Class DataUtils

java.lang.Object
de.erichseifert.vectorgraphics2d.util.DataUtils
public abstract class DataUtils extends Object
Abstract class that contains utility functions for working with data collections like maps or lists.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private static final DecimalFormat
    DOUBLE_FORMAT
    Standard pattern to format numbers
    private static final DecimalFormat
    FLOAT_FORMAT
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    DataUtils()
    Default constructor that prevents creation of class.

  • Method Summary

    Modifier and Type
    Method
    Description
    static List<Double>
    asList(double[] elements)
    Converts an array of double numbers to a list of Doubles.
    static List<Float>
    asList(float[] elements)
    Converts an array of float numbers to a list of Floats.
    static String
    format(Number number)
    Returns a formatted string of the specified number.
    static String
    format(Object obj)
    Returns a formatted string of the specified object.
    static String
    join(String separator, double[] elements)
    Returns a string containing all double numbers concatenated by a specified separator.
    static String
    join(String separator, float[] elements)
    Returns a string containing all float numbers concatenated by a specified separator.
    static String
    join(String separator, Object[] elements)
    Returns a string containing all elements concatenated by a specified separator.
    static String
    join(String separator, List<?> elements)
    Returns a string containing all elements concatenated by a specified separator.
    static <K,V> Map<K,V>
    map(K[] keys, V[] values)
    Creates a mapping from two arrays, one with keys, one with values.
    static int
    max(int... values)
    Returns the largest of all specified values.
    static String
    stripTrailing(String s, String substr)
    Removes the specified trailing pattern from a string.
    static void
    transfer(InputStream in, OutputStream out, int bufferSize)
    Copies data from an input stream to an output stream using a buffer of specified size.

    Methods inherited from class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • DOUBLE_FORMAT

      private static final DecimalFormat DOUBLE_FORMAT
      Standard pattern to format numbers

    • FLOAT_FORMAT

      private static final DecimalFormat FLOAT_FORMAT

  • Constructor Details

    • DataUtils

      DataUtils()
      Default constructor that prevents creation of class.

  • Method Details

    • map

      public static <K,V> Map<K,V> map(K[] keys, V[] values)
      Creates a mapping from two arrays, one with keys, one with values.
      Type Parameters:
      K - Data type of the keys.
      V - Data type of the values.
      Parameters:
      keys - Array containing the keys.
      values - Array containing the values.
      Returns:
      Map with keys and values from the specified arrays.

    • join

      public static String join(String separator, List<?> elements)
      Returns a string containing all elements concatenated by a specified separator.
      Parameters:
      separator - Separator string.
      elements - List of elements that should be concatenated.
      Returns:
      a concatenated string.

    • join

      public static String join(String separator, Object[] elements)
      Returns a string containing all elements concatenated by a specified separator.
      Parameters:
      separator - Separator string.
      elements - Array of elements that should be concatenated.
      Returns:
      a concatenated string.

    • join

      public static String join(String separator, double[] elements)
      Returns a string containing all double numbers concatenated by a specified separator.
      Parameters:
      separator - Separator string.
      elements - Array of double numbers that should be concatenated.
      Returns:
      a concatenated string.

    • join

      public static String join(String separator, float[] elements)
      Returns a string containing all float numbers concatenated by a specified separator.
      Parameters:
      separator - Separator string.
      elements - Array of float numbers that should be concatenated.
      Returns:
      a concatenated string.

    • max

      public static int max(int... values)
      Returns the largest of all specified values.
      Parameters:
      values - Several integer values.
      Returns:
      largest value.

    • transfer

      public static void transfer(InputStream in, OutputStream out, int bufferSize) throws IOException
      Copies data from an input stream to an output stream using a buffer of specified size.
      Parameters:
      in - Input stream.
      out - Output stream.
      bufferSize - Size of the copy buffer.
      Throws:
      IOException - when an error occurs while copying.

    • format

      public static String format(Number number)
      Returns a formatted string of the specified number. All trailing zeroes or decimal points will be stripped.
      Parameters:
      number - Number to convert to a string.
      Returns:
      A formatted string.

    • format

      public static String format(Object obj)
      Returns a formatted string of the specified object.
      Parameters:
      obj - Object to convert to a string.
      Returns:
      A formatted string.

    • asList

      public static List<Float> asList(float[] elements)
      Converts an array of float numbers to a list of Floats. The list will be empty if the array is empty or null.
      Parameters:
      elements - Array of float numbers.
      Returns:
      A list with all numbers as Float.

    • asList

      public static List<Double> asList(double[] elements)
      Converts an array of double numbers to a list of Doubles. The list will be empty if the array is empty or null.
      Parameters:
      elements - Array of double numbers.
      Returns:
      A list with all numbers as Double.

    • stripTrailing

      public static String stripTrailing(String s, String substr)
      Removes the specified trailing pattern from a string.
      Parameters:
      s - string.
      substr - trailing pattern.
      Returns:
      A string without the trailing pattern.