src/main/java/freemarker/ext/servlet/HttpRequestHashModel.java

/*
 * 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 visigoths@visigoths.org.
 *
 * 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 java.util.ArrayList;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import freemarker.template.ObjectWrapper;
import freemarker.template.SimpleCollection;
import freemarker.template.TemplateCollectionModel;
import freemarker.template.TemplateHashModelEx;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;

/**
 * TemplateHashModel wrapper for a HttpServletRequest attributes.
 * @author Attila Szegedi
 */
public final class HttpRequestHashModel implements TemplateHashModelEx
{
    private final HttpServletRequest request;
    private final HttpServletResponse response;
    private final ObjectWrapper wrapper;

    public HttpRequestHashModel(
        HttpServletRequest request, ObjectWrapper wrapper)
    {
        this(request, null, wrapper);
    }

    public HttpRequestHashModel(
        HttpServletRequest request, HttpServletResponse response, 
        ObjectWrapper wrapper)
    {
        this.request = request;
        this.response = response;
        this.wrapper = wrapper;
    }
    
    public TemplateModel get(String key) throws TemplateModelException
    {
        return wrapper.wrap(request.getAttribute(key));
    }

    public boolean isEmpty()
    {
        return !request.getAttributeNames().hasMoreElements();
    }
    
    public int size() {
        int result = 0;
        for (Enumeration enumeration = request.getAttributeNames(); enumeration.hasMoreElements();) {
            enumeration.nextElement();
            ++result;
        }
        return result;
    }
    
    public TemplateCollectionModel keys() {
        ArrayList keys = new ArrayList();
        for (Enumeration enumeration = request.getAttributeNames(); enumeration.hasMoreElements();) {
            keys.add(enumeration.nextElement());
        }
        return new SimpleCollection(keys.iterator());
    }
    
    public TemplateCollectionModel values() {
        ArrayList values = new ArrayList();
        for (Enumeration enumeration = request.getAttributeNames(); enumeration.hasMoreElements();) {
            values.add(request.getAttribute((String)enumeration.nextElement()));
        }
        return new SimpleCollection(values.iterator(), wrapper);
    }

    public HttpServletRequest getRequest()
    {
        return request;
    }
    
    public HttpServletResponse getResponse()
    {
        return response;
    }
    
    public ObjectWrapper getObjectWrapper()
    {
        return wrapper;
    }
}