Source Code Cross Referenced for HttpSessionHashModel.java in  » Template-Engine » freemarker-2.3.10 » freemarker » ext » servlet » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Template Engine » freemarker 2.3.10 » freemarker.ext.servlet 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2003 The Visigoth Software Society. All rights
003:         * reserved.
004:         *
005:         * Redistribution and use in source and binary forms, with or without
006:         * modification, are permitted provided that the following conditions
007:         * are met:
008:         *
009:         * 1. Redistributions of source code must retain the above copyright
010:         *    notice, this list of conditions and the following disclaimer.
011:         *
012:         * 2. Redistributions in binary form must reproduce the above copyright
013:         *    notice, this list of conditions and the following disclaimer in
014:         *    the documentation and/or other materials provided with the
015:         *    distribution.
016:         *
017:         * 3. The end-user documentation included with the redistribution, if
018:         *    any, must include the following acknowledgement:
019:         *       "This product includes software developed by the
020:         *        Visigoth Software Society (http://www.visigoths.org/)."
021:         *    Alternately, this acknowledgement may appear in the software itself,
022:         *    if and wherever such third-party acknowledgements normally appear.
023:         *
024:         * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
025:         *    project contributors may be used to endorse or promote products derived
026:         *    from this software without prior written permission. For written
027:         *    permission, please contact visigoths@visigoths.org.
028:         *
029:         * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030:         *    nor may "FreeMarker" or "Visigoth" appear in their names
031:         *    without prior written permission of the Visigoth Software Society.
032:         *
033:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036:         * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044:         * SUCH DAMAGE.
045:         * ====================================================================
046:         *
047:         * This software consists of voluntary contributions made by many
048:         * individuals on behalf of the Visigoth Software Society. For more
049:         * information on the Visigoth Software Society, please see
050:         * http://www.visigoths.org/
051:         */
052:
053:        package freemarker.ext.servlet;
054:
055:        import java.io.Serializable;
056:
057:        import javax.servlet.http.HttpServletRequest;
058:        import javax.servlet.http.HttpServletResponse;
059:        import javax.servlet.http.HttpSession;
060:
061:        import freemarker.template.ObjectWrapper;
062:        import freemarker.template.TemplateHashModel;
063:        import freemarker.template.TemplateModel;
064:        import freemarker.template.TemplateModelException;
065:
066:        /**
067:         * TemplateHashModel wrapper for a HttpSession attributes.
068:         * @author Attila Szegedi
069:         * @version $Id: HttpSessionHashModel.java,v 1.14.4.1 2006/04/19 16:16:43 szegedia Exp $
070:         */
071:
072:        public final class HttpSessionHashModel implements  TemplateHashModel,
073:                Serializable {
074:            private static final long serialVersionUID = 1L;
075:            private transient HttpSession session;
076:            private transient final ObjectWrapper wrapper;
077:
078:            // These are required for lazy initializing session
079:            private transient final FreemarkerServlet servlet;
080:            private transient final HttpServletRequest request;
081:            private transient final HttpServletResponse response;
082:
083:            /**
084:             * Use this constructor when the session already exists.
085:             * @param session the session
086:             * @param wrapper an object wrapper used to wrap session attributes
087:             */
088:            public HttpSessionHashModel(HttpSession session,
089:                    ObjectWrapper wrapper) {
090:                this .session = session;
091:                this .wrapper = wrapper;
092:
093:                this .servlet = null;
094:                this .request = null;
095:                this .response = null;
096:            }
097:
098:            /**
099:             * Use this constructor when the session isn't already created. It is passed
100:             * enough parameters so that the session can be properly initialized after
101:             * it is detected that it was created.
102:             * @param servlet the FreemarkerServlet that created this model. If the
103:             * model is not created through FreemarkerServlet, leave this argument as
104:             * null.
105:             * @param request the actual request
106:             * @param response the actual response
107:             * @param wrapper an object wrapper used to wrap session attributes
108:             */
109:            public HttpSessionHashModel(FreemarkerServlet servlet,
110:                    HttpServletRequest request, HttpServletResponse response,
111:                    ObjectWrapper wrapper) {
112:                this .wrapper = wrapper;
113:
114:                this .servlet = servlet;
115:                this .request = request;
116:                this .response = response;
117:            }
118:
119:            public TemplateModel get(String key) throws TemplateModelException {
120:                checkSessionExistence();
121:                return wrapper.wrap(session != null ? session.getAttribute(key)
122:                        : null);
123:            }
124:
125:            private void checkSessionExistence() throws TemplateModelException {
126:                if (session == null && request != null) {
127:                    session = request.getSession(false);
128:                    if (session != null && servlet != null) {
129:                        try {
130:                            servlet.initializeSession(request, response);
131:                        } catch (Exception e) {
132:                            throw new TemplateModelException(e);
133:                        }
134:                    }
135:                }
136:            }
137:
138:            boolean isZombie() {
139:                return session == null && request == null;
140:            }
141:
142:            public boolean isEmpty() throws TemplateModelException {
143:                checkSessionExistence();
144:                return session == null
145:                        || !session.getAttributeNames().hasMoreElements();
146:            }
147:        }
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