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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
There is a newer version: 2.4.0
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2016 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
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package com.sun.faces.context;

import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import javax.faces.context.FacesContext;
import javax.servlet.ServletRequest;

import com.sun.faces.util.Util;

/**
 * @see javax.faces.context.ExternalContext#getRequestParameterMap() 
 */
public class RequestParameterMap extends BaseContextMap {

    private String namingContainerPrefix;
    private final ServletRequest request;
    private boolean inspectedParameterNames = false;


    // ------------------------------------------------------------ Constructors


    public RequestParameterMap(ServletRequest request) {
        this.request = request;
    }


    // -------------------------------------------------------- Methods from Map


    @Override
    public String get(Object key) {
        Util.notNull("key", key);
        if (!inspectedParameterNames) {
            inspectedParameterNames = true;
            request.getParameterNames();
        }
        String mapKey = key.toString();
        String mapValue = request.getParameter(mapKey);
        if (mapValue == null && !mapKey.startsWith(getNamingContainerPrefix())) {
            // Support cases where enduser manually obtains a request parameter while in a namespaced view.
            mapValue = request.getParameter(getNamingContainerPrefix() + mapKey);
        }
        return mapValue;
    }


    @Override
    public Set> entrySet() {
        return Collections.unmodifiableSet(super.entrySet());
    }


    @Override
    public Set keySet() {
        return Collections.unmodifiableSet(super.keySet());
    }


    /**
     * If view root is instance of naming container, return its container client id, suffixed with separator character.
     * @return The naming container prefix, or an empty string if the view root is not an instance of naming container.
     */
    protected String getNamingContainerPrefix() {
        if (null == namingContainerPrefix) {
            FacesContext context = FacesContext.getCurrentInstance();

            if (context == null) {
                return "";
            }

            namingContainerPrefix = Util.getNamingContainerPrefix(context);
        }

        return namingContainerPrefix;
    }


    @Override
    public Collection values() {
        return Collections.unmodifiableCollection(super.values());
    }


    @Override
    public boolean containsKey(Object key) {
        return (key != null && get(key) != null);
    }


    @Override
    public boolean equals(Object obj) {
        return !(obj == null ||
                 !(obj.getClass()
                   == ExternalContextImpl
                       .theUnmodifiableMapClass)) && super.equals(obj);
    }


    @Override
    public int hashCode() {
        int hashCode = 7 * request.hashCode();
        for (Iterator i = entrySet().iterator(); i.hasNext(); ) {
            hashCode += i.next().hashCode();
        }
        return hashCode;
    }


    // --------------------------------------------- Methods from BaseContextMap


    @Override
    protected Iterator> getEntryIterator() {
        return new EntryIterator(request.getParameterNames());
    }


    @Override
    protected Iterator getKeyIterator() {
        return new KeyIterator(request.getParameterNames());
    }

    
    @Override
    protected Iterator getValueIterator() {
        return new ValueIterator(request.getParameterNames());
    }

} // END RequestParameterMap