to getObjectInserter()), the prior inserter will be released first.

Parameters:

oi - the inserter instance to use. Must be associated with the repository instance returned by getRepository().

merge

public boolean merge(AnyObjectId... tips)
              throws IOException

Merge together two or more tree-ish objects.

Any tree-ish may be supplied as inputs. Commits and/or tags pointing at trees or commits may be passed as input objects.

Parameters:

tips - source trees to be combined together. The merge base is not included in this set.

Returns:

true if the merge was completed without conflicts; false if the merge strategy cannot handle this merge or there were conflicts preventing it from automatically resolving all paths.

Throws:

IncorrectObjectTypeException - one of the input objects is not a commit, but the strategy requires it to be a commit.

IOException - one or more sources could not be read, or outputs could not be written to the Repository.

mergeBase

protected AbstractTreeIterator mergeBase(int aIdx,
                                         int bIdx)
                                  throws IOException

Create an iterator to walk the merge base of two commits.

Parameters:

aIdx - index of the first commit in sourceObjects.

bIdx - index of the second commit in sourceObjects.

Returns:

the new iterator

Throws:

IncorrectObjectTypeException - one of the input objects is not a commit.

IOException - objects are missing or multiple merge bases were found.

getBaseCommit

public RevCommit getBaseCommit(int aIdx,
                               int bIdx)
                        throws IncorrectObjectTypeException,
                               IOException

Return the merge base of two commits.

Parameters:

aIdx - index of the first commit in sourceObjects.

bIdx - index of the second commit in sourceObjects.

Returns:

the merge base of two commits

Throws:

IncorrectObjectTypeException - one of the input objects is not a commit.

IOException - objects are missing or multiple merge bases were found.

openTree

protected AbstractTreeIterator openTree(AnyObjectId treeId)
                                 throws IncorrectObjectTypeException,
                                        IOException

Open an iterator over a tree.

Parameters:

treeId - the tree to scan; must be a tree (not a treeish).

Returns:

an iterator for the tree.

Throws:

IncorrectObjectTypeException - the input object is not a tree.

IOException - the tree object is not found or cannot be read.

mergeImpl

protected abstract boolean mergeImpl()
                              throws IOException

Execute the merge.

This method is called from merge(AnyObjectId[]) after the sourceObjects, sourceCommits and sourceTrees have been populated.

Returns:

true if the merge was completed without conflicts; false if the merge strategy cannot handle this merge or there were conflicts preventing it from automatically resolving all paths.

Throws:

IncorrectObjectTypeException - one of the input objects is not a commit, but the strategy requires it to be a commit.

IOException - one or more sources could not be read, or outputs could not be written to the Repository.

getResultTreeId

public abstract ObjectId getResultTreeId()

Returns:

resulting tree, if merge(AnyObjectId[]) returned true.