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/*
 * PrettyFaces is an OpenSource JSF library to create bookmarkable URLs.
 * Copyright (C) 2010 - Lincoln Baxter, III  This program
 * is free software: you can redistribute it and/or modify it under the terms of
 * the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version. This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details. You should have received a copy of the GNU Lesser General
 * Public License along with this program. If not, see the file COPYING.LESSER
 * or visit the GNU website at .
 */

package com.ocpsoft.pretty.faces.servlet;

import java.util.Collections;
import java.util.Enumeration;
import java.util.Map;
import java.util.TreeMap;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

/**
 * @author Lincoln Baxter, III 
 */
public class PrettyFacesWrappedRequest extends HttpServletRequestWrapper
{
    private final Map modifiableParameters;
    private Map allParameters = null;

    /**
     * Create a new request wrapper that will merge additional parameters into
     * the request object without prematurely reading parameters from the
     * original request.
     * 
     * @param request
     * @param additionalParams
     */
    public PrettyFacesWrappedRequest(final HttpServletRequest request, final Map additionalParams)
    {
        super(request);
        modifiableParameters = new TreeMap();
        modifiableParameters.putAll(additionalParams);
    }

    @Override
    public String getParameter(final String name)
    {
        String[] strings = getParameterMap().get(name);
        if (strings != null)
        {
            return strings[0];
        }
        return null;
    }

    @Override
    public Map getParameterMap()
    {
        if (allParameters == null)
        {
            allParameters = new TreeMap();
            allParameters.putAll(super.getParameterMap());
            allParameters.putAll(modifiableParameters);
        }
        return Collections.unmodifiableMap(allParameters);
    }

    @Override
    public Enumeration getParameterNames()
    {
        return Collections.enumeration(getParameterMap().keySet());
    }

    @Override
    public String[] getParameterValues(final String name)
    {
        return getParameterMap().get(name);
    }
}