de.erichseifert.vectorgraphics2d.util

Class DataUtils

java.lang.Object

de.erichseifert.vectorgraphics2d.util.DataUtils

public abstract class DataUtils
extends java.lang.Object

Abstract class that contains utility functions for working with data collections like maps or lists.

Method Summary

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

Methods inherited from class java.lang.Object

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

Method Detail

map

public static <K,V> java.util.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 java.lang.String join(java.lang.String separator,
                                    java.util.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 java.lang.String join(java.lang.String separator,
                                    java.lang.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 java.lang.String join(java.lang.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 java.lang.String join(java.lang.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(java.io.InputStream in,
                            java.io.OutputStream out,
                            int bufferSize)
                     throws java.io.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:

java.io.IOException - when an error occurs while copying.

format

public static java.lang.String format(java.lang.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 java.lang.String format(java.lang.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 java.util.List<java.lang.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 java.util.List<java.lang.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 java.lang.String stripTrailing(java.lang.String s,
                                             java.lang.String substr)

Removes the specified trailing pattern from a string.

Parameters:

s - string.

substr - trailing pattern.

Returns:

A string without the trailing pattern.