com.appslandia.plum.base.TempDataManager Maven / Gradle / Ivy

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// The MIT License (MIT)
// Copyright © 2015 AppsLandia. All rights reserved.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.appslandia.plum.base;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.appslandia.common.base.TextGenerator;

/**
 *
 * @author Loc Ha
 *
 */
public abstract class TempDataManager {

	public static final String PARAM_TEMP_DATA_ID = "tempDataId";

	protected abstract TextGenerator getTempDataIdGenerator();

	protected abstract void doSaveTempData(HttpServletRequest request, HttpServletResponse response, String tempDataId, TempData tempData);

	public String saveTempData(HttpServletRequest request, HttpServletResponse response) throws Exception {
		TempData tempData = getTempData(request);
		if ((tempData == null) || tempData.isEmpty()) {
			return null;
		}
		return saveTempData(request, response, tempData);
	}

	public String saveTempData(HttpServletRequest request, HttpServletResponse response, TempData tempData) {
		String tempDataId = getTempDataIdGenerator().generate();
		doSaveTempData(request, response, tempDataId, tempData);
		return tempDataId;
	}

	protected abstract TempData doLoadTempData(HttpServletRequest request, HttpServletResponse response, String tempDataId);

	public TempData loadTempData(HttpServletRequest request, HttpServletResponse response) {
		String tempDataId = request.getParameter(PARAM_TEMP_DATA_ID);
		if (tempDataId == null) {
			return null;
		}
		TempData tempData = doLoadTempData(request, response, tempDataId);
		if (tempData == null) {
			return null;
		}
		if (tempData.containsKey(Messages.REQUEST_ATTRIBUTE_ID)) {
			request.setAttribute(Messages.REQUEST_ATTRIBUTE_ID, tempData.remove(Messages.REQUEST_ATTRIBUTE_ID));
		}
		request.setAttribute(TempData.REQUEST_ATTRIBUTE_ID, tempData);
		return tempData;
	}

	public TempData getTempData(HttpServletRequest request) {
		TempData tempData = (TempData) request.getAttribute(TempData.REQUEST_ATTRIBUTE_ID);
		Messages messages = (Messages) request.getAttribute(Messages.REQUEST_ATTRIBUTE_ID);
		if ((messages != null) && !messages.isEmpty()) {
			if (tempData == null) {
				tempData = new TempData();
			}
			tempData.put(Messages.REQUEST_ATTRIBUTE_ID, messages);
		}
		return tempData;
	}
}