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 015package org.apache.tapestry.engine; 016 017import java.util.Collection; 018import 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 028public 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}