CSVDownloadService.java

package service;

import api.v1.CSVFile;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class CSVDownloadService {

  public CSVDownloadService() {
  }

  public List<CSVFile> getCsvFiles(String csvLocationProperty, String csvUrl) {
    List<CSVFile> result = new ArrayList<CSVFile>();
    String dir = PoseidonPropertyService.getProperty(csvLocationProperty);

    File csvDir = new File(dir);

    File[] csvFiles = csvDir.listFiles((dir1, name) -> {
      return name.endsWith(".csv");
    });

    if ( csvFiles != null && csvFiles.length > 0) {
      // sort, newest first
      Arrays.sort(csvFiles, (f1, f2) -> Long.compare(f2.lastModified(), f1.lastModified()));

      for (File csvFile : csvFiles) {
        result.add(new CSVFile(csvUrl + csvFile.getName(), csvFile.getName()));
      }
    }
    return result;
  }
}