public Content get(Key key) throws Exception {
// TODO retrieve the bkp address, then look at their content
// if the content is a link (LINK:<key>), then recursively retrieve the
// content
// of the link.
// JLG.debug("getFromKey:" + key);
Content result = null;
Queue<Address> queue = new LinkedList<Address>();
Address[] address = getAddressList(key);
Content[] contentArray = new Content[address.length];
for (int i = 0; i < address.length; i++) {
contentArray[i] = get(address[i]);
if (contentArray[i] == null) {
queue.offer(address[i]);
// TODO reassign content to address
} else {
result = contentArray[i];
}
}
if (result == null) {
return null;
}
if (result.isLink()) {
Link link = (Link) result;
// JLG.debug("key " + key + " is a link on " + link.getTargetKey());
result = get(link.getTargetKey());
}
return result;
}
public void setWithLink(OCPUser user, Content data, Link link) throws Exception {
// if a link already exists with the same key, then delete it.
Key key = link.getKey();
if (exists(key)) {
// remove both the link and its targets recursively
remove(user, key);
}
Key targetKey = link.getTargetKey();
if (exists(targetKey)) {
remove(user, targetKey);
}
// check that the link targetKey is the data key
checkLink(data, link);
Address[] address = getAddressList(key);
for (byte i = 0; i < address.length; i++) {
store(address[i], link);
}
address = getAddressList(targetKey);
for (byte i = 0; i < address.length; i++) {
store(address[i], data);
}
}
public void remove(OCPUser user, Key key) throws Exception {
if (isLink(key)) {
Link link = getLink(key);
remove(user, link.getTargetKey());
}
// remove the address corresponding to the key.
Address[] address = getAddressList(key);
for (byte i = 0; i < address.length; i++) {
// sign the address
byte[] addressSignature = user.sign(this, address[i].getBytes());
remove(address[i], addressSignature);
}
}
private void checkLink(Content data, Link link) throws Exception {
if (!data.getKey(this).equals(link.getTargetKey())) {
throw new Exception("Link corrupted.");
}
}
