/*
 * Copyright (c) 2005-2011 Grameen Foundation USA
 * All rights reserved.
 *
 * 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.
 *
 * See also http://www.apache.org/licenses/LICENSE-2.0.html for an
 * explanation of the license and how it is applied.
 */

package org.mifos.framework.servlet;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import org.apache.commons.collections.iterators.IteratorEnumeration;

@Deprecated // used only in reporting
@SuppressWarnings("deprecation")
public class ModifiableParameterServletRequest extends HttpServletRequestWrapper {
    List<String> removedParameterList;

    public ModifiableParameterServletRequest(HttpServletRequest originalRequest) {
        super(originalRequest);
        removedParameterList = new ArrayList<String>();
    }

    public void removeParameter(String string) {
        removedParameterList.add(string);
    }

    @Override
    public String getParameter(String arg0) {
        if (removedParameterList.contains(arg0)) {
            return null;
        }
        return getRequest().getParameter(arg0);
    }

    @Override
    public Map<String, String[]> getParameterMap() {
        Map<String, String[]> parameterMap = updatedParameterList();
        return parameterMap;
    }

    private Map<String, String[]> updatedParameterList() {
        Map<String, String[]> parameterMap = new HashMap<String, String[]>(getRequest().getParameterMap());
        for (String removeParameterName : removedParameterList) {
            parameterMap.remove(removeParameterName);
        }
        return parameterMap;
    }

    @Override
    public Enumeration getParameterNames() {
        Enumeration parameterNames = getRequest().getParameterNames();
        List paramNames = new ArrayList();
        while (parameterNames.hasMoreElements()) {
            Object nextElement = parameterNames.nextElement();
            if (!removedParameterList.contains(nextElement)) {
                paramNames.add(nextElement);
            }
        }
        return new IteratorEnumeration(paramNames.iterator());
    }

    @Override
    public String[] getParameterValues(String arg0) {
        if (removedParameterList.contains(arg0)) {
            return null;
        }
        return getRequest().getParameterValues(arg0);
    }
}