com.seer.datacruncher.spring.ValidateFilePopupController.java Source code

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Here is the source code for com.seer.datacruncher.spring.ValidateFilePopupController.java

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/*
 * Copyright (c) 2015  www.see-r.com
 * All rights reserved
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.seer.datacruncher.spring;

import com.seer.datacruncher.datastreams.DatastreamsInput;
import com.seer.datacruncher.fileupload.FileExtensionType;

import java.io.IOException;
import java.lang.reflect.Field;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

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

import org.apache.commons.io.IOUtils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class ValidateFilePopupController extends MultiActionController {
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws IOException {
        String idSchema = request.getParameter("idSchema");
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        MultipartFile multipartFile = multipartRequest.getFile("file");
        String resMsg = "";

        if (multipartFile.getOriginalFilename().endsWith(FileExtensionType.ZIP.getAbbreviation())) {
            // Case 1: When user upload a Zip file - All ZIP entries should be validate one by one      
            ZipInputStream inStream = null;
            try {
                inStream = new ZipInputStream(multipartFile.getInputStream());
                ZipEntry entry;
                while (!(isStreamClose(inStream)) && (entry = inStream.getNextEntry()) != null) {
                    if (!entry.isDirectory()) {
                        DatastreamsInput datastreamsInput = new DatastreamsInput();
                        datastreamsInput.setUploadedFileName(entry.getName());
                        byte[] byteInput = IOUtils.toByteArray(inStream);
                        resMsg += datastreamsInput.datastreamsInput(new String(byteInput), Long.parseLong(idSchema),
                                byteInput);
                    }
                    inStream.closeEntry();
                }
            } catch (IOException ex) {
                resMsg = "Error occured during fetch records from ZIP file.";
            } finally {
                if (inStream != null)
                    inStream.close();
            }
        } else {
            // Case 1: When user upload a single file. In this cae just validate a single stream 
            String datastream = new String(multipartFile.getBytes());
            DatastreamsInput datastreamsInput = new DatastreamsInput();
            datastreamsInput.setUploadedFileName(multipartFile.getOriginalFilename());

            resMsg = datastreamsInput.datastreamsInput(datastream, Long.parseLong(idSchema),
                    multipartFile.getBytes());

        }
        String msg = resMsg.replaceAll("'", "\"").replaceAll("\\n", " ");
        msg = msg.trim();
        response.setContentType("text/html");
        ServletOutputStream out = null;
        out = response.getOutputStream();
        out.write(("{success: " + true + " , message:'" + msg + "',   " + "}").getBytes());
        out.flush();
        out.close();
        return null;
    }

    /**
     * This method will use to know about the IO Stream is closed or Open.
     * There some issue in ZipInputStream.getNextEntry() some time its throws Exception of 'stream close' instead of return null.
     * So this is a method will get private field [closed] of InputStream class so program could know that stream is open or closed.
     * @return boolean
     * It will return true if stream is closed else return false
     */
    private boolean isStreamClose(ZipInputStream inStream) {
        try {
            Class c = inStream.getClass();
            Field in;
            in = c.getDeclaredField("closed");
            in.setAccessible(true);
            Boolean inReader = (Boolean) in.get(inStream);
            return inReader;
        } catch (Exception e) {
            logger.error(e);
        }
        return false;
    }
}