/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. * */ package org.apache.vysper.xmpp.protocol.worker; import org.apache.vysper.xmpp.protocol.ProtocolException; import org.apache.vysper.xmpp.protocol.ResponseStanzaContainer; import org.apache.vysper.xmpp.protocol.ResponseWriter; import org.apache.vysper.xmpp.protocol.SessionStateHolder; import org.apache.vysper.xmpp.protocol.StanzaHandler; import org.apache.vysper.xmpp.protocol.StateAwareProtocolWorker; import org.apache.vysper.xmpp.server.SessionContext; import org.apache.vysper.xmpp.server.SessionState; import org.apache.vysper.xmpp.stanza.Stanza; /** * high-level xmpp protocol logic, state-aware. * writes response stanzas * * @author The Apache MINA Project (dev@mina.apache.org) */ public abstract class AbstractStateAwareProtocolWorker implements StateAwareProtocolWorker { abstract public SessionState getHandledState(); public void processStanza(SessionContext sessionContext, SessionStateHolder sessionStateHolder, Stanza stanza, StanzaHandler stanzaHandler) { boolean proceed = checkState(sessionContext, sessionStateHolder, stanza, stanzaHandler); if (!proceed) return; // TODO close stream? ResponseStanzaContainer responseStanzaContainer = executeHandler(sessionContext, sessionStateHolder, stanza, stanzaHandler); writeResponse(sessionContext, responseStanzaContainer); } protected boolean checkState(SessionContext sessionContext, SessionStateHolder sessionStateHolder, Stanza stanza, StanzaHandler stanzaHandler) { return 0 == getHandledState().compareTo(sessionContext.getState()); } protected void writeResponse(SessionContext sessionContext, ResponseStanzaContainer responseStanzaContainer) { if (responseStanzaContainer != null && responseStanzaContainer.getResponseStanza() != null) { if (sessionContext == null) { throw new IllegalStateException("no session context to write stanza to: " + responseStanzaContainer.getResponseStanza()); } ResponseWriter.writeResponse(sessionContext, responseStanzaContainer); } } protected ResponseStanzaContainer executeHandler(SessionContext sessionContext, SessionStateHolder sessionStateHolder, Stanza stanza, StanzaHandler stanzaHandler) { ResponseStanzaContainer responseStanzaContainer = null; try { responseStanzaContainer = stanzaHandler.execute(stanza, sessionContext.getServerRuntimeContext(), isProcessingOutboundStanzas(), sessionContext, sessionStateHolder); } catch (ProtocolException e) { ResponseWriter.handleProtocolError(e, sessionContext, stanza); return null; } return responseStanzaContainer; } protected boolean isProcessingOutboundStanzas() { return true; } }