001// Copyright 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.web;
016
017import java.util.List;
018
019import javax.servlet.http.HttpSession;
020
021import org.apache.hivemind.util.Defense;
022import org.apache.tapestry.describe.DescriptionReceiver;
023
024/**
025 * Adapts {@link javax.servlet.http.HttpSession}  as
026 * {@link org.apache.tapestry.web.WebSession}.
027 * 
028 * @author Howard M. Lewis Ship
029 * @since 4.0
030 */
031public class ServletWebSession implements WebSession
032{
033    private final HttpSession _httpSession;
034
035    public ServletWebSession(HttpSession session)
036    {
037        Defense.notNull(session, "session");
038
039        _httpSession = session;
040    }
041
042    public void describeTo(DescriptionReceiver receiver)
043    {
044        receiver.describeAlternate(_httpSession);
045    }
046
047    public List getAttributeNames()
048    {
049        return WebUtils.toSortedList(_httpSession.getAttributeNames());
050    }
051
052    public Object getAttribute(String name)
053    {
054        return _httpSession.getAttribute(name);
055    }
056
057    public void setAttribute(String name, Object attribute)
058    {
059        if (attribute == null)
060            _httpSession.removeAttribute(name);
061        else
062            _httpSession.setAttribute(name, attribute);
063    }
064
065    public String getId()
066    {
067        return _httpSession.getId();
068    }
069
070    public boolean isNew()
071    {
072        return _httpSession.isNew();
073    }
074
075    public void invalidate()
076    {
077        _httpSession.invalidate();
078    }
079}