Android Open Source - field-data-app Util

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License

The source code is released under:

MIT License

Java Source Code

package nz.cri.gns.springs.util;
//from w  ww  .ja v a2  s.  com
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.Locale;

import android.content.res.Resources;
import android.text.format.Time;

/**
 * General utility functions.
 * @author duncanw
 */
public class Util {
  
  /** 
   * @param delimiter the value separator, e.g "," to get a CSV string
   * @param values the values to join
   * @return e.g join(",", "one", "two", "three") returns "one,two,three".
   *         Null values will be included in the return value as empty strings,
   *         e.g join(",", "one", null, "three") returns "one,,three".
   */
  public static String join(String delimiter, Object...values) {

    return join(delimiter, Arrays.asList(values));
  }

  /** 
   * @param delimiter the value separator, e.g "," to get a CSV string
   * @param s the values to join
   * @return e.g join(",", ["one", "two", "three"]) returns "one,two,three".
   *         Null values will be included in the return value as empty strings,
   *         e.g join(",", ["one", null, "three"]) returns "one,,three".
   */
  public static String join(String delimiter, Collection<?> s) {
    StringBuilder builder = new StringBuilder();
    Iterator<?> iter = s.iterator();
    while (iter.hasNext()) {
      Object value = iter.next();
      if (value != null) {
        builder.append(value);
      }
      if (!iter.hasNext()) {
        break;
      }
      builder.append(delimiter);
    }
    return builder.toString();
  }
  
  /**
   * @param d a Float or Double
   * @return the empty string if d is null, otherwise d rounded to 4 decimal places with half-even rounding
   *         (Rounded towards the "nearest neighbour" unless both neighbours are equidistant, in which case, 
   *          round towards the even neighbour).
   */
  public static String format(Number d) {
    if (d == null) {
      return "";
    } else {
      return new DecimalFormat("#.####").format(d);
    }
  }
  
  /**
   * Copies a file.
   * @param src source file to copy.
   * @param dst destination file to copy to.
   * @throws IOException
   */
  public static void copy(File src, File dst) throws IOException {
    copy(new FileInputStream(src), new FileOutputStream(dst));
  }
  
  /**
   * Copies a resource to a file.
   * @param resources the app's resources, e.g from myActivity.getResources()
   * @param resourceId id of the resource to copy, e.g R.drawable.my_image
   * @param dst destination file to copy to.
   * @throws IOException
   */
    public static void copy(Resources resources, int resourceId, File dst) throws IOException {
        
       copy(resources.openRawResource(resourceId), new FileOutputStream(dst));
        
    }
    
    /**
     * Copies data from in to out until exhausted, then closes both streams.
     * @param in source.
     * @param out destination.
     * @throws IOException
     */
    public static void copy(InputStream in, OutputStream out) throws IOException {

      try {
          // Transfer bytes from in to out
          byte[] buf = new byte[1024];
          int len;
          while ((len = in.read(buf)) > 0) {
              out.write(buf, 0, len);
          }
      } finally {
        in.close();
        out.close();
      }
    }

    /**
     * @return the current date in the tablet's local timezone, in yyyyMMddHHmmss format.
     */
    public static String getTimestampSeconds() {
        Time now = new Time(Time.getCurrentTimezone());
         now.set(System.currentTimeMillis());
    return now.format("%Y%m%d%H%M%S");  
    }
    
    /**
     * @return the current date in the tablet's local timezone, in yyyyMMddHHmmssSSS format.
     */
    public static String getTimestampMillis() {

      // Locale.US just ensures we only deal in ASCII characters
      SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmssSSS", Locale.US);
      return formatter.format(new java.util.Date());  
    }
  
}

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