001 // Copyright 2004, 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.engine; 016 017 import java.util.Collection; 018 import java.util.Collections; 019 020 /** 021 * Concrete implementation of {@link org.apache.tapestry.IEngine} used for ordinary applications. 022 * All page state information is maintained in the {@link javax.servlet.http.HttpSession} using 023 * instances of {@link org.apache.tapestry.record.SessionPageRecorder}. 024 * 025 * @author Howard Lewis Ship 026 */ 027 028 public class BaseEngine extends AbstractEngine 029 { 030 /** 031 * Returns an unmodifiable {@link Collection} of the page names for which {@link IPageRecorder} 032 * instances exist. Note: Starting in 4.0, this method is deprecated and returns an empty list. 033 * 034 * @deprecated 035 */ 036 037 public Collection getActivePageNames() 038 { 039 return Collections.EMPTY_LIST; 040 041 } 042 }