public static boolean isValidTrivialCyclicGraph(SerializableDoublyLinkedNode actual) {
if (actual == null) {
return false;
}
if (!actual.getData().equals("head")) {
return false;
}
SerializableDoublyLinkedNode lchild = actual.getLeftChild();
if (lchild == null) {
return false;
}
SerializableDoublyLinkedNode rchild = actual.getRightChild();
if (rchild == null) {
return false;
}
if (actual != lchild && actual != rchild) {
return false;
}
return true;
}
public static boolean isValidComplexCyclicGraph(SerializableDoublyLinkedNode actual) {
assertNotNull(actual);
if (actual == null) {
return false;
}
int i = 0;
SerializableDoublyLinkedNode currNode = actual;
for (; i < 5; ++i) {
assertEquals("n" + Integer.toString(i), currNode.getData());
if (!currNode.getData().equals("n" + Integer.toString(i))) {
return false;
}
SerializableDoublyLinkedNode nextNode = currNode.getRightChild();
SerializableDoublyLinkedNode prevNode = currNode.getLeftChild();
assertNotNull("next node", nextNode);
assertNotNull("prev node", prevNode);
if (nextNode == null || prevNode == null) {
return false;
}
assertSame("A", currNode, nextNode.getLeftChild());
if (nextNode.getLeftChild() != currNode) {
return false;
}
assertSame("B", currNode, prevNode.getRightChild());
if (prevNode.getRightChild() != currNode) {
return false;
}
currNode = currNode.getRightChild();
if (currNode == actual) {
break;
}
}
assertFalse("i = " + i, i >= 4);
if (i >= 4) {
return false;
}
return true;
}
public static boolean isValidAcyclicGraph(SerializableDoublyLinkedNode actual) {
if (actual == null) {
return false;
}
if (!actual.getData().equals("head")) {
return false;
}
SerializableDoublyLinkedNode leftChild = actual.getLeftChild();
if (leftChild == null) {
return false;
}
if (!leftChild.getData().equals("lchild")) {
return false;
}
if (leftChild.getLeftChild() != null || leftChild.getRightChild() != null) {
return false;
}
SerializableDoublyLinkedNode rightChild = actual.getRightChild();
if (rightChild == null) {
return false;
}
if (!rightChild.getData().equals("rchild")) {
return false;
}
if (rightChild.getLeftChild() != null || rightChild.getRightChild() != null) {
return false;
}
return true;
}