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AceQL HTTP is a framework of REST like http APIs that allow to access to remote SQL databases over http from any device that supports http. AceQL HTTP is provided with three client SDK: - The AceQL C# Client SDK allows to wrap the HTTP APIs using Microsoft SQL Server like calls in their code, just like they would for a local database. - The AceQL Java Client JDBC Driver allows to wrap the HTTP APIs using JDBC calls in their code, just like they would for a local database. - The AceQL Python Client SDK allows SQL calls to be encoded with standard unmodified DB-API 2.0 syntax

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/*
 * This file is part of AceQL HTTP.
 * AceQL HTTP: SQL Over HTTP
 * Copyright (C) 2020,  KawanSoft SAS
 * (http://www.kawansoft.com). All rights reserved.
 *
 * AceQL HTTP is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * AceQL HTTP is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301  USA
 *
 * Any modifications to this file must keep this entire header
 * intact.
 */
package org.kawanfw.sql.servlet;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

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

import org.kawanfw.sql.util.FrameworkDebug;

/**
 * Wrapper/holder for HttpServletRequest that will allow to set some parameters.
 *
 * @author Nicolas de Pomereu
 *
 */
public class HttpServletRequestHolder extends HttpServletRequestWrapper {

    private static boolean DEBUG = FrameworkDebug.isSet(HttpServletRequestHolder.class);

    /** The map of emulated request parameters */
    // No concurrency support to allow null values
    private Map mapParameters = new HashMap<>();

    /**
     * Constructor
     *
     * @param request the underlying HttpServletRequest
     */
    public HttpServletRequestHolder(HttpServletRequest request) {
	super(request);
    }

    /**
     * Request parameter emulation by adding a request parameter
     *
     * @param name  the parameter name
     * @param value the parameter value
     */
    public void setParameter(String name, String value) {

	Objects.requireNonNull(name, "name cannot be null!");
	mapParameters.put(name, value);
    }

    /**
     * Will return the request parameter.
     *
     * @param parameterName parameter name
     * @return the parameter value
     */
    @Override
    public String getParameter(String parameterName) {

	debug("getParameter of " + parameterName + ":");

	String value = null;
	if (mapParameters.containsKey(parameterName)) {
	    value = mapParameters.get(parameterName);
	} else {
	    value = super.getParameter(parameterName);
	}

	debug("value: " + value + ":");
	return value;

    }

    private void debug(String s) {
	if (DEBUG) {
	    System.out.println(new Date() + " " + s);
	}
    }

}