| // Copyright 2005 The Apache Software Foundation |
| // |
| // Licensed 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.tapestry.engine.state; |
| |
| import org.apache.tapestry.SessionStoreOptimized; |
| import org.apache.tapestry.web.WebRequest; |
| import org.apache.tapestry.web.WebSession; |
| |
| /** |
| * Manager for the 'session' scope; state objects are stored as HttpSession |
| * attributes. The HttpSession is created as necessary. |
| * |
| * @author Howard M. Lewis Ship |
| * @since 4.0 |
| */ |
| public class SessionScopeManager implements StateObjectPersistenceManager |
| { |
| |
| private WebRequest _request; |
| |
| private String _applicationId; |
| |
| private String buildKey(String objectName) |
| { |
| // For Portlets, the application id is going to be somewhat redundant, |
| // since |
| // the Portlet API keeps portlets seperate anyway. |
| |
| return "state:" + _applicationId + ":" + objectName; |
| } |
| |
| /** |
| * Returns the session for the current request, creating it if necessary. |
| */ |
| |
| private WebSession getSession() |
| { |
| return _request.getSession(true); |
| } |
| |
| public boolean exists(String objectName) |
| { |
| WebSession session = _request.getSession(false); |
| |
| if (session == null) return false; |
| |
| return session.getAttribute(buildKey(objectName)) != null; |
| } |
| |
| public Object get(String objectName, StateObjectFactory factory) |
| { |
| String key = buildKey(objectName); |
| WebSession session = getSession(); |
| |
| Object result = session.getAttribute(key); |
| if (result == null) |
| { |
| result = factory.createStateObject(); |
| session.setAttribute(key, result); |
| } |
| |
| return result; |
| } |
| |
| public void store(String objectName, Object stateObject) |
| { |
| if (stateObject instanceof SessionStoreOptimized) |
| { |
| SessionStoreOptimized optimized = (SessionStoreOptimized) stateObject; |
| |
| if (!optimized.isStoreToSessionNeeded()) |
| return; |
| } |
| |
| String key = buildKey(objectName); |
| |
| WebSession session = getSession(); |
| |
| session.setAttribute(key, stateObject); |
| } |
| |
| public void setApplicationId(String applicationName) |
| { |
| _applicationId = applicationName; |
| } |
| |
| public void setRequest(WebRequest request) |
| { |
| _request = request; |
| } |
| } |