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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.servlet.ServletRequest;

import com.sun.faces.util.Util;

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

    private final ServletRequest request;


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


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


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


    @Override
    public String get(Object key) {
        Util.notNull("key", key);
        return request.getParameter(key.toString());
    }


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


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


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


    @Override
    public boolean containsKey(Object key) {
        return (request.getParameter(key.toString()) != 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


    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