/**
* @param vertexValues is the list of vertex values.
* @param adjacencyMatrix is the adjacency matrix with the connections from the graph.
* @param vertexIndex is the index of the vertex value to build the connection list.
* @return a list of vertex values based on the connectivity of the given index on the adjacency
* matrix.
*/
private static List<String> makeConnections(
String[] vertexValues, boolean[][] adjacencyMatrix, int vertexIndex) {
Preconditions.checkArgument(vertexValues != null, "The vertex values must be provided.");
Preconditions.checkArgument(adjacencyMatrix != null, "The adjacency matrix must be provided.");
Preconditions.checkArgument(
vertexIndex >= 0, "The vertex index must be greater than or equals to 0.");
List<String> connections = new SinglyLinkedList<>();
for (int i = 0; i < adjacencyMatrix.length; i++) {
if (adjacencyMatrix[vertexIndex][i]) {
connections.add(vertexValues[i]);
}
}
return connections;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
for (int i = 0; i < vertexes.length; i++) {
if (i == rootIndex) {
builder.append("-> ");
}
builder.append(vertexes[i].getValue());
builder.append(": ");
List<Type> connections = vertexes[i].getConnections();
Iterator<Type> it = connections.iterator();
while (it.hasNext()) {
Type value = it.next();
builder.append(value);
if (it.hasNext()) {
builder.append(", ");
}
}
builder.append("\n");
}
return builder.toString();
}