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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
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/*
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 *
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 *
 * 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.dev.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:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
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 *
 * Modifications:
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package com.sun.faces.context;

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

import javax.faces.application.Application;
import javax.faces.component.NamingContainer;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.servlet.ServletRequest;

import com.sun.faces.config.WebConfiguration;
import com.sun.faces.config.WebConfiguration.BooleanWebContextInitParameter;
import com.sun.faces.util.Util;

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

    private String namingContainerId;
    private final boolean namespaceParameters;
    private final ServletRequest request;
    private boolean inspectedParameterNames = false;


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


    public RequestParameterMap(ServletRequest request) {
        this.request = request;
        WebConfiguration webConfig = WebConfiguration.getInstance();
        namespaceParameters = webConfig.isOptionEnabled(
                  BooleanWebContextInitParameter.NamespaceParameters);
    }


    // -------------------------------------------------------- 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 = null;
        if (namespaceParameters) {
            mapValue = request.getParameter(getNamingContainerId() + mapKey);
        }
        if (mapValue == null) {
        	mapValue = request.getParameter(mapKey);
        }
        return mapValue;
    }


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


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


    protected String getNamingContainerId() {
        if (null == namingContainerId) {
            FacesContext context = FacesContext.getCurrentInstance();
            UIViewRoot viewRoot = context.getViewRoot();
            if (viewRoot == null) {
                Application application = context.getApplication();
                viewRoot = (UIViewRoot) application.createComponent(UIViewRoot.COMPONENT_TYPE);
            }
            if (viewRoot instanceof NamingContainer) {
                namingContainerId = viewRoot.getContainerClientId(context);
            } else {
                namingContainerId = "";
            }
        }
        return namingContainerId;
    }


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


    @Override
    public boolean containsKey(Object key) {    	
    	boolean containsKey = false;
    	String mapKey = key.toString();
        if (namespaceParameters) {
            containsKey = (request.getParameter(getNamingContainerId() + mapKey) != null);
        }
        if (!containsKey) {
        	containsKey = (request.getParameter(mapKey) != null);
        }
        return containsKey;
    }


    @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


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


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

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

} // END RequestParameterMap