mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-05 08:35:26 +00:00
117 lines
2.2 KiB
C++
117 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef GFX_DIRECTEDGRAPH_H
|
|
#define GFX_DIRECTEDGRAPH_H
|
|
|
|
#include "gfxTypes.h"
|
|
#include "nsTArray.h"
|
|
|
|
namespace mozilla {
|
|
namespace layers {
|
|
|
|
template <typename T>
|
|
class DirectedGraph {
|
|
public:
|
|
|
|
class Edge {
|
|
public:
|
|
Edge(T aFrom, T aTo) : mFrom(aFrom), mTo(aTo) {}
|
|
|
|
bool operator==(const Edge& aOther) const
|
|
{
|
|
return mFrom == aOther.mFrom && mTo == aOther.mTo;
|
|
}
|
|
|
|
T mFrom;
|
|
T mTo;
|
|
};
|
|
|
|
class RemoveEdgesToComparator
|
|
{
|
|
public:
|
|
bool Equals(const Edge& a, T const& b) const { return a.mTo == b; }
|
|
};
|
|
|
|
/**
|
|
* Add a new edge to the graph.
|
|
*/
|
|
void AddEdge(Edge aEdge)
|
|
{
|
|
NS_ASSERTION(!mEdges.Contains(aEdge), "Adding a duplicate edge!");
|
|
mEdges.AppendElement(aEdge);
|
|
}
|
|
|
|
void AddEdge(T aFrom, T aTo)
|
|
{
|
|
AddEdge(Edge(aFrom, aTo));
|
|
}
|
|
|
|
/**
|
|
* Get the list of edges.
|
|
*/
|
|
const nsTArray<Edge>& GetEdgeList() const
|
|
{
|
|
return mEdges;
|
|
}
|
|
|
|
/**
|
|
* Remove the given edge from the graph.
|
|
*/
|
|
void RemoveEdge(Edge aEdge)
|
|
{
|
|
mEdges.RemoveElement(aEdge);
|
|
}
|
|
|
|
/**
|
|
* Remove all edges going into aNode.
|
|
*/
|
|
void RemoveEdgesTo(T aNode)
|
|
{
|
|
RemoveEdgesToComparator c;
|
|
while (mEdges.RemoveElement(aNode, c)) {}
|
|
}
|
|
|
|
/**
|
|
* Get the number of edges going into aNode.
|
|
*/
|
|
unsigned int NumEdgesTo(T aNode)
|
|
{
|
|
unsigned int count = 0;
|
|
for (unsigned int i = 0; i < mEdges.Length(); i++) {
|
|
if (mEdges.ElementAt(i).mTo == aNode) {
|
|
count++;
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* Get the list of all edges going from aNode
|
|
*/
|
|
void GetEdgesFrom(T aNode, nsTArray<Edge>& aResult)
|
|
{
|
|
for (unsigned int i = 0; i < mEdges.Length(); i++) {
|
|
if (mEdges.ElementAt(i).mFrom == aNode) {
|
|
aResult.AppendElement(mEdges.ElementAt(i));
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the total number of edges.
|
|
*/
|
|
unsigned int GetEdgeCount() { return mEdges.Length(); }
|
|
|
|
private:
|
|
|
|
nsTArray<Edge> mEdges;
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif // GFX_DIRECTEDGRAPH_H
|