org.eclipse.jgit.lib

Class SymbolicRef

java.lang.Object

org.eclipse.jgit.lib.SymbolicRef

All Implemented Interfaces:

Ref

public class SymbolicRef
extends Object
implements Ref

A reference that indirectly points at another Ref.

A symbolic reference always derives its current value from the target reference.

Nested Class Summary

Nested classes/interfaces inherited from interface org.eclipse.jgit.lib.Ref

Ref.Storage

Field Summary

Fields inherited from interface org.eclipse.jgit.lib.Ref

UNDEFINED_UPDATE_INDEX

Constructor Summary

Constructors

Constructor and Description
SymbolicRef(String refName, Ref target) Create a new ref pairing.
SymbolicRef(String refName, Ref target, long updateIndex) Create a new ref pairing.

Method Summary

Modifier and Type	Method and Description
Ref	getLeaf() Traverse target references until Ref.isSymbolic() is false.
String	getName() What this ref is called within the repository.
ObjectId	getObjectId() Cached value of this ref.
ObjectId	getPeeledObjectId() Cached value of ref^{} (the ref peeled to commit).
Ref.Storage	getStorage() How was this ref obtained?
Ref	getTarget() Get the reference this reference points to, or this.
long	getUpdateIndex() Indicator of the relative order between updates of a specific reference name.
boolean	isPeeled() Whether the Ref represents a peeled tag.
boolean	isSymbolic() Test if this reference is a symbolic reference.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

SymbolicRef

public SymbolicRef(@NonNull
                   String refName,
                   @NonNull
                   Ref target)

Create a new ref pairing.

Parameters:

refName - name of this ref.

target - the ref we reference and derive our value from.

SymbolicRef

public SymbolicRef(@NonNull
                   String refName,
                   @NonNull
                   Ref target,
                   long updateIndex)

Create a new ref pairing.

Parameters:

refName - name of this ref.

target - the ref we reference and derive our value from.

updateIndex - index that increases with each update of the reference

Since:

5.3

Method Detail

getName

@NonNull
public String getName()

What this ref is called within the repository.

Specified by:

getName in interface Ref

Returns:

name of this ref.

isSymbolic

public boolean isSymbolic()

Test if this reference is a symbolic reference.

A symbolic reference does not have its own ObjectId value, but instead points to another Ref in the same database and always uses that other reference's value as its own.

Specified by:

isSymbolic in interface Ref

Returns:

true if this is a symbolic reference; false if this reference contains its own ObjectId.

getLeaf

@NonNull
public Ref getLeaf()

Traverse target references until Ref.isSymbolic() is false.

If Ref.isSymbolic() is false, returns this.

If Ref.isSymbolic() is true, this method recursively traverses Ref.getTarget() until Ref.isSymbolic() returns false.

This method is effectively

 return isSymbolic() ? getTarget().getLeaf() : this;
 

Specified by:

getLeaf in interface Ref

Returns:

the reference that actually stores the ObjectId value.

getTarget

@NonNull
public Ref getTarget()

Get the reference this reference points to, or this.

If Ref.isSymbolic() is true this method returns the reference it directly names, which might not be the leaf reference, but could be another symbolic reference.

If this is a leaf level reference that contains its own ObjectId,this method returns this.

Specified by:

getTarget in interface Ref

Returns:

the target reference, or this.

getObjectId

@Nullable
public ObjectId getObjectId()

Cached value of this ref.

Specified by:

getObjectId in interface Ref

Returns:

the value of this ref at the last time we read it. May be null to indicate a ref that does not exist yet or a symbolic ref pointing to an unborn branch.

getStorage

@NonNull
public Ref.Storage getStorage()

How was this ref obtained?

The current storage model of a Ref may influence how the ref must be updated or deleted from the repository.

Specified by:

getStorage in interface Ref

Returns:

type of ref.

getPeeledObjectId

@Nullable
public ObjectId getPeeledObjectId()

Cached value of ref^{} (the ref peeled to commit).

Specified by:

getPeeledObjectId in interface Ref

Returns:

if this ref is an annotated tag the id of the commit (or tree or blob) that the annotated tag refers to; null if this ref does not refer to an annotated tag.

isPeeled

public boolean isPeeled()

Whether the Ref represents a peeled tag.

Specified by:

isPeeled in interface Ref

Returns:

whether the Ref represents a peeled tag.

getUpdateIndex

public long getUpdateIndex()

Indicator of the relative order between updates of a specific reference name. A number that increases when a reference is updated.

With symbolic references, the update index refers to updates of the symbolic reference itself. For example, if HEAD points to refs/heads/master, then the update index for exactRef("HEAD") will only increase when HEAD changes to point to another ref, regardless of how many times refs/heads/master is updated.

Should not be used unless the RefDatabase that instantiated the ref supports versioning (see RefDatabase.hasVersioning())

Specified by:

getUpdateIndex in interface Ref

Returns:

the update index (i.e. version) of this reference.

Since:

5.3

toString

public String toString()

Overrides:

toString in class Object