Class AbstractTreeIterator
- java.lang.Object
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- org.eclipse.jgit.treewalk.AbstractTreeIterator
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- Direct Known Subclasses:
CanonicalTreeParser
,DirCacheIterator
,EmptyTreeIterator
,WorkingTreeIterator
public abstract class AbstractTreeIterator extends Object
Walks a Git tree (directory) in Git sort order.A new iterator instance should be positioned on the first entry, or at eof. Data for the first entry (if not at eof) should be available immediately.
Implementors must walk a tree in the Git sort order, which has the following odd sorting:
- A.c
- A/c
- A0c
In the second item,
A
is the name of a subtree andc
is a file within that subtree. The other two items are files in the root level tree.- See Also:
CanonicalTreeParser
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Field Summary
Fields Modifier and Type Field Description protected AttributesNode
attributesNode
Parsed rules of .gitattributes file if it exists.protected static int
DEFAULT_PATH_SIZE
Default size for thepath
buffer.protected int
mode
Mode bits for the current entry.AbstractTreeIterator
parent
Iterator for the parent tree; null if we are the root iterator.protected byte[]
path
Path buffer for the current entry.protected int
pathLen
Total length of the current entry's complete path from the root.protected int
pathOffset
Position withinpath
this iterator starts writing at.protected static byte[]
zeroid
A dummy object id buffer that matches the zero ObjectId.
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Constructor Summary
Constructors Modifier Constructor Description protected
AbstractTreeIterator()
Create a new iterator with no parent.protected
AbstractTreeIterator(byte[] prefix)
Create a new iterator with no parent and a prefix.protected
AbstractTreeIterator(String prefix)
Create a new iterator with no parent and a prefix.protected
AbstractTreeIterator(AbstractTreeIterator p)
Create an iterator for a subtree of an existing iterator.protected
AbstractTreeIterator(AbstractTreeIterator p, byte[] childPath, int childPathOffset)
Create an iterator for a subtree of an existing iterator.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description abstract void
back(int delta)
Move to prior entry, populating this iterator with the entry data.EmptyTreeIterator
createEmptyTreeIterator()
Create a new iterator as though the current entry were a subtree.abstract AbstractTreeIterator
createSubtreeIterator(ObjectReader reader)
Create a new iterator for the current entry's subtree.AbstractTreeIterator
createSubtreeIterator(ObjectReader reader, MutableObjectId idBuffer)
Create a new iterator for the current entry's subtree.protected void
ensurePathCapacity(int capacity, int len)
Ensure that path is capable to hold at leastcapacity
bytesabstract boolean
eof()
Is this tree iterator at its EOF point (no more entries)?boolean
findFile(byte[] name)
Seek the iterator on a file, if present.boolean
findFile(String name)
Seek the iterator on a file, if present.abstract boolean
first()
Is this tree iterator positioned on its first entry?FileMode
getEntryFileMode()
Get the file mode of the current entry.ObjectId
getEntryObjectId()
Get the object id of the current entry.void
getEntryObjectId(MutableObjectId out)
Obtain the ObjectId for the current entry.byte[]
getEntryPathBuffer()
Get the current entry path buffer.int
getEntryPathHashCode()
Get the current entry's path hash code.int
getEntryPathLength()
Get length of the path ingetEntryPathBuffer()
.String
getEntryPathString()
Get path of the current entry, as a string.int
getEntryRawMode()
Get the file mode of the current entry as bits.void
getName(byte[] buffer, int offset)
Get the name component of the current entry path into the provided buffer.int
getNameLength()
Get the length of the name component of the path for the current entry.int
getNameOffset()
JGit internal API for use byDirCacheCheckout
protected void
growPath(int len)
Grow the path buffer larger.abstract boolean
hasId()
Whether the entry has a valid ObjectId.abstract byte[]
idBuffer()
Get the byte array buffer object IDs must be copied out of.boolean
idEqual(AbstractTreeIterator otherIterator)
Check if the current entry of both iterators has the same id.abstract int
idOffset()
Get the position withinidBuffer()
of this entry's ObjectId.boolean
isWorkTree()
Whether or not this Iterator is iterating through the working tree.protected boolean
needsStopWalk()
Whether the iterator implementsstopWalk()
.abstract void
next(int delta)
Move to next entry, populating this iterator with the entry data.int
pathCompare(byte[] buf, int pos, int end, int pathMode)
Compare the path of this current entry to a raw buffer.int
pathCompare(AbstractTreeIterator p)
Compare the path of this current entry to another iterator's entry.void
reset()
Position this iterator on the first entry.void
skip()
Advance to the next tree entry, populating this iterator with its data.void
stopWalk()
Indicates to the iterator that no more entries will be read.String
toString()
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Field Detail
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DEFAULT_PATH_SIZE
protected static final int DEFAULT_PATH_SIZE
Default size for thepath
buffer.- See Also:
- Constant Field Values
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zeroid
protected static final byte[] zeroid
A dummy object id buffer that matches the zero ObjectId.
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parent
public final AbstractTreeIterator parent
Iterator for the parent tree; null if we are the root iterator.Used by
TreeWalk
andAttributesHandler
- Since:
- 4.3
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attributesNode
protected AttributesNode attributesNode
Parsed rules of .gitattributes file if it exists.- Since:
- 4.2
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mode
protected int mode
Mode bits for the current entry.A numerical value from FileMode is usually faster for an iterator to obtain from its data source so this is the preferred representation.
- See Also:
FileMode
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path
protected byte[] path
Path buffer for the current entry.This buffer is pre-allocated at the start of walking and is shared from parent iterators down into their subtree iterators. The sharing allows the current entry to always be a full path from the root, while each subtree only needs to populate the part that is under their control.
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pathOffset
protected final int pathOffset
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pathLen
protected int pathLen
Total length of the current entry's complete path from the root.This is the number of bytes within
path
that pertain to the current entry. Values at this index through the end of the array are garbage and may be randomly populated from prior entries.
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Constructor Detail
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AbstractTreeIterator
protected AbstractTreeIterator()
Create a new iterator with no parent.
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AbstractTreeIterator
protected AbstractTreeIterator(String prefix)
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 '/'.
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AbstractTreeIterator
protected AbstractTreeIterator(byte[] prefix)
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 array to indicate the prefix is the root of the repository. A trailing slash ('/') is automatically appended if the prefix does not end in '/'.
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AbstractTreeIterator
protected AbstractTreeIterator(AbstractTreeIterator p)
Create an iterator for a subtree of an existing iterator.- Parameters:
p
- parent tree iterator.
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AbstractTreeIterator
protected AbstractTreeIterator(AbstractTreeIterator p, byte[] childPath, int childPathOffset)
Create an iterator for a subtree of an existing iterator.The caller is responsible for setting up the path of the child iterator.
- Parameters:
p
- parent tree iterator.childPath
- path array to be used by the child iterator. This path must contain the path from the top of the walk to the first child and must end with a '/'.childPathOffset
- position withinchildPath
where the child can insert its data. The value atchildPath[childPathOffset-1]
must be '/'.
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Method Detail
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growPath
protected void growPath(int len)
Grow the path buffer larger.- Parameters:
len
- number of live bytes in the path buffer. This many bytes will be moved into the larger buffer.
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ensurePathCapacity
protected void ensurePathCapacity(int capacity, int len)
Ensure that path is capable to hold at leastcapacity
bytes- Parameters:
capacity
- the amount of bytes to holdlen
- the amount of live bytes in path buffer
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pathCompare
public int pathCompare(AbstractTreeIterator p)
Compare the path of this current entry to another iterator's entry.- Parameters:
p
- the other iterator to compare the path against.- Returns:
- -1 if this entry sorts first; 0 if the entries are equal; 1 if p's entry sorts first.
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findFile
public boolean findFile(String name) throws CorruptObjectException
Seek the iterator on a file, if present.- Parameters:
name
- file name to find (will not find a directory).- Returns:
- true if the file exists in this tree; false otherwise.
- Throws:
CorruptObjectException
- tree is invalid.- Since:
- 4.2
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findFile
public boolean findFile(byte[] name) throws CorruptObjectException
Seek the iterator on a file, if present.- Parameters:
name
- file name to find (will not find a directory).- Returns:
- true if the file exists in this tree; false otherwise.
- Throws:
CorruptObjectException
- tree is invalid.- Since:
- 4.2
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pathCompare
public int pathCompare(byte[] buf, int pos, int end, int pathMode)
Compare the path of this current entry to a raw buffer.- Parameters:
buf
- the raw path buffer.pos
- position to start reading the raw buffer.end
- one past the end of the raw buffer (length is end - pos).pathMode
- the mode of the path.- Returns:
- -1 if this entry sorts first; 0 if the entries are equal; 1 if p's entry sorts first.
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idEqual
public boolean idEqual(AbstractTreeIterator otherIterator)
Check if the current entry of both iterators has the same id.This method is faster than
getEntryObjectId()
as it does not require copying the bytes out of the buffers. A directidBuffer()
compare operation is performed.- Parameters:
otherIterator
- the other iterator to test against.- Returns:
- true if both iterators have the same object id; false otherwise.
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hasId
public abstract boolean hasId()
Whether the entry has a valid ObjectId.- Returns:
true
if the entry has a valid ObjectId.
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getEntryObjectId
public ObjectId getEntryObjectId()
Get the object id of the current entry.- Returns:
- an object id for the current entry.
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getEntryObjectId
public void getEntryObjectId(MutableObjectId out)
Obtain the ObjectId for the current entry.- Parameters:
out
- buffer to copy the object id into.
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getEntryFileMode
public FileMode getEntryFileMode()
Get the file mode of the current entry.- Returns:
- the file mode of the current entry.
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getEntryRawMode
public int getEntryRawMode()
Get the file mode of the current entry as bits.- Returns:
- the file mode of the current entry as bits.
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getEntryPathString
public String getEntryPathString()
Get path of the current entry, as a string.- Returns:
- path of the current entry, as a string.
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getEntryPathBuffer
public byte[] getEntryPathBuffer()
Get the current entry path buffer.Note that the returned byte[] has to be used together with
getEntryPathLength()
(only use bytes up to this length).- Returns:
- the internal buffer holding the current path.
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getEntryPathLength
public int getEntryPathLength()
Get length of the path ingetEntryPathBuffer()
.- Returns:
- length of the path in
getEntryPathBuffer()
.
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getEntryPathHashCode
public int getEntryPathHashCode()
Get the current entry's path hash code.This method computes a hash code on the fly for this path, the hash is suitable to cluster objects that may have similar paths together.
- Returns:
- path hash code; any integer may be returned.
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idBuffer
public abstract byte[] idBuffer()
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.
- Returns:
- byte array the implementation stores object IDs within.
- See Also:
getEntryObjectId()
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idOffset
public abstract int idOffset()
Get the position withinidBuffer()
of this entry's ObjectId.- Returns:
- offset into the array returned by
idBuffer()
where the ObjectId must be copied out of.
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createSubtreeIterator
public abstract AbstractTreeIterator createSubtreeIterator(ObjectReader reader) throws IncorrectObjectTypeException, IOException
Create a new iterator for the current entry's subtree.The parent reference of the iterator must be
this
, otherwise the caller would not be able to exit out of the subtree iterator correctly and return to continue walkingthis
.- Parameters:
reader
- reader to load the tree data from.- Returns:
- a new parser that walks over the current subtree.
- Throws:
IncorrectObjectTypeException
- the current entry is not actually a tree and cannot be parsed as though it were a tree.IOException
- a loose object or pack file could not be read.
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createEmptyTreeIterator
public EmptyTreeIterator createEmptyTreeIterator()
Create a new iterator as though the current entry were a subtree.- Returns:
- a new empty tree iterator.
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createSubtreeIterator
public AbstractTreeIterator createSubtreeIterator(ObjectReader reader, MutableObjectId idBuffer) throws IncorrectObjectTypeException, IOException
Create a new iterator for the current entry's subtree.The parent reference of the iterator must be
this
, otherwise the caller would not be able to exit out of the subtree iterator correctly and return to continue walkingthis
.- Parameters:
reader
- reader to load the tree data from.idBuffer
- temporary ObjectId buffer for use by this method.- Returns:
- a new parser that walks over the current subtree.
- Throws:
IncorrectObjectTypeException
- the current entry is not actually a tree and cannot be parsed as though it were a tree.IOException
- a loose object or pack file could not be read.
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reset
public void reset() throws CorruptObjectException
Position this iterator on the first entry. The default implementation of this method usesback(1)
untilfirst()
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.- Throws:
CorruptObjectException
- the tree is invalid.
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first
public abstract boolean first()
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()
.- Returns:
- true if the iterator is positioned on the first entry.
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eof
public abstract boolean eof()
Is this tree iterator at its EOF point (no more entries)?An iterator is at EOF if there is no current entry.
- Returns:
- true if we have walked all entries and have none left.
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next
public abstract void next(int delta) throws CorruptObjectException
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:
mode
path
(frompathOffset
topathLen
)pathLen
idBuffer()
andidOffset()
when demanded.- Parameters:
delta
- number of entries to move the iterator by. Must be a positive, non-zero integer.- Throws:
CorruptObjectException
- the tree is invalid.
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back
public abstract void back(int delta) throws CorruptObjectException
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:
mode
path
(frompathOffset
topathLen
)pathLen
idBuffer()
andidOffset()
when demanded.- Parameters:
delta
- number of entries to move the iterator by. Must be a positive, non-zero integer.- Throws:
CorruptObjectException
- the tree is invalid.
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skip
public void skip() throws CorruptObjectException
Advance to the next tree entry, populating this iterator with its data.This method behaves like
seek(1)
but is called byTreeWalk
only if aTreeFilter
was used and ruled out the current entry from the results. In such cases this tree iterator may perform special behavior.- Throws:
CorruptObjectException
- the tree is invalid.
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stopWalk
public void stopWalk()
Indicates to the iterator that no more entries will be read.This is only invoked by TreeWalk when the iteration is aborted early due to a
StopWalkException
being thrown from within a TreeFilter.
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needsStopWalk
protected boolean needsStopWalk()
Whether the iterator implementsstopWalk()
.- Returns:
true
if the iterator implementsstopWalk()
.- Since:
- 4.2
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getNameLength
public int getNameLength()
Get the length of the name component of the path for the current entry.- Returns:
- the length of the name component of the path for the current entry.
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getNameOffset
public int getNameOffset()
JGit internal API for use byDirCacheCheckout
- Returns:
- start of name component part within
getEntryPathBuffer()
- Since:
- 2.0
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getName
public void getName(byte[] buffer, int offset)
Get the name component of the current entry path into the provided buffer.- Parameters:
buffer
- the buffer to get the name into, it is assumed that buffer can hold the nameoffset
- the offset of the name in the buffer- See Also:
getNameLength()
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isWorkTree
public boolean isWorkTree()
Whether or not this Iterator is iterating through the working tree.- Returns:
- whether or not this Iterator is iterating through the working tree
- Since:
- 4.3
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