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/*
* Copyright (C) 2008, 2014 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.revplot;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.revwalk.RevCommit;
/**
* A commit reference to a commit in the DAG.
*
* @param <L>
* type of lane being used by the plotter.
* @see PlotCommitList
*/
public class PlotCommit<L extends PlotLane> extends RevCommit {
static final PlotCommit[] NO_CHILDREN = {};
static final PlotLane[] NO_LANES = {};
static final Ref[] NO_REFS = {};
PlotLane[] forkingOffLanes;
PlotLane[] passingLanes;
PlotLane[] mergingLanes;
PlotLane lane;
PlotCommit[] children;
Ref[] refs;
/**
* Create a new commit.
*
* @param id
* the identity of this commit.
*/
protected PlotCommit(AnyObjectId id) {
super(id);
forkingOffLanes = NO_LANES;
passingLanes = NO_LANES;
mergingLanes = NO_LANES;
children = NO_CHILDREN;
refs = NO_REFS;
}
void addForkingOffLane(PlotLane f) {
forkingOffLanes = addLane(f, forkingOffLanes);
}
void addPassingLane(PlotLane c) {
passingLanes = addLane(c, passingLanes);
}
void addMergingLane(PlotLane m) {
mergingLanes = addLane(m, mergingLanes);
}
private static PlotLane[] addLane(PlotLane l, PlotLane[] lanes) {
final int cnt = lanes.length;
switch (cnt) {
case 0:
lanes = new PlotLane[] { l };
break;
case 1:
lanes = new PlotLane[] { lanes[0], l };
break;
default:
final PlotLane[] n = new PlotLane[cnt + 1];
System.arraycopy(lanes, 0, n, 0, cnt);
n[cnt] = l;
lanes = n;
break;
}
return lanes;
}
void addChild(PlotCommit c) {
final int cnt = children.length;
switch (cnt) {
case 0:
children = new PlotCommit[] { c };
break;
case 1:
if (!c.getId().equals(children[0].getId()))
children = new PlotCommit[] { children[0], c };
break;
default:
for (PlotCommit pc : children)
if (c.getId().equals(pc.getId()))
return;
final PlotCommit[] n = new PlotCommit[cnt + 1];
System.arraycopy(children, 0, n, 0, cnt);
n[cnt] = c;
children = n;
break;
}
}
/**
* Get the number of child commits listed in this commit.
*
* @return number of children; always a positive value but can be 0.
*/
public final int getChildCount() {
return children.length;
}
/**
* Get the nth child from this commit's child list.
*
* @param nth
* child index to obtain. Must be in the range 0 through
* {@link #getChildCount()}-1.
* @return the specified child.
* @throws java.lang.ArrayIndexOutOfBoundsException
* an invalid child index was specified.
*/
public final PlotCommit getChild(int nth) {
return children[nth];
}
/**
* Determine if the given commit is a child (descendant) of this commit.
*
* @param c
* the commit to test.
* @return true if the given commit built on top of this commit.
*/
@SuppressWarnings("ReferenceEquality")
public final boolean isChild(PlotCommit c) {
for (PlotCommit a : children)
if (a == c)
return true;
return false;
}
/**
* Get the number of refs for this commit.
*
* @return number of refs; always a positive value but can be 0.
*/
public final int getRefCount() {
return refs.length;
}
/**
* Get the nth Ref from this commit's ref list.
*
* @param nth
* ref index to obtain. Must be in the range 0 through
* {@link #getRefCount()}-1.
* @return the specified ref.
* @throws java.lang.ArrayIndexOutOfBoundsException
* an invalid ref index was specified.
*/
public final Ref getRef(int nth) {
return refs[nth];
}
/**
* Obtain the lane this commit has been plotted into.
*
* @return the assigned lane for this commit.
*/
@SuppressWarnings("unchecked")
public final L getLane() {
return (L) lane;
}
@Override
public void reset() {
forkingOffLanes = NO_LANES;
passingLanes = NO_LANES;
mergingLanes = NO_LANES;
children = NO_CHILDREN;
lane = null;
super.reset();
}
}
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