When trying to access the Edge array in my SetAdjList() method, I get a Null pointer exception. Attempting to access the Edge array in any of my other methods in this class have no errors and return correct results. I am not changing the Edge array in any of my other classes. Any ideas are greatly appreciated.
public class ReadInput {
Vertex[] vertex = new Vertex[25252];
final String DELIMITER = ",";
int indexVertex = 0;
public Edge[] edge = new Edge[127807];
int indexEdge = 0;
Map<Vertex,List <Edge> > edgeHash= new HashMap();
public Graph readFromStream() throws NumberFormatException, IOException {
Graph graph = new Graph();
//25252 number of elements in Place.txt file
//Delimiter used in CSV file
String line = "";
//Create the file reader
BufferedReader fileReader = new BufferedReader(new FileReader("Place.txt"));
String IDString = null;
String name = null;
int ID = 0;
//Read the file line by line
while ((line = fileReader.readLine()) != null)
{
//Get all tokens available in line
String[] tokens = line.split(DELIMITER);
IDString = tokens[0];
name = tokens[1];
ID = Integer.parseInt(IDString);
vertex[indexVertex] = new Vertex(ID,name);
//graph.addVertex(ID,name);
//System.out.println(indexVertex +":" + vertex[indexVertex].getID());
indexVertex++;
}
fileReader.close();
String line2 = "";
BufferedReader fileReader2 = new BufferedReader(new FileReader("Road.txt"));
String valueString = null;
String vertex1IDName = null;
String vertex2IDName = null;
String extra = null;
float value = 0;
int vertex1ID = 0;
int vertex2ID = 0;
//Read the file line by line
while ((line2 = fileReader2.readLine()) != null)
{
//Get all tokens available in line
String[] tokens2 = line2.split(DELIMITER);
vertex1IDName = tokens2[0];
vertex2IDName = tokens2[1];
valueString = tokens2[2];
if(tokens2.length - 1 == 3) {
extra = tokens2[tokens2.length - 1];
}
else {
extra = "";
}
vertex1ID = Integer.parseInt(vertex1IDName);
vertex2ID = Integer.parseInt(vertex2IDName);
value = Float.parseFloat(valueString);
graph.addVertex(vertex1ID, " ");
graph.addVertex(vertex2ID, " ");
Vertex v1 = new Vertex(0, " ");
Vertex v2 = new Vertex(0, " ");
for(int i = 0; i<indexVertex; i++) {
if(vertex1ID == vertex[i].getID()) {
v1 = vertex[i];
}
else if(vertex1ID != 0) {
v1.setID(vertex1ID);
}
if(vertex2ID == vertex[i].getID()) {
v2 = vertex[i];
}
else if(vertex2ID != 0) {
v2.setID(vertex2ID);
}
}
if(v1.getID() != 0 && v2.getID() !=0) {
edge[indexEdge] = new Edge(value,v1, v2, extra);
System.out.println("["+ indexEdge +"] Edge v1: " + edge[indexEdge].getStartVertex().getID() + " v2: " + v2.getID());
v1.addNeighbour(edge[indexEdge]);
edgeHash.put(v1, v1.getAdjacenciesList());
indexEdge++;
}
}
//This test prints correctly
//System.out.println("Test:" + edge[0].getStartVertex().getID());
fileReader2.close();
return graph;
}
public Vertex calcualteDestination() {
Scanner scanUserInput = new Scanner(System.in);
System.out.println("Enter the Destination Name:");
String destinationName = scanUserInput.nextLine();
scanUserInput.close();
Vertex Destination = new Vertex(0,null);
for(int i = 0; i<indexVertex; i++) {
if(destinationName.equals(vertex[i].getName())){
//Destination = vertex[i];
Destination.setID(vertex[i].getID());
Destination.setName(vertex[i].getName());
//Destination.setAdjacenciesList(vertex[i].getAdjacenciesList());
}
}
for(int k = 0; k<indexEdge; k++) {
if(Destination.getID() == edge[k].getTargetVertex().getID()){
Destination.setID(edge[k].getTargetVertex().getID());
Destination.setAdjacenciesList(edge[k].getTargetVertex().getAdjacenciesList());
//System.out.println("ID set from edge");
}
}
return Destination;
}
public Vertex calculatesSource() {
Scanner scanUserInput = new Scanner(System.in);
System.out.println("Enter the Source Name:");
String sourceName = scanUserInput.nextLine();
Vertex Source = new Vertex(0, null);
for(int i = 0; i<indexVertex; i++) {
if(sourceName.equals(vertex[i].getName())){
//Source = vertex[i];
Source.setID(vertex[i].getID());
//System.out.println("ID: " + Source.getID());
Source.setName(vertex[i].getName());
//Source.setAdjacenciesList(vertex[i].getAdjacenciesList());
}
}
for(int k = 0; k<indexEdge; k++) {
if(Source.getID() == edge[k].getStartVertex().getID()){
Source.setID(edge[k].getStartVertex().getID());
Source.setAdjacenciesList(edge[k].getStartVertex().getAdjacenciesList());
//System.out.println(" Source adj size: "+Source.getAdjacenciesList().size());
}
}
return Source;
}
public Vertex SetAdjList(Vertex actualVertex) {
System.out.println("setAdjList id:" + actualVertex.getID());
//edge[0] out of scope for some reason, works for other funcs
//NULL POINTER exception on below line
System.out.println("Test:" + edge[0].getStartVertex().getID());
for(int j = 0; j<edge.length; j++) {
System.out.println("j:" + j);
if(actualVertex.getID() == edge[j].getStartVertex().getID()){ //.getID()
actualVertex.setAdjacenciesList(edge[j].getStartVertex().getAdjacenciesList());
System.out.println(" Source adj size: "+actualVertex.getAdjacenciesList().size());
}
}
return actualVertex;
}
}
