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java.lang.Object org.eclipse.jgit.lib.ObjectDatabase
public abstract class ObjectDatabase
Abstraction of arbitrary object storage.
An object database stores one or more Git objects, indexed by their unique
ObjectId
.
Constructor Summary | |
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protected |
ObjectDatabase()
Initialize a new database instance for access. |
Method Summary | |
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abstract void |
close()
Close any resources held by this database. |
void |
create()
Initialize a new object database at this location. |
boolean |
exists()
Does this database exist yet? |
boolean |
has(AnyObjectId objectId)
Does the requested object exist in this database? |
ObjectDatabase |
newCachedDatabase()
Create a new cached database instance over this database. |
abstract ObjectInserter |
newInserter()
Create a new ObjectInserter to insert new objects. |
abstract ObjectReader |
newReader()
Create a new ObjectReader to read existing objects. |
ObjectLoader |
open(AnyObjectId objectId)
Open an object from this database. |
ObjectLoader |
open(AnyObjectId objectId,
int typeHint)
Open an object from this database. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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protected ObjectDatabase()
Method Detail |
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public boolean exists()
create()
to create this database location.public void create() throws IOException
IOException
- the database could not be created.public abstract ObjectInserter newInserter()
ObjectInserter
to insert new objects.
The returned inserter is not itself thread-safe, but multiple concurrent
inserter instances created from the same ObjectDatabase
must be
thread-safe.
public abstract ObjectReader newReader()
ObjectReader
to read existing objects.
The returned reader is not itself thread-safe, but multiple concurrent
reader instances created from the same ObjectDatabase
must be
thread-safe.
public abstract void close()
public boolean has(AnyObjectId objectId) throws IOException
This is a one-shot call interface which may be faster than allocating a
newReader()
to perform the lookup.
objectId
- identity of the object to test for existence of.
IOException
- the object store cannot be accessed.public ObjectLoader open(AnyObjectId objectId) throws IOException
This is a one-shot call interface which may be faster than allocating a
newReader()
to perform the lookup.
objectId
- identity of the object to open.
ObjectLoader
for accessing the object.
MissingObjectException
- the object does not exist.
IOException
- the object store cannot be accessed.public ObjectLoader open(AnyObjectId objectId, int typeHint) throws MissingObjectException, IncorrectObjectTypeException, IOException
This is a one-shot call interface which may be faster than allocating a
newReader()
to perform the lookup.
objectId
- identity of the object to open.typeHint
- hint about the type of object being requested;
ObjectReader.OBJ_ANY
if the object type is not known,
or does not matter to the caller.
ObjectLoader
for accessing the object.
MissingObjectException
- the object does not exist.
IncorrectObjectTypeException
- typeHint was not OBJ_ANY, and the object's actual type does
not match typeHint.
IOException
- the object store cannot be accessed.public ObjectDatabase newCachedDatabase()
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