com.jstatcom.util
Class UString

java.lang.Object
  com.jstatcom.util.UString

public final class UString
extends java.lang.Object

A collection of static methods that are related to strings and formatting.

Author:

Markus Kraetzig

Field Summary

static java.lang.String	NAN_STRING
static java.lang.String	NAN_STRING_ALT
static java.lang.String	NEGINF_STRING
static java.lang.String	POSINF_STRING
static java.lang.String	SIGPOSINF_STRING

Constructor Summary

UString()

Method Summary

static java.lang.String	capitalizeFirst(java.lang.String s) Resturns string with first characted capitalized, rest lowercase.
static java.lang.String	formatNumber(double number, java.text.NumberFormat format, int precision) Formats number with format if format !
static java.lang.Double	parseToNumber(java.lang.String text) Parses a given string to a Double if possible and returns it.
static java.lang.String	replaceAllSubStrings(java.lang.String origString, java.lang.String substring, java.lang.String replacementString) This method replaces all occurences of a substring in an original string with a replacement string.
static java.lang.String	replaceSubString(java.lang.String origString, java.lang.String substring, java.lang.String replacementString) This method replaces the first occurence of a substring in an original string with a replacement string.
static java.lang.String	replaceSubString(java.lang.String origString, java.lang.String substring, java.lang.String replacementString, int pos) This method replaces the first occurence of a substring in an original string with a replacement string, starting from a given position.

Methods inherited from class java.lang.Object

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

Field Detail

NAN_STRING

public static final java.lang.String NAN_STRING

See Also:

Constant Field Values

NAN_STRING_ALT

public static final java.lang.String NAN_STRING_ALT

See Also:

Constant Field Values

POSINF_STRING

public static final java.lang.String POSINF_STRING

See Also:

Constant Field Values

SIGPOSINF_STRING

public static final java.lang.String SIGPOSINF_STRING

See Also:

Constant Field Values

NEGINF_STRING

public static final java.lang.String NEGINF_STRING

See Also:

Constant Field Values

Constructor Detail

UString

public UString()

Method Detail

formatNumber

public static java.lang.String formatNumber(double number,
                                            java.text.NumberFormat format,
                                            int precision)

Formats number with format if format != null. Otherwise return number as a string. The formatter respects the given precision.

Parameters:

number - the double to format

format - the formatter, can be null

precision - number of digits right to the decimal point

Returns:

a formatted string with number

parseToNumber

public static java.lang.Double parseToNumber(java.lang.String text)

Parses a given string to a Double if possible and returns it. NaN, (+)Infinity, and -Infinity, are recognized. If the given string is empty, NaN is returned.

Parameters:

text - a string that should represent a number, scientific notation is recognized as well

Returns:

the assembled Double or null if something went wrong

Throws:

java.lang.IllegalArgumentException - if (text == null)

replaceAllSubStrings

public static java.lang.String replaceAllSubStrings(java.lang.String origString,
                                                    java.lang.String substring,
                                                    java.lang.String replacementString)

This method replaces all occurences of a substring in an original string with a replacement string. It does not work with regular expressions.

Parameters:

origString - the string to work on

substring - must occur completely in origString for the replacement to work

replacementString - the string with which substring is replaced

Returns:

a new string with the replacement(s) or
origString if any of the parameters is null, if substring is empty or if substring does not occur in origString

replaceSubString

public static java.lang.String replaceSubString(java.lang.String origString,
                                                java.lang.String substring,
                                                java.lang.String replacementString)

This method replaces the first occurence of a substring in an original string with a replacement string. It does not work with regular expressions.

Parameters:

origString - the string to work on

substring - must occur completely in origString for the replacement to work

replacementString - the string with which substring is replaced

Returns:

a new string with the replacement or
origString if any of the parameters is null, if substring is empty or if substring does not occur in origString

replaceSubString

public static java.lang.String replaceSubString(java.lang.String origString,
                                                java.lang.String substring,
                                                java.lang.String replacementString,
                                                int pos)

This method replaces the first occurence of a substring in an original string with a replacement string, starting from a given position. It does not work with regular expressions.

Parameters:

origString - the string to work on

substring - must occur completely in origString for the replacement to work

replacementString - the string with which substring is replaced

pos - the index in origString to start searching for substring, if < 0 pos is set to 0

Returns:

a new string with the replacement or
origString if any of the parameters is null, if substring is empty or if substring does not occur in origString or if pos >= origString.length()

capitalizeFirst

public static java.lang.String capitalizeFirst(java.lang.String s)

Resturns string with first characted capitalized, rest lowercase. Useful for names.

Parameters:

s -

Returns:

string with first char upper case, rest lowercase or null if s == null