public MerkleTree(Vector<Indexable> v) {
nodeMap = new HashMap<Integer, MerkleTreeNode>();
this.store = v;
int exp = 0;
while ((int) Math.pow(2, exp) < store.size()) {
exp++;
}
for (int i = store.size(); i < (int) Math.pow(2, exp); i++) {
store.add(i, null);
}
Vector<MerkleTreeNode> hashes = new Vector<MerkleTreeNode>();
for (int i = 0; i < store.size(); i++) {
if (store.get(i) != null) {
MerkleTreeNode temp = new MerkleTreeNode(store.get(i).getBytes(), i);
nodeMap.put(i, temp);
hashes.add(temp);
} else {
MerkleTreeNode temp = new MerkleTreeNode(i);
nodeMap.put(i, temp);
hashes.add(temp);
}
}
while (hashes.size() > 1) {
Vector<MerkleTreeNode> temp = new Vector<MerkleTreeNode>();
for (int i = 0; i < hashes.size(); i += 2) {
temp.add(MerkleTreeNode.combineDigestFactory(hashes.get(i), hashes.get(i + 1)));
}
hashes = temp;
}
root = hashes.get(0);
}
private MerkleTreeNode update(MerkleTreeNode node) {
MerkleTreeNode retNode = null;
if (!node.dirty) {
retNode = node;
} else {
retNode =
MerkleTreeNode.combineDigestFactory(update(node.leftChild), update(node.rightChild));
}
return retNode;
}
public void updateLeafData(int index, Indexable b) {
// Check to see if we need to grow tree
if (index <= root.max) {
// node already exists, simply update
store.set(index, b);
MerkleTreeNode node = nodeMap.get(index);
MerkleTreeNode newNode = new MerkleTreeNode(b.getBytes(), index);
newNode.parent = node.parent;
if (newNode.parent.leftChild == node) {
newNode.parent.leftChild = newNode;
} else {
newNode.parent.rightChild = newNode;
}
markChainDirty(newNode);
} else {
// node is beyond our scope, grow tree
while (index > root.max) {
Vector<Indexable> vec = new Vector<Indexable>();
int origSize = store.size();
for (int i = origSize; i < 2 * origSize; i++) {
if (i == index) {
vec.add(i - origSize, b);
} else {
vec.add(i - origSize, null);
}
}
MerkleTree newtree = new MerkleTree(vec);
root = MerkleTreeNode.combineDigestFactory(root, newtree.root);
for (int i = origSize; i < 2 * origSize; i++) {
MerkleTreeNode tempNode = newtree.nodeMap.get(i - origSize);
tempNode.max += origSize;
tempNode.min += origSize;
nodeMap.put(i, tempNode);
store.add(i, newtree.store.get(i - origSize));
}
}
}
}