org.eclipse.jgit.treewalk
Class WorkingTreeIterator

java.lang.Object
  extended by org.eclipse.jgit.treewalk.AbstractTreeIterator
      extended by 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 getEntryContentLength()
          Get the filtered input length of this entry
 long getEntryLastModified()
          Get the last modified time of this entry.
 long getEntryLength()
          Get the raw byte length of this entry.
 FileMode getIndexFileMode(DirCacheIterator indexIter)
          Get the file mode to use for the current entry when it is to be updated in the index.
 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 isModeDifferent(int rawMode)
          Is the file mode of the current entry different than the given raw mode?
 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, getNameOffset, 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:

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:

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 raw byte length of this entry.

Returns:
size of this file, in bytes.

getEntryContentLength

public long getEntryContentLength()
                           throws IOException
Get the filtered input length of this entry

Returns:
size of the content, in bytes
Throws:
IOException

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.

isModeDifferent

public boolean isModeDifferent(int rawMode)
Is the file mode of the current entry different than the given raw mode?

Parameters:
rawMode -
Returns:
true if different, false otherwise

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.

getIndexFileMode

public FileMode getIndexFileMode(DirCacheIterator indexIter)
Get the file mode to use for the current entry when it is to be updated in the index.

Parameters:
indexIter - DirCacheIterator positioned at the same entry as this iterator or null if no DirCacheIterator is available at this iterator's current entry
Returns:
index file mode


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