org.eclipse.jgit.treewalk
Class WorkingTreeIterator

java.lang.Object
  org.eclipse.jgit.treewalk.AbstractTreeIterator
      org.eclipse.jgit.treewalk.WorkingTreeIterator

Direct Known Subclasses:

FileTreeIterator

public abstract class WorkingTreeIterator
extends AbstractTreeIterator

Walks a working directory tree as part of a TreeWalk.

Most applications will want to use the standard implementation of this iterator, FileTreeIterator, as that does all IO through the standard java.io package. Plugins for a Java based IDE may however wish to create their own implementations of this class to allow traversal of the IDE's project space, as well as benefit from any caching the IDE may have.

See Also:

FileTreeIterator

Nested Class Summary

protected static class	WorkingTreeIterator.Entry A single entry within a working directory tree.
static class	WorkingTreeIterator.MetadataDiff The result of a metadata-comparison between the current entry and a DirCacheEntry

Field Summary

protected static WorkingTreeIterator.Entry[]	EOF An empty entry array, suitable for init(Entry[]).
protected Repository	repository Repository that is the root level being iterated over

Fields inherited from class org.eclipse.jgit.treewalk.AbstractTreeIterator

DEFAULT_PATH_SIZE, mode, path, pathLen, pathOffset, zeroid

Constructor Summary

protected	WorkingTreeIterator(String prefix, WorkingTreeOptions options) Create a new iterator with no parent and a prefix.
protected	WorkingTreeIterator(WorkingTreeIterator p) Create an iterator for a subtree of an existing iterator.
protected	WorkingTreeIterator(WorkingTreeOptions options) Create a new iterator with no parent.

Method Summary

void	back(int delta) Move to prior entry, populating this iterator with the entry data.
WorkingTreeIterator.MetadataDiff	compareMetadata(DirCacheEntry entry) Compare the metadata (mode, length, modification-timestamp) of the current entry and a DirCacheEntry
protected WorkingTreeIterator.Entry	current() Obtain the current entry from this iterator.
boolean	eof() Is this tree iterator at its EOF point (no more entries)?
boolean	first() Is this tree iterator positioned on its first entry?
long	getEntryLastModified() Get the last modified time of this entry.
long	getEntryLength() Get the byte length of this entry.
WorkingTreeOptions	getOptions() Returns the working tree options used by this iterator.
boolean	hasId()
byte[]	idBuffer() Get the byte array buffer object IDs must be copied out of.
int	idOffset() Get the position within AbstractTreeIterator.idBuffer() of this entry's ObjectId.
protected byte[]	idSubmodule(File directory, WorkingTreeIterator.Entry e) Get submodule id using the repository at the location of the entry relative to the directory.
protected byte[]	idSubmodule(WorkingTreeIterator.Entry e) Get submodule id for given entry.
protected void	init(WorkingTreeIterator.Entry[] list) Constructor helper.
protected void	initRootIterator(Repository repo) Initialize this iterator for the root level of a repository.
boolean	isEntryIgnored() Determine if the current entry path is ignored by an ignore rule.
protected boolean	isEntryIgnored(int pLen) Determine if the entry path is ignored by an ignore rule.
boolean	isModified(DirCacheEntry entry, boolean forceContentCheck) Checks whether this entry differs from a given entry from the DirCache.
void	next(int delta) Move to next entry, populating this iterator with the entry data.
InputStream	openEntryStream() Obtain an input stream to read the file content.
void	reset() Position this iterator on the first entry.
void	setDirCacheIterator(TreeWalk walk, int treeId) Define the matching DirCacheIterator, to optimize ObjectIds.

Methods inherited from class org.eclipse.jgit.treewalk.AbstractTreeIterator

createEmptyTreeIterator, createSubtreeIterator, createSubtreeIterator, ensurePathCapacity, getEntryFileMode, getEntryObjectId, getEntryObjectId, getEntryPathBuffer, getEntryPathHashCode, getEntryPathLength, getEntryPathString, getEntryRawMode, getName, getNameLength, growPath, idEqual, pathCompare, pathCompare, skip, stopWalk

Methods inherited from class java.lang.Object

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

Field Detail

EOF

protected static final WorkingTreeIterator.Entry[] EOF

An empty entry array, suitable for init(Entry[]).

repository

protected Repository repository

Repository that is the root level being iterated over

Constructor Detail

WorkingTreeIterator

protected WorkingTreeIterator(WorkingTreeOptions options)

Create a new iterator with no parent.

Parameters:

options - working tree options to be used

WorkingTreeIterator

protected WorkingTreeIterator(String prefix,
                              WorkingTreeOptions options)

Create a new iterator with no parent and a prefix.

The prefix path supplied is inserted in front of all paths generated by this iterator. It is intended to be used when an iterator is being created for a subsection of an overall repository and needs to be combined with other iterators that are created to run over the entire repository namespace.

Parameters:

prefix - position of this iterator in the repository tree. The value may be null or the empty string to indicate the prefix is the root of the repository. A trailing slash ('/') is automatically appended if the prefix does not end in '/'.

options - working tree options to be used

WorkingTreeIterator

protected WorkingTreeIterator(WorkingTreeIterator p)

Create an iterator for a subtree of an existing iterator.

Parameters:

p - parent tree iterator.

Method Detail

initRootIterator

protected void initRootIterator(Repository repo)

Initialize this iterator for the root level of a repository.

This method should only be invoked after calling init(Entry[]), and only for the root iterator.

Parameters:

repo - the repository.

setDirCacheIterator

public void setDirCacheIterator(TreeWalk walk,
                                int treeId)

Define the matching DirCacheIterator, to optimize ObjectIds. Once the DirCacheIterator has been set this iterator must only be advanced by the TreeWalk that is supplied, as it assumes that itself and the corresponding DirCacheIterator are positioned on the same file path whenever idBuffer() is invoked.

Parameters:

walk - the walk that will be advancing this iterator.

treeId - index of the matching DirCacheIterator.

hasId

public boolean hasId()

Specified by:

hasId in class AbstractTreeIterator

Returns:

true if the entry has a valid ObjectId.

idBuffer

public byte[] idBuffer()

Description copied from class: AbstractTreeIterator

Get the byte array buffer object IDs must be copied out of.

The id buffer contains the bytes necessary to construct an ObjectId for the current entry of this iterator. The buffer can be the same buffer for all entries, or it can be a unique buffer per-entry. Implementations are encouraged to expose their private buffer whenever possible to reduce garbage generation and copying costs.

Specified by:

idBuffer in class AbstractTreeIterator

Returns:

byte array the implementation stores object IDs within.

See Also:

AbstractTreeIterator.getEntryObjectId()

idSubmodule

protected byte[] idSubmodule(WorkingTreeIterator.Entry e)

Get submodule id for given entry.

Parameters:

e -

Returns:

non-null submodule id

idSubmodule

protected byte[] idSubmodule(File directory,
                             WorkingTreeIterator.Entry e)

Get submodule id using the repository at the location of the entry relative to the directory.

Parameters:

directory -

e -

Returns:

non-null submodule id

getOptions

public WorkingTreeOptions getOptions()

Returns the working tree options used by this iterator.

Returns:

working tree options

idOffset

public int idOffset()

Description copied from class: AbstractTreeIterator

Get the position within AbstractTreeIterator.idBuffer() of this entry's ObjectId.

Specified by:

idOffset in class AbstractTreeIterator

Returns:

offset into the array returned by AbstractTreeIterator.idBuffer() where the ObjectId must be copied out of.

reset

public void reset()

Description copied from class: AbstractTreeIterator

Position this iterator on the first entry. The default implementation of this method uses back(1) until first() is true. This is most likely not the most efficient method of repositioning the iterator to its first entry, so subclasses are strongly encouraged to override the method.

Overrides:

reset in class AbstractTreeIterator

first

public boolean first()

Description copied from class: AbstractTreeIterator

Is this tree iterator positioned on its first entry?

An iterator is positioned on the first entry if back(1) would be an invalid request as there is no entry before the current one.

An empty iterator (one with no entries) will be first() && eof().

Specified by:

first in class AbstractTreeIterator

Returns:

true if the iterator is positioned on the first entry.

eof

public boolean eof()

Description copied from class: AbstractTreeIterator

Is this tree iterator at its EOF point (no more entries)?

An iterator is at EOF if there is no current entry.

Specified by:

eof in class AbstractTreeIterator

Returns:

true if we have walked all entries and have none left.

next

public void next(int delta)
          throws CorruptObjectException

Description copied from class: AbstractTreeIterator

Move to next entry, populating this iterator with the entry data.

The delta indicates how many moves forward should occur. The most common delta is 1 to move to the next entry.

Implementations must populate the following members:

• AbstractTreeIterator.mode
• AbstractTreeIterator.path (from AbstractTreeIterator.pathOffset to AbstractTreeIterator.pathLen)
• AbstractTreeIterator.pathLen

as well as any implementation dependent information necessary to accurately return data from AbstractTreeIterator.idBuffer() and AbstractTreeIterator.idOffset() when demanded.

Specified by:

next in class AbstractTreeIterator

Parameters:

delta - number of entries to move the iterator by. Must be a positive, non-zero integer.

Throws:

CorruptObjectException - the tree is invalid.

back

public void back(int delta)
          throws CorruptObjectException

Description copied from class: AbstractTreeIterator

Move to prior entry, populating this iterator with the entry data.

The delta indicates how many moves backward should occur.The most common delta is 1 to move to the prior entry.

Implementations must populate the following members:

• AbstractTreeIterator.mode
• AbstractTreeIterator.path (from AbstractTreeIterator.pathOffset to AbstractTreeIterator.pathLen)
• AbstractTreeIterator.pathLen

as well as any implementation dependent information necessary to accurately return data from AbstractTreeIterator.idBuffer() and AbstractTreeIterator.idOffset() when demanded.

Specified by:

back in class AbstractTreeIterator

Parameters:

delta - number of entries to move the iterator by. Must be a positive, non-zero integer.

Throws:

CorruptObjectException - the tree is invalid.

getEntryLength

public long getEntryLength()

Get the byte length of this entry.

Returns:

size of this file, in bytes.

getEntryLastModified

public long getEntryLastModified()

Get the last modified time of this entry.

Returns:

last modified time of this file, in milliseconds since the epoch (Jan 1, 1970 UTC).

openEntryStream

public InputStream openEntryStream()
                            throws IOException

Obtain an input stream to read the file content.

Efficient implementations are not required. The caller will usually obtain the stream only once per entry, if at all.

The input stream should not use buffering if the implementation can avoid it. The caller will buffer as necessary to perform efficient block IO operations.

The caller will close the stream once complete.

Returns:

a stream to read from the file.

Throws:

IOException - the file could not be opened for reading.

isEntryIgnored

public boolean isEntryIgnored()
                       throws IOException

Determine if the current entry path is ignored by an ignore rule.

Returns:

true if the entry was ignored by an ignore rule file.

Throws:

IOException - a relevant ignore rule file exists but cannot be read.

isEntryIgnored

protected boolean isEntryIgnored(int pLen)
                          throws IOException

Determine if the entry path is ignored by an ignore rule.

Parameters:

pLen - the length of the path in the path buffer.

Returns:

true if the entry is ignored by an ignore rule.

Throws:

IOException - a relevant ignore rule file exists but cannot be read.

init

protected void init(WorkingTreeIterator.Entry[] list)

Constructor helper.

Parameters:

list - files in the subtree of the work tree this iterator operates on

current

protected WorkingTreeIterator.Entry current()

Obtain the current entry from this iterator.

Returns:

the currently selected entry.

compareMetadata

public WorkingTreeIterator.MetadataDiff compareMetadata(DirCacheEntry entry)

Compare the metadata (mode, length, modification-timestamp) of the current entry and a DirCacheEntry

Parameters:

entry - the DirCacheEntry to compare with

Returns:

a WorkingTreeIterator.MetadataDiff which tells whether and how the entries metadata differ

isModified

public boolean isModified(DirCacheEntry entry,
                          boolean forceContentCheck)

Checks whether this entry differs from a given entry from the DirCache. File status information is used and if status is same we consider the file identical to the state in the working directory. Native git uses more stat fields than we have accessible in Java.

Parameters:

entry - the entry from the dircache we want to compare against

forceContentCheck - True if the actual file content should be checked if modification time differs.

Returns:

true if content is most likely different.