PrettyFacesWrappedRequest.java

/*
 * Copyright 2010 Lincoln Baxter, III
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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 <lincoln@ocpsoft.com>
 */
public class PrettyFacesWrappedRequest extends HttpServletRequestWrapper
{
    private final Map<String, String[]> modifiableParameters;

    /**
     * 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<String, String[]> additionalParams)
    {
        super(request);
        modifiableParameters = new TreeMap<String, String[]>();
        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<String, String[]> getParameterMap()
    {
       Map<String, String[]> allParameters = new TreeMap<String, String[]>();
       allParameters.putAll(super.getParameterMap());
       allParameters.putAll(modifiableParameters);
       return Collections.unmodifiableMap(allParameters);
    }

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

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