Method addPatch

src/main/java/com/mxgraph/online/AbsCache.java:418–447

Adds the given patch and returns true if collaborators should be notified.

(String id, String data, String secret, String token,
			String from, String to, String lastSecret)

	 * Adds the given patch and returns true if collaborators should be notified.
	 */
	protected void addPatch(String id, String data, String secret, String token,
			String from, String to, String lastSecret)
			throws UnauthorizedException
	{
		if (secret != null && cache.remove(createTokenKey(id, secret), token))
		{
			if (from != null && to != null && data != null
					&& data.length() < maxCacheSize)
			{
				// Checks if the last patch has a valid secret
				checkPatch(id, from, lastSecret);
				cache.put(createCacheEntryKey(id, from),
					new CacheEntry(to, data, secret));

				// Maps from current to last for keeping chain valid
				if (secret != null)
				{
					cache.put(createLastVersionKey(id, to), from);
				}

				debug("addPatch id=" + id + " from=" + from + " to=" + to
						+ " secret=" + secret + " token=" + token + " data="
						+ data);
			}
		}
		else if (data != null)
		{
			throw new UnauthorizedException();
		}
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)