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package com.c2kernel.graph.traversal;
import java.util.Vector;
import com.c2kernel.graph.model.GraphModel;
import com.c2kernel.graph.model.Vertex;
public class GraphTraversal
{
public static final int kUp = 1;
public static final int kDown = 2;
private GraphTraversal()
{
}
public static Vertex[] getTraversal(GraphModel graphModel, Vertex startVertex, int direction, boolean ignoreBackLinks)
{
Vector path = new Vector(10, 10);
graphModel.clearTags(startVertex);
visitVertex(startVertex, graphModel, path, direction, startVertex, ignoreBackLinks);
return vectorToVertexArray(path);
}
private static void visitVertex(Vertex vertex, GraphModel graphModel, Vector path, int direction, Object tag, boolean ignoreBackLinks)
{
Vertex[] children = null;
int i = 0;
if(direction == kDown)
{
children = graphModel.getOutVertices(vertex);
}
else
{
children = graphModel.getInVertices(vertex);
}
vertex.setTag(tag);
path.add(vertex);
for(i=0; i<children.length; i++)
{
if(!(children[i].hasTag(tag)))
{
boolean skipBackLink = false;
if ( ignoreBackLinks &&
((vertex.isJoin() && direction == kUp) ||
(vertex.isLoop() && direction == kDown))) {
Vertex[] following = getTraversal(graphModel, children[i], direction, false);
for (int j = 0; j < following.length; j++) {
if (following[j] == vertex) {
skipBackLink = true;
break;
}
}
}
if (!skipBackLink)
visitVertex(children[i], graphModel, path, direction, tag, ignoreBackLinks);
}
}
}
private static Vertex[] vectorToVertexArray(Vector vector)
{
Vertex[] vertices = new Vertex[vector.size()];
int i = 0;
for(i=0; i<vertices.length; i++)
{
vertices[i] = (Vertex)vector.elementAt(i);
}
return vertices;
}
}
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