Package org.apache.jackrabbit.core.version

Class LabelVersionSelector

java.lang.Object

org.apache.jackrabbit.core.version.LabelVersionSelector

All Implemented Interfaces:

VersionSelector

public class LabelVersionSelector
extends Object
implements VersionSelector

This Class implements a version selector that selects a version by label.

 V1.0
 V1.1 - "foo"

 new LabelVersionSelector("foo").select() --> V1.1
 new LabelVersionSelector("bar").select() --> null

 

Constructor Summary

Constructors

Constructor	Description
LabelVersionSelector(Name label)	Creates a LabelVersionSelector that will try to select a version with the given label.

Method Summary

Modifier and Type	Method	Description
Name	getLabel()	Returns the label hint
InternalVersion	select(InternalVersionHistory versionHistory)	Selects a version of the given version history.
static InternalVersion	selectByLabel(InternalVersionHistory history, Name label)	Selects a version by label
void	setLabel(Name label)	Sets the label hint
String	toString()	returns debug information

Methods inherited from class java.lang.Object

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

Constructor Detail

LabelVersionSelector

public LabelVersionSelector(Name label)

Creates a LabelVersionSelector that will try to select a version with the given label.

Parameters:

label - label hint

Method Detail

getLabel

public Name getLabel()

Returns the label hint

Returns:

the label hint.

setLabel

public void setLabel(Name label)

Sets the label hint

Parameters:

label - label hint

select

public InternalVersion select(InternalVersionHistory versionHistory)
                       throws RepositoryException

Selects a version of the given version history. If this VersionSelector is unable to select one, it can return null. Please note, that a version selector is not allowed to return the root version. Selects a version from the given version history using the previously assigned hint in the following order: name, label, date, latest.

Specified by:

select in interface VersionSelector

Parameters:

versionHistory - version history to select a version from

Returns:

A version or null.

Throws:

RepositoryException - if an error occurs.

selectByLabel

public static InternalVersion selectByLabel(InternalVersionHistory history,
                                            Name label)
                                     throws RepositoryException

Selects a version by label

Parameters:

history - history to select from

label - desired label

Returns:

the version with the given label or null

Throws:

RepositoryException - if an error occurs

toString

public String toString()

returns debug information

Overrides:

toString in class Object

Returns:

debug information