StringUtil (Knowledgeplaza Java Utilities 1.19-SNAPSHOT API)

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nl.knowledgeplaza.util
Class StringUtil

java.lang.Object
  nl.knowledgeplaza.util.StringUtil

public class StringUtil
extends Object
extends Object

This class contains several String helper methods.

Version:: $Revision: 1.16 $
Author:: $Author: toeukpap $

Field Summary
`static String`	`FILTERCHARS_BACKSLASH`
`static String`	`FILTERCHARS_DIGITS`
`static String`	`FILTERCHARS_LOWERLETTERS`
`static String`	`FILTERCHARS_PUNCTUATION`
`static String`	`FILTERCHARS_QUOTES`
`static String`	`FILTERCHARS_UPPERLETTERS`
`static String`	`SOURCECODE_VERSION` Standard variable for determining version of a class file.

Constructor Summary
`StringUtil()`

Method Summary
`static String`	`byteArrayToString(byte[] ba)` Returns a byte array as a java string
`static String`	`byteArrayToString(byte[] ba, int offset, int len)` Returns a byte array as a java string
`static String`	`byteToHex(byte b)` Returns hex String representation of byte b
`static String`	`byteToHex(byte[] b)` Returns hex String representation of bytes b
`static String`	`charToHex(char c)` Returns hex String representation of char c
`static boolean`	`contains(String str, char chr)` Return true if the string contains the other character.
`static boolean`	`contains(String str, String sub)` Return true if the string contains the other string.
`static String`	`convertStandardTypesToString(Object o)`
`static Object`	`convertStringToStandardTypes(String s, Class c)`
`static int`	`count(String text, String pattern)` counts how many times the given pattern occurs in the given text.
`static int`	`countWords(String s, String delimiter)`
`static String`	`deleteChars(String str, String chars)` Delete all occurencies of certain characters in a string.
`static boolean`	`equalsTrueInSomeForm(String s)` all of "true", "yes" or "1", case insensitive and trimmed, are considered 'true'
`static boolean`	`equalsTrueInSomeForm(String s, boolean nullOrEmptyValue)` all of "true", "yes" or "1", case insensitive and trimmed, are considered 'true'
`static String`	`escapeForSQL(String in)` Helper function for escaping strings that should be used in SQL queries.
`static String`	`escapeHTML(String s)` Replaces characters that may be confused by a HTML parser with their equivalent character entity references.
`static String`	`escapeHTMLTag(String aTagFragment)` Replace characters having special meaning inside HTML tags with their escaped equivalents, using character entities such as `'&'`.
`static String`	`escapeJavaLiteral(String s)` Replaces characters that are not allowed in a Java style string literal with their escape characters.
`static String`	`escapeRegex(String aRegexFragment)` Replace characters having special meaning in regular expressions with their escaped equivalents.
`static String`	`escapeSQL(String s)` Replaces characters that may be confused by an SQL parser with their equivalent escape characters.
`static String`	`escapeString(String in)` Escape all String delimiter with \
`static String`	`escapeURL(String aURLFragment)` Synonym for `URLEncoder.encode(String, "UTF-8")`.
`static String`	`escapeXML(String text)` Escape characters for text appearing as XML data, between tags.
`static String`	`filter(String original, String filter)` Only allow those characters that are present in the filter filter("aAAcA-1%23", "ABCDEFGHIJKLMNOPQRSTIUVWXYZ1234567890") returns AAA123
`static String`	`filterChars(String from, String chars)` Leave any of the characters in chars in the string
`static String`	`firstCharacterLowercase(String s)` Make the first character lowercase
`static String`	`firstCharacterUppercase(String s)` Make the first character uppercase
`static String`	`firstWord(String s)`
`static String`	`flattenString(String in)` throw away all line feeds
`static String`	`fromJavaStringLiteral(String str)` Convert a backslash notation into a String (e.g. backslash-n as newline).
`static String`	`ifEmpty(String s, String d)` if s is null or length=0 return d else s
`static String`	`ifNull(String s, String d)` if s is null return d else s
`static String`	`insertAt(String s, int startIdx, String s2)` insert a piece into a string
`static boolean`	`isDecimal(String s)` Check if a string contains an decimal TODO improve implementation: http://rosettacode.org/wiki/Determine_if_a_string_is_numeric#Java
`static boolean`	`isEmpty(String s)` true if s is null or length=0
`static boolean`	`isEmptyWhitespace(String s)` true if s == null or trimmed length=0
`static boolean`	`isInteger(String s)` Check if a string contains an integer TODO improve implementation: http://rosettacode.org/wiki/Determine_if_a_string_is_numeric#Java
`static boolean`	`isMatch(String pattern, String string)` This method does a wildcard match (using * and ?)
`static boolean`	`isNotEmpty(String s)` true if s !
`static boolean`	`isNotEmptyWhitespace(String s)` true if s !
`static String`	`left(String aString, int len)` equivalent to the basic "left" function
`static String`	`makeCSV(String separator, String... values)` Generate a new string where each (empty or not) value is separated by the separator.
`static String`	`makeCSVOfNonEmpty(String separator, String... values)` Generate a new string where each non empty value is separated by the separator.
`static String`	`makeFirstLetterLowercase(String id)`
`static String`	`makeFirstLetterUppercase(String id)`
`static String`	`midpad(String s, int length)` Pad the beginning and end of the given String with spaces until the String is of the given length.
`static String`	`midpad(String s, int length, char c)` Pad the beginning and end of the given String with the given character until the result is the desired length.
`static int`	`nthIndexOfWord(String s, String word, int n)` return the index of the nth occurence of word. -1 if word can't be found n times
`static String`	`nthWord(String s, int nr, char delimiter)` return the nthWord delimited by a delimiter
`static String`	`postpad(String s, int length)` Pad the end of the given String with spaces until the String is of the given length.
`static String`	`postpad(String s, int length, char c)` Append the given character to the String until the result is the desired length.
`static String`	`prepad(String s, int length, char c)` Pre-pend the given character to the String until the result is the desired length.
`static String`	`pullToken(StringBuffer buf, String delim)` Remove a token from a the beginning of a `StringBuffer`, and return it.
`static String`	`removeChars(String from, String chars)` Remove any of the characters in chars from the string
`static String`	`removeSubstring(String s, int startIdx, int endIdx)` snip a portion from a string and return the remainder
`static String`	`repeat(String s, int n)` Repeat string S for N times
`static String`	`replace(String strReplaceInThis, String strReplaceThis, String strWithThis)` replace function for strings instead of chars
`static String`	`replace(String strReplaceInThis, String strReplaceThis, String strWithThis, int fromIdx, int toIdx)` Replace a substring in a string but only between the specified indexes (substring).
`static String`	`replaceFirst(String strReplaceInThis, String strReplaceThis, String strWithThis)` replace function for strings instead of chars, only replace first occurence
`static String`	`replaceSubstring(String s, int startIdx, int endIdx, String s2)` remove a piece from within a string and insert new at that location
`static String`	`reverse(String s)` reverse a string
`static String`	`right(String aString, int len)` equivalent to the basic "right" function
`static List<String>`	`splitOnTokens(String s, List<String> tokens, boolean includeTokens)` Split the string on any of the provided tokens This method is better than the tokenize methods in regard to ignoring empty fields.
`static List<String>`	`splitOnTokens(String s, String tokens, boolean includeTokens)` Split on each character
`static byte[]`	`stringToByteArray(String str)` Returns a java string as a byte array
`static byte[]`	`stringToByteArray(String str, int offset, int length)` Returns a java string as a byte array
`static String`	`subWords(String s, int start)` Get the string starting from the start'th word until end.
`static String`	`subWords(String s, int start, int end)` Get the string starting from the start'th word ending before the end'th word
`static String`	`toHexString(byte[] b)`
`static String`	`toJavaStringLiteral(String str, boolean useRaw)` Convert a String into backslash notation (e.g. newline as backslash-n).
`static String[]`	`tokenizeDelimitedToArray(String toBeDelimited, String delimiters)` Tokenize on each character This method has the known issues of Java's StringTokenizer (e.g. skipping empty values)
`static String[]`	`tokenizeDelimitedToArray(String toBeDelimited, String delimiters, boolean returnDelims)` Return an array of String from a String containing delimited values.
`static String`	`toRoman(int num)` Convert an integer to Roman notation
`static String`	`translate(String str, String fromChars, String toChars)` Translate characters in a string, like the t// operator in perl.
`static String`	`unescapeHTML(String s)` Turn any HTML escape entities in the string into characters and return the resulting string.
`static String`	`unescapeURL(String aURLFragment)` Synonym for `URLDecoder.decode(String, "UTF-8")`.
`static String`	`unescapeXML(String xml)` Escape characters for text appearing as XML data, between tags.
`static String`	`wrap(String text, int width)` lines may not be longer than X characters (words are cut)
`static String`	`wrapApproximate(String aString, int approximateWidth)` wraps a string to a maximum length by inserting newlines

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

SOURCECODE_VERSION

public static final String SOURCECODE_VERSION

Standard variable for determining version of a class file.

See Also:: Constant Field Values

FILTERCHARS_LOWERLETTERS

public static final String FILTERCHARS_LOWERLETTERS

See Also:: Constant Field Values

FILTERCHARS_UPPERLETTERS

public static final String FILTERCHARS_UPPERLETTERS

See Also:: Constant Field Values

FILTERCHARS_DIGITS

public static final String FILTERCHARS_DIGITS

See Also:: Constant Field Values

FILTERCHARS_PUNCTUATION

public static final String FILTERCHARS_PUNCTUATION

See Also:: Constant Field Values

FILTERCHARS_BACKSLASH

public static final String FILTERCHARS_BACKSLASH

See Also:: Constant Field Values

FILTERCHARS_QUOTES

public static final String FILTERCHARS_QUOTES

See Also:: Constant Field Values

Constructor Detail

StringUtil

public StringUtil()

Method Detail

tokenizeDelimitedToArray

public static String[] tokenizeDelimitedToArray(String toBeDelimited,
                                                String delimiters,
                                                boolean returnDelims)

Return an array of String from a String containing delimited values. For example "a,b,c" will return a String[3] {"a","b","c"}. Tokenize on each character This method has the known issues of Java's StringTokenizer (e.g. skipping empty values)

Parameters:: delimited - the String value to tokenize; delimiters - the delimiter ("," or ";" for example)
Returns:: an array of String delimited value

tokenizeDelimitedToArray

public static String[] tokenizeDelimitedToArray(String toBeDelimited,
                                                String delimiters)

Tokenize on each character This method has the known issues of Java's StringTokenizer (e.g. skipping empty values)

Parameters:: toBeDelimited -; delimiters -
Returns:

splitOnTokens

public static List<String> splitOnTokens(String s,
                                         List<String> tokens,
                                         boolean includeTokens)

Split the string on any of the provided tokens This method is better than the tokenize methods in regard to ignoring empty fields.

Parameters:: s - the string to be split; tokens - each string is used as a token (not its individual characters); includeTokens - include the tokens in the resulting segments
Returns:: list of all the segments

splitOnTokens

public static List<String> splitOnTokens(String s,
                                         String tokens,
                                         boolean includeTokens)

Split on each character

Parameters:: s -; tokens -; includeTokens -
Returns:

stringToByteArray

public static byte[] stringToByteArray(String str)

Returns a java string as a byte array

stringToByteArray

public static byte[] stringToByteArray(String str,
                                       int offset,
                                       int length)

Returns a java string as a byte array

byteArrayToString

public static String byteArrayToString(byte[] ba,
                                       int offset,
                                       int len)

Returns a byte array as a java string

byteArrayToString

public static String byteArrayToString(byte[] ba)

Returns a byte array as a java string

wrapApproximate

public static String wrapApproximate(String aString,
                                     int approximateWidth)

wraps a string to a maximum length by inserting newlines

Parameters:: aString -; approximateWidth -
Returns:

wrap

public static String wrap(String text,
                          int width)

lines may not be longer than X characters (words are cut)

left

public static String left(String aString,
                          int len)

equivalent to the basic "left" function

Parameters:: aString -; len -
Returns:

right

public static String right(String aString,
                           int len)

equivalent to the basic "right" function

Parameters:: aString -; len -
Returns:

replace

public static String replace(String strReplaceInThis,
                             String strReplaceThis,
                             String strWithThis)

replace function for strings instead of chars

Parameters:: strReplaceInThis - in this string; strReplaceThis - this orignal text; strWithThis - with this text
Returns:

replaceFirst

public static String replaceFirst(String strReplaceInThis,
                                  String strReplaceThis,
                                  String strWithThis)

replace function for strings instead of chars, only replace first occurence

Parameters:: strReplaceInThis - in this string; strReplaceThis - this orignal text; strWithThis - with this text
Returns:

replace

public static String replace(String strReplaceInThis,
                             String strReplaceThis,
                             String strWithThis,
                             int fromIdx,
                             int toIdx)

Replace a substring in a string but only between the specified indexes (substring).

Parameters:: strReplaceInThis -; strReplaceThis -; strWithThis -; fromIdx -; toIdx -
Returns:

escapeXML

public static String escapeXML(String text)

Escape characters for text appearing as XML data, between tags.

unescapeXML

public static String unescapeXML(String xml)

Escape characters for text appearing as XML data, between tags.

escapeURL

public static String escapeURL(String aURLFragment)

Synonym for URLEncoder.encode(String, "UTF-8").

Used to ensure that HTTP query strings are in proper form, by escaping special characters such as spaces.

An example use case for this method is a login scheme in which, after successful login, the user is redirected to the "original" target destination. Such a target might be passed around as a request parameter. Such a request parameter will have a URL as its value, as in "LoginTarget=Blah.jsp?this=that&blah=boo", and would need to be URL-encoded in order to escape its special characters.

It is important to note that if a query string appears in an HREF attribute, then there are two issues - ensuring the query string is valid HTTP (it is URL-encoded), and ensuring it is valid HTML (ensuring the ampersand is escaped).

unescapeURL

public static String unescapeURL(String aURLFragment)

Synonym for URLDecoder.decode(String, "UTF-8").

escapeHTMLTag

public static String escapeHTMLTag(String aTagFragment)

Replace characters having special meaning inside HTML tags with their escaped equivalents, using character entities such as '&'.

The escaped characters are :

Use cases for this method include :

render ineffective all HTML present in arbitrary text input by a user (in a message board, for example)
ensure that arbitrary text appearing inside a tag does not "confuse" the tag. For example, HREF='Blah.do?Page=1&Sort=ASC' does not comply with strict HTML because of the ampersand, and should be changed to HREF='Blah.do?Page=1&Sort=ASC'. This is commonly seen in building query strings. (In JSTL, the c:url tag performs this task automatically.)

escapeRegex

public static String escapeRegex(String aRegexFragment)

Replace characters having special meaning in regular expressions with their escaped equivalents.

The escaped characters include :

.
\
?, * , and +
&
:
{ and }
[ and ]
( and )
^ and $

escapeHTML

public static String escapeHTML(String s)

Replaces characters that may be confused by a HTML parser with their equivalent character entity references.

Any data that will appear as text on a web page should be be escaped. This is especially important for data that comes from untrusted sources such as Internet users. A common mistake in CGI programming is to ask a user for data and then put that data on a web page. For example:

 Server: What is your name?
 User: <b>Joe<b>
 Server: Hello Joe, Welcome

If the name is put on the page without checking that it doesn't contain HTML code or without sanitizing that HTML code, the user could reformat the page, insert scripts, and control the the content on your web server.

This method will replace HTML characters such as > with their HTML entity reference (>) so that the html parser will be sure to interpret them as plain text rather than HTML or script.

This method should be used for both data to be displayed in text in the html document, and data put in form elements. For example:
<html><body>This in not a <tag> in HTML</body></html>
and
<form><input type="hidden" name="date" value="This data could be "malicious""></form>
In the second example, the form data would be properly be resubmitted to your cgi script in the URLEncoded format:
This data could be %22malicious%22

Parameters:: s - String to be escaped
Returns:: escaped String
Throws:: NullPointerException - if s is null.

unescapeHTML

public static String unescapeHTML(String s)

Turn any HTML escape entities in the string into characters and return the resulting string.

Parameters:: s - String to be unescaped.
Returns:: unescaped String.
Throws:: NullPointerException - if s is null.
Since:: ostermillerutils 1.00.00

escapeSQL

public static String escapeSQL(String s)

Replaces characters that may be confused by an SQL parser with their equivalent escape characters.

Any data that will be put in an SQL query should be be escaped. This is especially important for data that comes from untrusted sources such as Internet users.

For example if you had the following SQL query:
"SELECT * FROM addresses WHERE name='" + name + "' AND private='N'"
Without this function a user could give " OR 1=1 OR ''='" as their name causing the query to be:
"SELECT * FROM addresses WHERE name='' OR 1=1 OR ''='' AND private='N'"
which will give all addresses, including private ones.
Correct usage would be:
"SELECT * FROM addresses WHERE name='" + StringHelper.escapeSQL(name) + "' AND private='N'"

Another way to avoid this problem is to use a PreparedStatement with appropriate placeholders.

Parameters:: s - String to be escaped
Returns:: escaped String
Throws:: NullPointerException - if s is null.

escapeJavaLiteral

public static String escapeJavaLiteral(String s)

Replaces characters that are not allowed in a Java style string literal with their escape characters. Specifically quote ("), single quote ('), new line (\n), carriage return (\r), and backslash (\), and tab (\t) are escaped.

Parameters:: s - String to be escaped
Returns:: escaped String, null if the input was null

prepad

public static String prepad(String s,
                            int length,
                            char c)

Pre-pend the given character to the String until the result is the desired length.

If a String is longer than the desired length, it will not be truncated, however no padding will be added. Most notably this can be used to generate leading zero's: prepad("" + some_int_being_one, 5, '0') results in "00001".

Parameters:: s - String to be padded.; length - desired length of result.; c - padding character.
Returns:: padded String.
Throws:: NullPointerException - if s is null.

postpad

public static String postpad(String s,
                             int length)

Pad the end of the given String with spaces until the String is of the given length.

If a String is longer than the desired length, it will not be truncated, however no padding will be added.

Parameters:: s - String to be padded.; length - desired length of result.
Returns:: padded String.
Throws:: NullPointerException - if s is null.

postpad

public static String postpad(String s,
                             int length,
                             char c)

Append the given character to the String until the result is the desired length.

If a String is longer than the desired length, it will not be truncated, however no padding will be added.

Parameters:: s - String to be padded.; length - desired length of result.; c - padding character.
Returns:: padded String.
Throws:: NullPointerException - if s is null.

midpad

public static String midpad(String s,
                            int length)

Pad the beginning and end of the given String with spaces until the String is of the given length. The result is that the original String is centered in the middle of the new string.

If the number of characters to pad is even, then the padding will be split evenly between the beginning and end, otherwise, the extra character will be added to the end.

If a String is longer than the desired length, it will not be truncated, however no padding will be added.

Parameters:: s - String to be padded.; length - desired length of result.
Returns:: padded String.
Throws:: NullPointerException - if s is null.

repeat

public static String repeat(String s,
                            int n)

Repeat string S for N times

Parameters:: s -; n -
Returns:

midpad

public static String midpad(String s,
                            int length,
                            char c)

Pad the beginning and end of the given String with the given character until the result is the desired length. The result is that the original String is centered in the middle of the new string.

If the number of characters to pad is even, then the padding will be split evenly between the beginning and end, otherwise, the extra character will be added to the end.

If a String is longer than the desired length, it will not be truncated, however no padding will be added.

Parameters:: s - String to be padded.; length - desired length of result.; c - padding character.
Returns:: padded String.
Throws:: NullPointerException - if s is null.

toHexString

public static String toHexString(byte[] b)

byteToHex

public static String byteToHex(byte b)

Returns hex String representation of byte b

Parameters:: b -
Returns:

byteToHex

public static String byteToHex(byte[] b)

Returns hex String representation of bytes b

Parameters:: b -
Returns:

charToHex

public static String charToHex(char c)

Returns hex String representation of char c

Parameters:: c -
Returns:

isMatch

public static boolean isMatch(String pattern,
                              String string)

This method does a wildcard match (using * and ?) on pattern with the given string. It returns true if the given string is represented by the given pattern.

Parameters:: pattern - the wildcard pattern to use; string - the string to check against pattern
Returns:: true if string represented by pattern, false else

subWords

public static String subWords(String s,
                              int start)

Get the string starting from the start'th word until end.

Parameters:: s - string that contains words separated by blanks

subWords

public static String subWords(String s,
                              int start,
                              int end)

Get the string starting from the start'th word ending before the end'th word

nthWord

public static String nthWord(String s,
                             int nr,
                             char delimiter)

return the nthWord delimited by a delimiter

firstWord

public static String firstWord(String s)

nthIndexOfWord

public static int nthIndexOfWord(String s,
                                 String word,
                                 int n)

return the index of the nth occurence of word. -1 if word can't be found n times

escapeString

public static String escapeString(String in)

Escape all String delimiter with \

escapeForSQL

public static String escapeForSQL(String in)

Helper function for escaping strings that should be used in SQL queries.

flattenString

public static String flattenString(String in)

throw away all line feeds

countWords

public static int countWords(String s,
                             String delimiter)

translate

public static String translate(String str,
                               String fromChars,
                               String toChars)

Translate characters in a string, like the t// operator in perl.

deleteChars

public static String deleteChars(String str,
                                 String chars)

Delete all occurencies of certain characters in a string.

pullToken

public static String pullToken(StringBuffer buf,
                               String delim)

Remove a token from a the beginning of a StringBuffer, and return it. The delim argument is a string of possible characters that may ends the token. This method does not return an empty ("") string - instead null is returned.

This is a "helper" method, should probably be found in some other class. Let me know if you find a suitable replacement.

Parameters:: buf - the line with words to remove a word from; delim - string of characters that may end token
Returns:: the removed leading token (null if no word available)

contains

public static boolean contains(String str,
                               String sub)

Return true if the string contains the other string.

This method is provided merely for improved code readability. It is equivalent to str.indexOf(sub) != -1.

contains

public static boolean contains(String str,
                               char chr)

Return true if the string contains the other character.

This method is provided merely for improved code readability. It is equivalent to str.indexOf(chr) != -1.

toJavaStringLiteral

public static String toJavaStringLiteral(String str,
                                         boolean useRaw)

Convert a String into backslash notation (e.g. newline as backslash-n).

Parameters:: str -; useRaw -
Returns:

fromJavaStringLiteral

public static String fromJavaStringLiteral(String str)

Convert a backslash notation into a String (e.g. backslash-n as newline).

Parameters:: str -; useRaw -
Returns:

filter

public static String filter(String original,
                            String filter)

Only allow those characters that are present in the filter filter("aAAcA-1%23", "ABCDEFGHIJKLMNOPQRSTIUVWXYZ1234567890") returns AAA123

Parameters:: original -; filter -
Returns:

replaceSubstring

public static String replaceSubstring(String s,
                                      int startIdx,
                                      int endIdx,
                                      String s2)

remove a piece from within a string and insert new at that location

Parameters:: s -; startIdx -; endIdx -
Returns:

removeSubstring

public static String removeSubstring(String s,
                                     int startIdx,
                                     int endIdx)

snip a portion from a string and return the remainder

Parameters:: s -; startIdx -; endIdx -
Returns:

insertAt

public static String insertAt(String s,
                              int startIdx,
                              String s2)

insert a piece into a string

Parameters:: s -; startIdx -; s2 -
Returns:

reverse

public static String reverse(String s)

reverse a string

toRoman

public static String toRoman(int num)

Convert an integer to Roman notation

Parameters:: num -
Returns:

convertStandardTypesToString

public static String convertStandardTypesToString(Object o)

Parameters:: s -; c -
Returns:

convertStringToStandardTypes

public static Object convertStringToStandardTypes(String s,
                                                  Class c)

Parameters:: s -; c -
Returns:

ifNull

public static String ifNull(String s,
                            String d)

if s is null return d else s

Parameters:: s -; d -
Returns:

ifEmpty

public static String ifEmpty(String s,
                             String d)

if s is null or length=0 return d else s

Parameters:: s -; d -
Returns:

isEmptyWhitespace

public static boolean isEmptyWhitespace(String s)

true if s == null or trimmed length=0

Parameters:: s -
Returns:

isNotEmptyWhitespace

public static boolean isNotEmptyWhitespace(String s)

true if s != null and trimmed length > 0

Parameters:: s -
Returns:

isEmpty

public static boolean isEmpty(String s)

true if s is null or length=0

Parameters:: s -
Returns:

isNotEmpty

public static boolean isNotEmpty(String s)

true if s != null and length > 0

Parameters:: s -
Returns:

removeChars

public static String removeChars(String from,
                                 String chars)

Remove any of the characters in chars from the string

Parameters:: from -; chars -

filterChars

public static String filterChars(String from,
                                 String chars)

Leave any of the characters in chars in the string

Parameters:: from -; chars -

equalsTrueInSomeForm

public static boolean equalsTrueInSomeForm(String s)

all of "true", "yes" or "1", case insensitive and trimmed, are considered 'true'

Parameters:: s -
Returns:: false unless found true

equalsTrueInSomeForm

public static boolean equalsTrueInSomeForm(String s,
                                           boolean nullOrEmptyValue)

all of "true", "yes" or "1", case insensitive and trimmed, are considered 'true'

Parameters:: s -; nullOrEmptyValue -
Returns:: null value if string is null or empty, true if string is a match, otherwise false

makeFirstLetterLowercase

public static String makeFirstLetterLowercase(String id)

Parameters:: id -
Returns:

makeFirstLetterUppercase

public static String makeFirstLetterUppercase(String id)

Parameters:: id -
Returns:

count

public static int count(String text,
                        String pattern)

counts how many times the given pattern occurs in the given text. Example: count("ababababab", "abab") returns 2.

firstCharacterUppercase

public static String firstCharacterUppercase(String s)

Make the first character uppercase

Parameters:: s -
Returns:

firstCharacterLowercase

public static String firstCharacterLowercase(String s)

Make the first character lowercase

Parameters:: s -
Returns:

makeCSVOfNonEmpty

public static String makeCSVOfNonEmpty(String separator,
                                       String... values)

Generate a new string where each non empty value is separated by the separator. Empty values are skipped

Parameters:: separator -; values -
Returns:

makeCSV

public static String makeCSV(String separator,
                             String... values)

Generate a new string where each (empty or not) value is separated by the separator.

Parameters:: separator -; values -
Returns:

isDecimal

public static boolean isDecimal(String s)

Check if a string contains an decimal TODO improve implementation: http://rosettacode.org/wiki/Determine_if_a_string_is_numeric#Java

Parameters:: s -
Returns:

isInteger

public static boolean isInteger(String s)

Check if a string contains an integer TODO improve implementation: http://rosettacode.org/wiki/Determine_if_a_string_is_numeric#Java

Parameters:: s -
Returns:

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nl.knowledgeplaza.util Class StringUtil

SOURCECODE_VERSION

FILTERCHARS_LOWERLETTERS

FILTERCHARS_UPPERLETTERS

FILTERCHARS_DIGITS

FILTERCHARS_PUNCTUATION

FILTERCHARS_BACKSLASH

FILTERCHARS_QUOTES

StringUtil

tokenizeDelimitedToArray

tokenizeDelimitedToArray

splitOnTokens

splitOnTokens

stringToByteArray

stringToByteArray

byteArrayToString

byteArrayToString

wrapApproximate

wrap

left

right

replace

replaceFirst

replace

escapeXML

unescapeXML

escapeURL

unescapeURL

escapeHTMLTag

escapeRegex

escapeHTML

unescapeHTML

escapeSQL

escapeJavaLiteral

prepad

postpad

postpad

midpad

repeat

midpad

toHexString

byteToHex

byteToHex

charToHex

isMatch

subWords

subWords

nthWord

firstWord

nthIndexOfWord

escapeString

escapeForSQL

flattenString

countWords

translate

deleteChars

pullToken

contains

contains

toJavaStringLiteral

fromJavaStringLiteral

filter

replaceSubstring

removeSubstring

insertAt

reverse

toRoman

convertStandardTypesToString

convertStringToStandardTypes

ifNull

ifEmpty

isEmptyWhitespace

isNotEmptyWhitespace

isEmpty

isNotEmpty

removeChars

filterChars

equalsTrueInSomeForm

equalsTrueInSomeForm

makeFirstLetterLowercase

nl.knowledgeplaza.util
Class StringUtil