EDIT

// $Id$

/**

* Copyright (C) 2015 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package org.bgbm.biovel.drf.store;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;

import org.apache.commons.compress.compressors.gzip.GzipUtils;

import org.apache.commons.compress.utils.IOUtils;

import org.apache.commons.io.FileUtils;

import org.apache.commons.io.FilenameUtils;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * @author a.kohlbecker

 * @date Oct 20, 2015

 *

 */

public abstract class Store {

    protected Logger logger = LoggerFactory.getLogger(Neo4jStore.class);

    private static final File tmpDir = new File(System.getProperty("java.io.tmpdir"));

    private static final File userHomeDir = new File(System.getProperty("user.home"));

    private static final File utisHome = new File(userHomeDir, ".utis");

    protected File storeLocation = null;

    public Store() throws Exception {

        storeLocation = new File(utisHome, storeName() + File.separator);

        if( !storeLocation.exists()) {

            storeLocation.mkdirs();

        }

        initStoreEngine();

    }

    /**

     * @return

     */

    protected abstract String storeName();

    /**

     * @param rdfFileUri

    *

    */

    protected File downloadAndExtract(String rdfFileUri) {

           File expandedFile = null;

           CloseableHttpClient httpClient = HttpClients.createDefault();

           CloseableHttpResponse response;

           try {

               // 1. download and store in local filesystem in TMP

               logger.debug("downloading rdf file from " + rdfFileUri);

               HttpGet httpGet = new HttpGet(rdfFileUri);

               response = httpClient.execute(httpGet);

               String archiveFileName = FilenameUtils.getName(httpGet.getURI().getRawPath());

               File archiveFile = new File(tmpDir, archiveFileName);

               FileOutputStream fout = new FileOutputStream(archiveFile);

               IOUtils.copy(response.getEntity().getContent(), new FileOutputStream(archiveFile));

               fout.close();

               logger.debug(archiveFile.length() + " bytes downloaded to " + archiveFile.getCanonicalPath());

               // 2. extract the archive

               FileInputStream fin = new FileInputStream(archiveFile);

               InputStream ain = null;

               if(GzipUtils.isCompressedFilename(archiveFileName)) {

                   logger.debug("Extracting GZIP file " + archiveFile.getCanonicalPath());

                   ain = new GzipCompressorInputStream(fin);

               } else {

                   // TO UNZIP

                   //ArchiveInputStream ain = new ArchiveStreamFactory().createArchiveInputStream(ArchiveStreamFactory.ZIP, fin);

               }

               expandedFile = new File(tmpDir, GzipUtils.getUncompressedFilename(archiveFileName));

               fout = new FileOutputStream(expandedFile);

               IOUtils.copy(ain, fout);

               fout.close();

               fin.close();

               logger.debug("Extracted to " + expandedFile.getCanonicalPath());

           } catch (ClientProtocolException e) {

               // TODO Auto-generated catch block

               e.printStackTrace();

           } catch (IOException e) {

               // TODO Auto-generated catch block

               e.printStackTrace();

           }

           return expandedFile;

       }

    /**

     *

     * @param rdfFileUri

     *  the location of the file to load the rdf triples from

     * @throws Exception

     */

    public void loadIntoStore(String rdfFileUri) throws Exception {

        File rdfFile = downloadAndExtract(rdfFileUri);

        clear();

        initStoreEngine();

        load(rdfFile);

    }

    protected abstract void initStoreEngine() throws Exception;

    protected abstract void load(File rdfFile) throws Exception;

    protected void clear() throws IOException {

        if(storeLocation.exists()) {

            FileUtils.cleanDirectory(storeLocation);

        } else {

            storeLocation.mkdirs();

        }

    }

}