RevCommitList.java
/*
* Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.revwalk;
import java.io.IOException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.revwalk.filter.RevFilter;
/**
* An ordered list of {@link org.eclipse.jgit.revwalk.RevCommit} subclasses.
*
* @param <E>
* type of subclass of RevCommit the list is storing.
*/
public class RevCommitList<E extends RevCommit> extends RevObjectList<E> {
private RevWalk walker;
/** {@inheritDoc} */
@Override
public void clear() {
super.clear();
walker = null;
}
/**
* Apply a flag to all commits matching the specified filter.
* <p>
* Same as <code>applyFlag(matching, flag, 0, size())</code>, but without
* the incremental behavior.
*
* @param matching
* the filter to test commits with. If the filter includes a
* commit it will have the flag set; if the filter does not
* include the commit the flag will be unset.
* @param flag
* the flag to apply (or remove). Applications are responsible
* for allocating this flag from the source RevWalk.
* @throws java.io.IOException
* revision filter needed to read additional objects, but an
* error occurred while reading the pack files or loose objects
* of the repository.
* @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
* revision filter needed to read additional objects, but an
* object was not of the correct type. Repository corruption may
* have occurred.
* @throws org.eclipse.jgit.errors.MissingObjectException
* revision filter needed to read additional objects, but an
* object that should be present was not found. Repository
* corruption may have occurred.
*/
public void applyFlag(RevFilter matching, RevFlag flag)
throws MissingObjectException, IncorrectObjectTypeException,
IOException {
applyFlag(matching, flag, 0, size());
}
/**
* Apply a flag to all commits matching the specified filter.
* <p>
* This version allows incremental testing and application, such as from a
* background thread that needs to periodically halt processing and send
* updates to the UI.
*
* @param matching
* the filter to test commits with. If the filter includes a
* commit it will have the flag set; if the filter does not
* include the commit the flag will be unset.
* @param flag
* the flag to apply (or remove). Applications are responsible
* for allocating this flag from the source RevWalk.
* @param rangeBegin
* first commit within the list to begin testing at, inclusive.
* Must not be negative, but may be beyond the end of the list.
* @param rangeEnd
* last commit within the list to end testing at, exclusive. If
* smaller than or equal to <code>rangeBegin</code> then no
* commits will be tested.
* @throws java.io.IOException
* revision filter needed to read additional objects, but an
* error occurred while reading the pack files or loose objects
* of the repository.
* @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
* revision filter needed to read additional objects, but an
* object was not of the correct type. Repository corruption may
* have occurred.
* @throws org.eclipse.jgit.errors.MissingObjectException
* revision filter needed to read additional objects, but an
* object that should be present was not found. Repository
* corruption may have occurred.
*/
public void applyFlag(final RevFilter matching, final RevFlag flag,
int rangeBegin, int rangeEnd) throws MissingObjectException,
IncorrectObjectTypeException, IOException {
final RevWalk w = flag.getRevWalk();
rangeEnd = Math.min(rangeEnd, size());
while (rangeBegin < rangeEnd) {
int index = rangeBegin;
Block s = contents;
while (s.shift > 0) {
final int i = index >> s.shift;
index -= i << s.shift;
s = (Block) s.contents[i];
}
while (rangeBegin++ < rangeEnd && index < BLOCK_SIZE) {
final RevCommit c = (RevCommit) s.contents[index++];
if (matching.include(w, c))
c.add(flag);
else
c.remove(flag);
}
}
}
/**
* Remove the given flag from all commits.
* <p>
* Same as <code>clearFlag(flag, 0, size())</code>, but without the
* incremental behavior.
*
* @param flag
* the flag to remove. Applications are responsible for
* allocating this flag from the source RevWalk.
*/
public void clearFlag(RevFlag flag) {
clearFlag(flag, 0, size());
}
/**
* Remove the given flag from all commits.
* <p>
* This method is actually implemented in terms of:
* <code>applyFlag(RevFilter.NONE, flag, rangeBegin, rangeEnd)</code>.
*
* @param flag
* the flag to remove. Applications are responsible for
* allocating this flag from the source RevWalk.
* @param rangeBegin
* first commit within the list to begin testing at, inclusive.
* Must not be negative, but may be beyond the end of the list.
* @param rangeEnd
* last commit within the list to end testing at, exclusive. If
* smaller than or equal to <code>rangeBegin</code> then no
* commits will be tested.
*/
public void clearFlag(final RevFlag flag, final int rangeBegin,
final int rangeEnd) {
try {
applyFlag(RevFilter.NONE, flag, rangeBegin, rangeEnd);
} catch (IOException e) {
// Never happen. The filter we use does not throw any
// exceptions, for any reason.
}
}
/**
* Find the next commit that has the given flag set.
*
* @param flag
* the flag to test commits against.
* @param begin
* first commit index to test at. Applications may wish to begin
* at 0, to test the first commit in the list.
* @return index of the first commit at or after index <code>begin</code>
* that has the specified flag set on it; -1 if no match is found.
*/
public int indexOf(RevFlag flag, int begin) {
while (begin < size()) {
int index = begin;
Block s = contents;
while (s.shift > 0) {
final int i = index >> s.shift;
index -= i << s.shift;
s = (Block) s.contents[i];
}
while (begin++ < size() && index < BLOCK_SIZE) {
final RevCommit c = (RevCommit) s.contents[index++];
if (c.has(flag))
return begin;
}
}
return -1;
}
/**
* Find the next commit that has the given flag set.
*
* @param flag
* the flag to test commits against.
* @param begin
* first commit index to test at. Applications may wish to begin
* at <code>size()-1</code>, to test the last commit in the
* list.
* @return index of the first commit at or before index <code>begin</code>
* that has the specified flag set on it; -1 if no match is found.
*/
public int lastIndexOf(RevFlag flag, int begin) {
begin = Math.min(begin, size() - 1);
while (begin >= 0) {
int index = begin;
Block s = contents;
while (s.shift > 0) {
final int i = index >> s.shift;
index -= i << s.shift;
s = (Block) s.contents[i];
}
while (begin-- >= 0 && index >= 0) {
final RevCommit c = (RevCommit) s.contents[index--];
if (c.has(flag))
return begin;
}
}
return -1;
}
/**
* Set the revision walker this list populates itself from.
*
* @param w
* the walker to populate from.
* @see #fillTo(int)
*/
public void source(RevWalk w) {
walker = w;
}
/**
* Is this list still pending more items?
*
* @return true if {@link #fillTo(int)} might be able to extend the list
* size when called.
*/
public boolean isPending() {
return walker != null;
}
/**
* Ensure this list contains at least a specified number of commits.
* <p>
* The revision walker specified by {@link #source(RevWalk)} is pumped until
* the given number of commits are contained in this list. If there are
* fewer total commits available from the walk then the method will return
* early. Callers can test the final size of the list by {@link #size()} to
* determine if the high water mark specified was met.
*
* @param highMark
* number of commits the caller wants this list to contain when
* the fill operation is complete.
* @throws java.io.IOException
* see {@link org.eclipse.jgit.revwalk.RevWalk#next()}
* @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
* see {@link org.eclipse.jgit.revwalk.RevWalk#next()}
* @throws org.eclipse.jgit.errors.MissingObjectException
* see {@link org.eclipse.jgit.revwalk.RevWalk#next()}
*/
@SuppressWarnings("unchecked")
public void fillTo(int highMark) throws MissingObjectException,
IncorrectObjectTypeException, IOException {
if (walker == null || size > highMark)
return;
RevCommit c = walker.next();
if (c == null) {
walker = null;
return;
}
enter(size, (E) c);
add((E) c);
while (size <= highMark) {
int index = size;
Block s = contents;
while (index >> s.shift >= BLOCK_SIZE) {
s = new Block(s.shift + BLOCK_SHIFT);
s.contents[0] = contents;
contents = s;
}
while (s.shift > 0) {
final int i = index >> s.shift;
index -= i << s.shift;
if (s.contents[i] == null)
s.contents[i] = new Block(s.shift - BLOCK_SHIFT);
s = (Block) s.contents[i];
}
final Object[] dst = s.contents;
while (size <= highMark && index < BLOCK_SIZE) {
c = walker.next();
if (c == null) {
walker = null;
return;
}
enter(size++, (E) c);
dst[index++] = c;
}
}
}
/**
* Ensures all commits until the given commit are loaded. The revision
* walker specified by {@link #source(RevWalk)} is pumped until the
* specified commit is loaded. Callers can test the final size of the list
* by {@link #size()} to determine if the high water mark specified was met.
* <p>
*
* @param commitToLoad
* commit the caller wants this list to contain when the fill
* operation is complete.
* @param highMark
* maximum number of commits the caller wants this list to
* contain when the fill operation is complete. If highMark is 0
* the walk is pumped until the specified commit or the end of
* the walk is reached.
* @throws java.io.IOException
* see {@link org.eclipse.jgit.revwalk.RevWalk#next()}
* @throws org.eclipse.jgit.errors.IncorrectObjectTypeException
* see {@link org.eclipse.jgit.revwalk.RevWalk#next()}
* @throws org.eclipse.jgit.errors.MissingObjectException
* see {@link org.eclipse.jgit.revwalk.RevWalk#next()}
*/
@SuppressWarnings("unchecked")
public void fillTo(RevCommit commitToLoad, int highMark)
throws MissingObjectException, IncorrectObjectTypeException,
IOException {
if (walker == null || commitToLoad == null
|| (highMark > 0 && size > highMark))
return;
RevCommit c = walker.next();
if (c == null) {
walker = null;
return;
}
enter(size, (E) c);
add((E) c);
while ((highMark == 0 || size <= highMark) && !c.equals(commitToLoad)) {
int index = size;
Block s = contents;
while (index >> s.shift >= BLOCK_SIZE) {
s = new Block(s.shift + BLOCK_SHIFT);
s.contents[0] = contents;
contents = s;
}
while (s.shift > 0) {
final int i = index >> s.shift;
index -= i << s.shift;
if (s.contents[i] == null)
s.contents[i] = new Block(s.shift - BLOCK_SHIFT);
s = (Block) s.contents[i];
}
final Object[] dst = s.contents;
while ((highMark == 0 || size <= highMark) && index < BLOCK_SIZE
&& !c.equals(commitToLoad)) {
c = walker.next();
if (c == null) {
walker = null;
return;
}
enter(size++, (E) c);
dst[index++] = c;
}
}
}
/**
* Optional callback invoked when commits enter the list by fillTo.
* <p>
* This method is only called during {@link #fillTo(int)}.
*
* @param index
* the list position this object will appear at.
* @param e
* the object being added (or set) into the list.
*/
protected void enter(int index, E e) {
// Do nothing by default.
}
}