com.gigaspaces.internal.utils

Class StringUtils

java.lang.Object

com.gigaspaces.internal.utils.StringUtils

public abstract class StringUtils
extends Object

Miscellaneous string utility methods. Mainly for internal use within the framework; consider Jakarta's Commons Lang for a more comprehensive suite of string utilities.

This class delivers some simple functionality that should really be provided by the core Java String and StringBuffer classes, such as the ability to replace all occurrences of a given substring in a target string. It also provides easy-to-use methods to convert between delimited strings, such as CSV strings, and collections and arrays.

Author:

kimchy

Field Summary

Fields

Modifier and Type	Field and Description
static String	FOLDER_SEPARATOR
static String	FORMAT_TIME_STAMP
static String	NEW_LINE

Constructor Summary

Constructors

Constructor and Description
StringUtils()

Method Summary

Modifier and Type	Method and Description
static void	appendProperties(StringBuilder sb, Properties properties)
static String	arrayToCommaDelimitedString(Object[] arr) Convenience method to return a String array as a CSV String.
static String	arrayToDelimitedString(Object[] arr, String delim) Convenience method to return a String array as a delimited (e.g.
static String	collectionToCommaDelimitedString(Collection<String> coll) Convenience method to return a Collection as a CSV String.
static String	collectionToDelimitedString(Collection<String> coll, String delim) Convenience method to return a Collection as a delimited (e.g.
static String	collectionToDelimitedString(Collection<String> coll, String delim, String prefix, String suffix) Convenience method to return a Collection as a delimited (e.g.
static String[]	commaDelimitedListToStringArray(String str) Convert a CSV list into an array of Strings.
static Map<String,String>	convertArrayToKeyValuePairs(String[] pairs, String keyValueSeperator)
static Set<String>	convertArrayToSet(String[] array) Transforms array of String objects to Set
static String[]	convertKeyValuePairsToArray(Map<String,String> value, String keyValueSeperator)
static int	countOccurrencesOf(String s, char c) Count the occurrences of the character c in string s.
static String[]	delimitedListToStringArray(String str, String delimiter) Take a String which is a delimited list and convert it to a String array.
static boolean	endsWithIgnoreCase(String str, String suffix) Test if the given String ends with the specified suffix, ignoring upper/lower case.
static boolean	equalsIgnoreCase(String str1, String str2)
static String	getCurrentStackTrace()
static Set<String>	getParametersSet(String locatorsStr) Transforms string with elements separated by "," to Set of elements
static String	getSuffix(String s, String separator)
static String	getTimeStamp()
static String	getTimeStamp(long timeInMillis)
static boolean	hasLength(String str) Check if a String has length.
static boolean	hasText(String str) Check if a String has text.
static int	indexOfIgnoreCase(String str1, String str2)
static boolean	isEmpty(String str)
static boolean	isStrictPrefix(String s, String prefix)
static String	join(Collection<String> collection, String separator)
static String	join(String[] array, String delimiter, int firstIndex, int count)
static boolean	startsWithIgnoreCase(String str, String prefix) Test if the given String starts with the specified prefix, ignoring upper/lower case.
static String[]	tokenizeToStringArray(String str, String delimiters) Tokenize the given String into a String array via a StringTokenizer.
static String[]	tokenizeToStringArray(String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens) Tokenize the given String into a String array via a StringTokenizer.
static List<String>	toList(String s, String delimiter)
static Properties	toProperties(String s, String propertyDelimiter, String keyValueSeparator)
static String[]	toStringArray(Collection<String> collection) Copy the given Collection into a String array.
static String	trimToNull(String s)

Methods inherited from class java.lang.Object

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

Field Detail

FOLDER_SEPARATOR

public static final String FOLDER_SEPARATOR

See Also:

Constant Field Values

NEW_LINE

public static final String NEW_LINE

FORMAT_TIME_STAMP

public static String FORMAT_TIME_STAMP

Constructor Detail

StringUtils

public StringUtils()

Method Detail

isEmpty

public static boolean isEmpty(String str)

hasLength

public static boolean hasLength(String str)

Check if a String has length.

 StringUtils.hasLength(null) = false
 StringUtils.hasLength("") = false
 StringUtils.hasLength(" ") = true
 StringUtils.hasLength("Hello") = true
 

Parameters:

str - the String to check, may be null

Returns:

true if the String is not null and has length

hasText

public static boolean hasText(String str)

Check if a String has text. More specifically, returns true if the string not null, it's length is > 0, and it has at least one non-whitespace character.

 StringUtils.hasText(null) = false
 StringUtils.hasText("") = false
 StringUtils.hasText(" ") = false
 StringUtils.hasText("12345") = true
 StringUtils.hasText(" 12345 ") = true
 

Parameters:

str - the String to check, may be null

Returns:

true if the String is not null, length > 0, and not whitespace only

See Also:

Character.isWhitespace(char)

equalsIgnoreCase

public static boolean equalsIgnoreCase(String str1,
                                       String str2)

startsWithIgnoreCase

public static boolean startsWithIgnoreCase(String str,
                                           String prefix)

Test if the given String starts with the specified prefix, ignoring upper/lower case.

Parameters:

str - the String to check

prefix - the prefix to look for

See Also:

String.startsWith(java.lang.String, int)

endsWithIgnoreCase

public static boolean endsWithIgnoreCase(String str,
                                         String suffix)

Test if the given String ends with the specified suffix, ignoring upper/lower case.

Parameters:

str - the String to check

suffix - the suffix to look for

See Also:

String.endsWith(java.lang.String)

indexOfIgnoreCase

public static int indexOfIgnoreCase(String str1,
                                    String str2)

countOccurrencesOf

public static int countOccurrencesOf(String s,
                                     char c)

Count the occurrences of the character c in string s.

Parameters:

s - String to scan.

c - Character to find and count.

Returns:

Number of occurrences of c in s.

toStringArray

public static String[] toStringArray(Collection<String> collection)

Copy the given Collection into a String array. The Collection must contain String elements only.

Parameters:

collection - the Collection to copy

Returns:

the String array (null if the Collection was null as well)

join

public static String join(String[] array,
                          String delimiter,
                          int firstIndex,
                          int count)

join

public static String join(Collection<String> collection,
                          String separator)

toList

public static List<String> toList(String s,
                                  String delimiter)

toProperties

public static Properties toProperties(String s,
                                      String propertyDelimiter,
                                      String keyValueSeparator)

tokenizeToStringArray

public static String[] tokenizeToStringArray(String str,
                                             String delimiters)

Tokenize the given String into a String array via a StringTokenizer. Trims tokens and omits empty tokens.

The given delimiters string is supposed to consist of any number of delimiter characters. Each of those characters can be used to separate tokens. A delimiter is always a single character; for multi-character delimiters, consider using delimitedListToStringArray

Parameters:

str - the String to tokenize

delimiters - the delimiter characters, assembled as String (each of those characters is individually considered as delimiter).

Returns:

an array of the tokens

See Also:

StringTokenizer, String.trim(), delimitedListToStringArray(java.lang.String, java.lang.String)

tokenizeToStringArray

public static String[] tokenizeToStringArray(String str,
                                             String delimiters,
                                             boolean trimTokens,
                                             boolean ignoreEmptyTokens)

Tokenize the given String into a String array via a StringTokenizer.

The given delimiters string is supposed to consist of any number of delimiter characters. Each of those characters can be used to separate tokens. A delimiter is always a single character; for multi-character delimiters, consider using delimitedListToStringArray

Parameters:

str - the String to tokenize

delimiters - the delimiter characters, assembled as String (each of those characters is individually considered as delimiter)

trimTokens - trim the tokens via String's trim

ignoreEmptyTokens - omit empty tokens from the result array (only applies to tokens that are empty after trimming; StringTokenizer will not consider subsequent delimiters as token in the first place).

Returns:

an array of the tokens

See Also:

StringTokenizer, String.trim(), delimitedListToStringArray(java.lang.String, java.lang.String)

delimitedListToStringArray

public static String[] delimitedListToStringArray(String str,
                                                  String delimiter)

Take a String which is a delimited list and convert it to a String array.

A single delimiter can consists of more than one character: It will still be considered as single delimiter string, rather than as bunch of potential delimiter characters - in contrast to tokenizeToStringArray.

Parameters:

str - the input String

delimiter - the delimiter between elements (this is a single delimiter, rather than a bunch individual delimiter characters)

Returns:

an array of the tokens in the list

See Also:

tokenizeToStringArray(java.lang.String, java.lang.String)

commaDelimitedListToStringArray

public static String[] commaDelimitedListToStringArray(String str)

Convert a CSV list into an array of Strings.

Parameters:

str - CSV list

Returns:

an array of Strings, or the empty array if s is null

arrayToDelimitedString

public static String arrayToDelimitedString(Object[] arr,
                                            String delim)

Convenience method to return a String array as a delimited (e.g. CSV) String. E.g. useful for toString() implementations.

Parameters:

arr - array to display. Elements may be of any type (toString will be called on each element).

delim - delimiter to use (probably a ",")

collectionToDelimitedString

public static String collectionToDelimitedString(Collection<String> coll,
                                                 String delim,
                                                 String prefix,
                                                 String suffix)

Convenience method to return a Collection as a delimited (e.g. CSV) String. E.g. useful for toString() implementations.

Parameters:

coll - Collection to display

delim - delimiter to use (probably a ",")

prefix - string to start each element with

suffix - string to end each element with

collectionToDelimitedString

public static String collectionToDelimitedString(Collection<String> coll,
                                                 String delim)

Convenience method to return a Collection as a delimited (e.g. CSV) String. E.g. useful for toString() implementations.

Parameters:

coll - Collection to display

delim - delimiter to use (probably a ",")

arrayToCommaDelimitedString

public static String arrayToCommaDelimitedString(Object[] arr)

Convenience method to return a String array as a CSV String. E.g. useful for toString() implementations.

Parameters:

arr - array to display. Elements may be of any type (toString will be called on each element).

collectionToCommaDelimitedString

public static String collectionToCommaDelimitedString(Collection<String> coll)

Convenience method to return a Collection as a CSV String. E.g. useful for toString() implementations.

Parameters:

coll - Collection to display

convertArrayToSet

public static Set<String> convertArrayToSet(String[] array)

Transforms array of String objects to Set

Parameters:

array - array of String instances

Returns:

set

getParametersSet

public static Set<String> getParametersSet(String locatorsStr)

Transforms string with elements separated by "," to Set of elements

Parameters:

locatorsStr - elements delimetered by ","

Returns:

set

appendProperties

public static void appendProperties(StringBuilder sb,
                                    Properties properties)

convertKeyValuePairsToArray

public static String[] convertKeyValuePairsToArray(Map<String,String> value,
                                                   String keyValueSeperator)

convertArrayToKeyValuePairs

public static Map<String,String> convertArrayToKeyValuePairs(String[] pairs,
                                                             String keyValueSeperator)

getTimeStamp

public static String getTimeStamp()

getTimeStamp

public static String getTimeStamp(long timeInMillis)

getSuffix

public static String getSuffix(String s,
                               String separator)

getCurrentStackTrace

public static String getCurrentStackTrace()

isStrictPrefix

public static boolean isStrictPrefix(String s,
                                     String prefix)

trimToNull

public static String trimToNull(String s)