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/*
 * Copyright (c) 2003 The Visigoth Software Society. All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Visigoth Software Society (http://www.visigoths.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
 *    project contributors may be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
 *    nor may "FreeMarker" or "Visigoth" appear in their names
 *    without prior written permission of the Visigoth Software Society.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Visigoth Software Society. For more
 * information on the Visigoth Software Society, please see
 * http://www.visigoths.org/
 */

package freemarker.ext.servlet;

import javax.servlet.GenericServlet;
import javax.servlet.ServletContext;

import freemarker.template.ObjectWrapper;
import freemarker.template.TemplateHashModel;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;

/**
 * TemplateHashModel wrapper for a ServletContext attributes.
 * @author Attila Szegedi
 * @version $Id: ServletContextHashModel.java,v 1.12 2003/01/12 23:40:14 revusky Exp $
 */
public final class ServletContextHashModel implements TemplateHashModel
{
    private final GenericServlet servlet;
    private final ServletContext servletctx;
    private final ObjectWrapper wrapper;

    public ServletContextHashModel(
        GenericServlet servlet, ObjectWrapper wrapper)
    {
        this.servlet = servlet;
        this.servletctx = servlet.getServletContext();
        this.wrapper = wrapper;
    }
    
    /**
     * @deprecated use 
     * {@link #ServletContextHashModel(GenericServlet, ObjectWrapper)} instead.
     */
    public ServletContextHashModel(
        ServletContext servletctx, ObjectWrapper wrapper)
    {
        this.servlet = null;
        this.servletctx = servletctx;
        this.wrapper = wrapper;
    }

    public TemplateModel get(String key) throws TemplateModelException
    {
        return wrapper.wrap(servletctx.getAttribute(key));
    }

    public boolean isEmpty()
    {
        return !servletctx.getAttributeNames().hasMoreElements();
    }
    
    /**
     * Returns the underlying servlet. Can return null if this object was
     * created using the deprecated constructor.
     */
    public GenericServlet getServlet()
    {
        return servlet;
    }
}