Added BdfIncomingMessageHook.

briar-core/src/org/briarproject/clients/BdfIncomingMessageHook.java

+package org.briarproject.clients;
+
+import org.briarproject.api.FormatException;
+import org.briarproject.api.clients.ClientHelper;
+import org.briarproject.api.clients.MessageQueueManager.IncomingQueueMessageHook;
+import org.briarproject.api.clients.QueueMessage;
+import org.briarproject.api.data.BdfDictionary;
+import org.briarproject.api.data.BdfList;
+import org.briarproject.api.data.MetadataParser;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.db.Metadata;
+import org.briarproject.api.db.Transaction;
+import org.briarproject.api.sync.Message;
+import org.briarproject.api.sync.ValidationManager.IncomingMessageHook;
+import org.briarproject.api.system.Clock;
+
+import static org.briarproject.api.clients.QueueMessage.QUEUE_MESSAGE_HEADER_LENGTH;
+import static org.briarproject.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
+
+public abstract class BdfIncomingMessageHook implements IncomingMessageHook,
+		IncomingQueueMessageHook {
+
+	protected final ClientHelper clientHelper;
+	protected final MetadataParser metadataParser;
+
+	protected BdfIncomingMessageHook(ClientHelper clientHelper,
+			MetadataParser metadataParser, Clock clock) {
+		this.clientHelper = clientHelper;
+		this.metadataParser = metadataParser;
+	}
+
+	protected abstract void incomingMessage(Transaction txn, BdfList message,
+			BdfDictionary meta) throws DbException, FormatException;
+
+	@Override
+	public void incomingMessage(Transaction txn, Message m, Metadata meta)
+			throws DbException {
+		incomingMessage(txn, m, meta, MESSAGE_HEADER_LENGTH);
+	}
+
+	@Override
+	public void incomingMessage(Transaction txn, QueueMessage q, Metadata meta)
+			throws DbException {
+		incomingMessage(txn, q, meta, QUEUE_MESSAGE_HEADER_LENGTH);
+	}
+
+	private void incomingMessage(Transaction txn, Message m, Metadata meta,
+			int headerLength) throws DbException {
+		try {
+			byte[] raw = m.getRaw();
+			BdfList message = clientHelper.toList(raw, headerLength,
+					raw.length - headerLength);
+			BdfDictionary metaDictionary = metadataParser.parse(meta);
+			incomingMessage(txn, message, metaDictionary);
+		} catch (FormatException e) {
+			throw new DbException(e);
+		}
+	}
+}