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/*
* 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;
/**
* A queue of commits in FIFO order.
*/
public class FIFORevQueue extends BlockRevQueue {
private Block head;
private Block tail;
/** Create an empty FIFO queue. */
public FIFORevQueue() {
super(false);
}
FIFORevQueue(boolean firstParent) {
super(firstParent);
}
FIFORevQueue(Generator s) throws MissingObjectException,
IncorrectObjectTypeException, IOException {
super(s);
}
@Override
public void add(RevCommit c) {
Block b = tail;
if (b == null) {
b = free.newBlock();
b.add(c);
head = b;
tail = b;
return;
} else if (b.isFull()) {
b = free.newBlock();
tail.next = b;
tail = b;
}
b.add(c);
}
/**
* Insert the commit pointer at the front of the queue.
*
* @param c
* the commit to insert into the queue.
*/
public void unpop(RevCommit c) {
Block b = head;
if (b == null) {
b = free.newBlock();
b.resetToMiddle();
b.add(c);
head = b;
tail = b;
return;
} else if (b.canUnpop()) {
b.unpop(c);
return;
}
b = free.newBlock();
b.resetToEnd();
b.unpop(c);
b.next = head;
head = b;
}
@Override
public RevCommit next() {
final Block b = head;
if (b == null)
return null;
final RevCommit c = b.pop();
if (b.isEmpty()) {
head = b.next;
if (head == null)
tail = null;
free.freeBlock(b);
}
return c;
}
@Override
public void clear() {
head = null;
tail = null;
free.clear();
}
@Override
boolean everbodyHasFlag(int f) {
for (Block b = head; b != null; b = b.next) {
for (int i = b.headIndex; i < b.tailIndex; i++)
if ((b.commits[i].flags & f) == 0)
return false;
}
return true;
}
@Override
boolean anybodyHasFlag(int f) {
for (Block b = head; b != null; b = b.next) {
for (int i = b.headIndex; i < b.tailIndex; i++)
if ((b.commits[i].flags & f) != 0)
return true;
}
return false;
}
void removeFlag(int f) {
final int not_f = ~f;
for (Block b = head; b != null; b = b.next) {
for (int i = b.headIndex; i < b.tailIndex; i++)
b.commits[i].flags &= not_f;
}
}
@Override
public String toString() {
final StringBuilder s = new StringBuilder();
for (Block q = head; q != null; q = q.next) {
for (int i = q.headIndex; i < q.tailIndex; i++)
describe(s, q.commits[i]);
}
return s.toString();
}
}
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