TargetPathGenerator.java

package com.meteogroup.grib2geotiff.util;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.SimpleDateFormat;

import com.meteogroup.grib2geotiff.RecordMetadata;

public class TargetPathGenerator {

  private final static SimpleDateFormat ISO8601_WINDOWS = new SimpleDateFormat("yyyy-MM-dd'T'HH-mm-ss'Z'");
  private final static SimpleDateFormat ISO8601_UNIX = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");

  public static String generateTargePath(RecordMetadata metadata) {
    SimpleDateFormat sdf = getDataFormatByOs();
    StringBuffer targetDirectory = generateTargetDirectory(metadata, sdf);
    StringBuffer targetFilename = generateTargetFileName(metadata, sdf);
    return targetDirectory.toString()
        + "/"
        + targetFilename.toString();
  }

  private static StringBuffer generateTargetFileName(RecordMetadata metadata,
                                                     SimpleDateFormat sdf) {
    StringBuffer targetFilename = new StringBuffer(metadata.getName());

    if (metadata.getLevelType1() != null) {
      BigDecimal bd = new BigDecimal(metadata.getLevelValue1())
          .stripTrailingZeros()
          .setScale(0, RoundingMode.HALF_UP);

      targetFilename.append("_")
          .append(bd.longValue());
    }

    if (metadata.getLevelType2() != null) {
      BigDecimal bd = new BigDecimal(metadata.getLevelValue2())
          .stripTrailingZeros()
          .setScale(0, RoundingMode.HALF_UP);
      targetFilename.append("_")
          .append(bd.longValue());
    }

    targetFilename.append("_")
        .append(sdf.format(metadata.getForecastTime()));
    return targetFilename;
  }

  private static StringBuffer generateTargetDirectory(
      RecordMetadata metadata, SimpleDateFormat sdf) {
    StringBuffer targetDirectory = new StringBuffer()
        .append(sdf.format(metadata.getReferenceTime())).append("/")
        .append(metadata.getCategory()).append("/")
        .append(metadata.getName());
    return targetDirectory;
  }

  private static SimpleDateFormat getDataFormatByOs() {
    SimpleDateFormat sdf = ISO8601_UNIX;
    if (System.getProperty("os.name").startsWith("Windows")) {
      sdf = ISO8601_WINDOWS;
    }
    return sdf;
  }

}