Package org.elasticsearch.common

Class Strings

java.lang.Object

org.elasticsearch.common.Strings

public class Strings
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String[]	EMPTY_ARRAY
static java.util.Set<java.lang.Character>	INVALID_FILENAME_CHARS

Method Summary

Modifier and Type	Method	Description
static java.lang.String	arrayToCommaDelimitedString(java.lang.Object[] arr)	Convenience method to return a String array as a CSV String.
static java.lang.String	arrayToDelimitedString(java.lang.Object[] arr, java.lang.String delim)	Convenience method to return a String array as a delimited (e.g.
static void	arrayToDelimitedString(java.lang.Object[] arr, java.lang.String delim, java.lang.StringBuilder sb)
static java.lang.String	capitalize(java.lang.String str)	Capitalize a String, changing the first letter to upper case as per Character.toUpperCase(char).
static java.lang.String	cleanTruncate(java.lang.String s, int length)	Truncates string to a length less than length.
static java.lang.String	coalesceToEmpty(java.lang.String s)
static java.lang.String	collectionToCommaDelimitedString(java.lang.Iterable<?> coll)	Convenience method to return a Collection as a CSV String.
static java.lang.String	collectionToDelimitedString(java.lang.Iterable<?> coll, java.lang.String delim)	Convenience method to return a Collection as a delimited (e.g.
static java.lang.String	collectionToDelimitedString(java.lang.Iterable<?> coll, java.lang.String delim, java.lang.String prefix, java.lang.String suffix)	Convenience method to return a Collection as a delimited (e.g.
static void	collectionToDelimitedString(java.lang.Iterable<?> coll, java.lang.String delim, java.lang.String prefix, java.lang.String suffix, java.lang.StringBuilder sb)
static java.util.Set<java.lang.String>	commaDelimitedListToSet(java.lang.String str)	Convenience method to convert a CSV string list to a set.
static java.lang.String[]	commaDelimitedListToStringArray(java.lang.String str)	Convert a CSV list into an array of Strings.
static java.lang.String	delete(java.lang.String inString, java.lang.String pattern)	Delete all occurrences of the given substring.
static java.lang.String	deleteAny(java.lang.String inString, java.lang.String charsToDelete)	Delete any character in a given String.
static java.lang.String[]	delimitedListToStringArray(java.lang.String str, java.lang.String delimiter)	Take a String which is a delimited list and convert it to a String array.
static java.lang.String[]	delimitedListToStringArray(java.lang.String str, java.lang.String delimiter, java.lang.String charsToDelete)	Take a String which is a delimited list and convert it to a String array.
static java.lang.String	format1Decimals(double value, java.lang.String suffix)	Format the double value with a single decimal points, trimming trailing '.0'.
static boolean	hasLength(java.lang.CharSequence str)	Check that the given CharSequence is neither null nor of length 0.
static boolean	hasLength(java.lang.String str)	Check that the given String is neither null nor of length 0.
static boolean	hasLength(BytesReference bytesReference)	Check that the given BytesReference is neither null nor of length 0 Note: Will return true for a BytesReference that purely consists of whitespace.
static boolean	hasText(java.lang.CharSequence str)	Check whether the given CharSequence has actual text.
static boolean	hasText(java.lang.String str)	Check whether the given String has actual text.
static boolean	isAllOrWildcard(java.lang.String[] data)	If an array only consists of zero or one element, which is "*" or "_all" return an empty array which is usually used as everything
static boolean	isEmpty(java.lang.CharSequence str)	Check that the given CharSequence is either null or of length 0.
static boolean	isNullOrEmpty(java.lang.String s)
static java.lang.String	padStart(java.lang.String s, int minimumLength, char c)
static java.lang.String	quote(java.lang.String str)	Quote the given String with single quotes.
static java.lang.String	replace(java.lang.String inString, java.lang.String oldPattern, java.lang.String newPattern)	Replace all occurrences of a substring within a string with another string.
static void	spaceify(int spaces, java.lang.String from, java.lang.StringBuilder to)
static java.lang.String[]	split(java.lang.String toSplit, java.lang.String delimiter)	Split a String at the first occurrence of the delimiter.
static java.util.List<java.lang.String>	splitSmart(java.lang.String s, java.lang.String separator, boolean decode)	Splits a backslash escaped string on the separator.
static java.lang.String[]	splitStringByCommaToArray(java.lang.String s)	Split the specified string by commas to an array.
static java.lang.String	substring(java.lang.String s, int beginIndex, int endIndex)	Return substring(beginIndex, endIndex) that is impervious to string length.
static boolean	substringMatch(java.lang.CharSequence str, int index, java.lang.CharSequence substring)	Test whether the given string matches the given substring at the given index.
static java.util.Set<java.lang.String>	tokenizeByCommaToSet(java.lang.String s)	Tokenize the specified string by commas to a set, trimming whitespace and ignoring empty tokens.
static java.lang.String[]	tokenizeToStringArray(java.lang.String s, java.lang.String delimiters)	Tokenize the given String into a String array via a StringTokenizer.
static java.lang.String	toString(ToXContent toXContent)	Return a String that is the json representation of the provided ToXContent.
static java.lang.String	toString(ToXContent toXContent, boolean pretty, boolean human)	Return a String that is the json representation of the provided ToXContent.
static java.lang.String	toString(XContentBuilder xContentBuilder)	Returns a string representation of the builder (only applicable for text based xcontent).
static java.lang.String[]	toStringArray(java.util.Collection<java.lang.String> collection)	Copy the given Collection into a String array.
static byte[]	toUTF8Bytes(java.lang.CharSequence charSequence)
static byte[]	toUTF8Bytes(java.lang.CharSequence charSequence, org.apache.lucene.util.BytesRefBuilder spare)
static java.lang.String	trimLeadingCharacter(java.lang.String str, char leadingCharacter)	Trim all occurrences of the supplied leading character from the given String.
static boolean	validFileName(java.lang.String fileName)
static boolean	validFileNameExcludingAstrix(java.lang.String fileName)

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_ARRAY

public static final java.lang.String[] EMPTY_ARRAY

INVALID_FILENAME_CHARS

public static final java.util.Set<java.lang.Character> INVALID_FILENAME_CHARS

Method Detail

spaceify

public static void spaceify(int spaces,
                            java.lang.String from,
                            java.lang.StringBuilder to)
                     throws java.lang.Exception

Throws:

java.lang.Exception

splitSmart

public static java.util.List<java.lang.String> splitSmart(java.lang.String s,
                                                          java.lang.String separator,
                                                          boolean decode)

Splits a backslash escaped string on the separator.

Current backslash escaping supported:
\n \t \r \b \f are escaped the same as a Java String
Other characters following a backslash are produced verbatim (\c => c)

Parameters:

s - the string to split

separator - the separator to split on

decode - decode backslash escaping

hasLength

public static boolean hasLength(java.lang.CharSequence str)

Check that the given CharSequence is neither null nor of length 0. Note: Will return true for a CharSequence that purely consists of whitespace.

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

Parameters:

str - the CharSequence to check (may be null)

Returns:

true if the CharSequence is not null and has length

See Also:

hasText(String)

hasLength

public static boolean hasLength(BytesReference bytesReference)

Check that the given BytesReference is neither null nor of length 0 Note: Will return true for a BytesReference that purely consists of whitespace.

Parameters:

bytesReference - the BytesReference to check (may be null)

Returns:

true if the BytesReference is not null and has length

See Also:

hasLength(CharSequence)

hasLength

public static boolean hasLength(java.lang.String str)

Check that the given String is neither null nor of length 0. Note: Will return true for a String that purely consists of whitespace.

Parameters:

str - the String to check (may be null)

Returns:

true if the String is not null and has length

See Also:

hasLength(CharSequence)

isEmpty

public static boolean isEmpty(java.lang.CharSequence str)

Check that the given CharSequence is either null or of length 0. Note: Will return false for a CharSequence that purely consists of whitespace.

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

Parameters:

str - the CharSequence to check (may be null)

Returns:

true if the CharSequence is either null or has a zero length

hasText

public static boolean hasText(java.lang.CharSequence str)

Check whether the given CharSequence has actual text. More specifically, returns true if the string not null, its length is greater than 0, and it contains 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 CharSequence to check (may be null)

Returns:

true if the CharSequence is not null, its length is greater than 0, and it does not contain whitespace only

See Also:

Character.isWhitespace(char)

hasText

public static boolean hasText(java.lang.String str)

Check whether the given String has actual text. More specifically, returns true if the string not null, its length is greater than 0, and it contains at least one non-whitespace character.

Parameters:

str - the String to check (may be null)

Returns:

true if the String is not null, its length is greater than 0, and it does not contain whitespace only

See Also:

hasText(CharSequence)

trimLeadingCharacter

public static java.lang.String trimLeadingCharacter(java.lang.String str,
                                                    char leadingCharacter)

Trim all occurrences of the supplied leading character from the given String.

Parameters:

str - the String to check

leadingCharacter - the leading character to be trimmed

Returns:

the trimmed String

substringMatch

public static boolean substringMatch(java.lang.CharSequence str,
                                     int index,
                                     java.lang.CharSequence substring)

Test whether the given string matches the given substring at the given index.

Parameters:

str - the original string (or StringBuilder)

index - the index in the original string to start matching against

substring - the substring to match at the given index

replace

public static java.lang.String replace(java.lang.String inString,
                                       java.lang.String oldPattern,
                                       java.lang.String newPattern)

Replace all occurrences of a substring within a string with another string.

Parameters:

inString - String to examine

oldPattern - String to replace

newPattern - String to insert

Returns:

a String with the replacements

delete

public static java.lang.String delete(java.lang.String inString,
                                      java.lang.String pattern)

Delete all occurrences of the given substring.

Parameters:

inString - the original String

pattern - the pattern to delete all occurrences of

Returns:

the resulting String

deleteAny

public static java.lang.String deleteAny(java.lang.String inString,
                                         java.lang.String charsToDelete)

Delete any character in a given String.

Parameters:

inString - the original String

charsToDelete - a set of characters to delete. E.g. "az\n" will delete 'a's, 'z's and new lines.

Returns:

the resulting String

quote

public static java.lang.String quote(java.lang.String str)

Quote the given String with single quotes.

Parameters:

str - the input String (e.g. "myString")

Returns:

the quoted String (e.g. "'myString'"), or null if the input was null

capitalize

public static java.lang.String capitalize(java.lang.String str)

Capitalize a String, changing the first letter to upper case as per Character.toUpperCase(char). No other letters are changed.

Parameters:

str - the String to capitalize, may be null

Returns:

the capitalized String, null if null

validFileName

public static boolean validFileName(java.lang.String fileName)

validFileNameExcludingAstrix

public static boolean validFileNameExcludingAstrix(java.lang.String fileName)

toStringArray

public static java.lang.String[] toStringArray(java.util.Collection<java.lang.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 passed-in Collection was null)

tokenizeByCommaToSet

public static java.util.Set<java.lang.String> tokenizeByCommaToSet(java.lang.String s)

Tokenize the specified string by commas to a set, trimming whitespace and ignoring empty tokens.

Parameters:

s - the string to tokenize

Returns:

the set of tokens

splitStringByCommaToArray

public static java.lang.String[] splitStringByCommaToArray(java.lang.String s)

Split the specified string by commas to an array.

Parameters:

s - the string to split

Returns:

the array of split values

See Also:

String.split(String)

split

public static java.lang.String[] split(java.lang.String toSplit,
                                       java.lang.String delimiter)

Split a String at the first occurrence of the delimiter. Does not include the delimiter in the result.

Parameters:

toSplit - the string to split

delimiter - to split the string up with

Returns:

a two element array with index 0 being before the delimiter, and index 1 being after the delimiter (neither element includes the delimiter); or null if the delimiter wasn't found in the given input String

tokenizeToStringArray

public static java.lang.String[] tokenizeToStringArray(java.lang.String s,
                                                       java.lang.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:

s - 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)

delimitedListToStringArray

public static java.lang.String[] delimitedListToStringArray(java.lang.String str,
                                                            java.lang.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)

delimitedListToStringArray

public static java.lang.String[] delimitedListToStringArray(java.lang.String str,
                                                            java.lang.String delimiter,
                                                            java.lang.String charsToDelete)

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)

charsToDelete - a set of characters to delete. Useful for deleting unwanted line breaks: e.g. "\r\n\f" will delete all new lines and line feeds in a String.

Returns:

an array of the tokens in the list

See Also:

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

commaDelimitedListToStringArray

public static java.lang.String[] commaDelimitedListToStringArray(java.lang.String str)

Convert a CSV list into an array of Strings.

Parameters:

str - the input String

Returns:

an array of Strings, or the empty array in case of empty input

commaDelimitedListToSet

public static java.util.Set<java.lang.String> commaDelimitedListToSet(java.lang.String str)

Convenience method to convert a CSV string list to a set. Note that this will suppress duplicates.

Parameters:

str - the input String

Returns:

a Set of String entries in the list

collectionToDelimitedString

public static java.lang.String collectionToDelimitedString(java.lang.Iterable<?> coll,
                                                           java.lang.String delim,
                                                           java.lang.String prefix,
                                                           java.lang.String suffix)

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

Parameters:

coll - the Collection to display

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

prefix - the String to start each element with

suffix - the String to end each element with

Returns:

the delimited String

collectionToDelimitedString

public static void collectionToDelimitedString(java.lang.Iterable<?> coll,
                                               java.lang.String delim,
                                               java.lang.String prefix,
                                               java.lang.String suffix,
                                               java.lang.StringBuilder sb)

collectionToDelimitedString

public static java.lang.String collectionToDelimitedString(java.lang.Iterable<?> coll,
                                                           java.lang.String delim)

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

Parameters:

coll - the Collection to display

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

Returns:

the delimited String

collectionToCommaDelimitedString

public static java.lang.String collectionToCommaDelimitedString(java.lang.Iterable<?> coll)

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

Parameters:

coll - the Collection to display

Returns:

the delimited String

arrayToDelimitedString

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

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

Parameters:

arr - the array to display

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

Returns:

the delimited String

arrayToDelimitedString

public static void arrayToDelimitedString(java.lang.Object[] arr,
                                          java.lang.String delim,
                                          java.lang.StringBuilder sb)

arrayToCommaDelimitedString

public static java.lang.String arrayToCommaDelimitedString(java.lang.Object[] arr)

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

Parameters:

arr - the array to display

Returns:

the delimited String

format1Decimals

public static java.lang.String format1Decimals(double value,
                                               java.lang.String suffix)

Format the double value with a single decimal points, trimming trailing '.0'.

toUTF8Bytes

public static byte[] toUTF8Bytes(java.lang.CharSequence charSequence)

toUTF8Bytes

public static byte[] toUTF8Bytes(java.lang.CharSequence charSequence,
                                 org.apache.lucene.util.BytesRefBuilder spare)

substring

public static java.lang.String substring(java.lang.String s,
                                         int beginIndex,
                                         int endIndex)

Return substring(beginIndex, endIndex) that is impervious to string length.

isAllOrWildcard

public static boolean isAllOrWildcard(java.lang.String[] data)

If an array only consists of zero or one element, which is "*" or "_all" return an empty array which is usually used as everything

toString

public static java.lang.String toString(ToXContent toXContent)

Return a String that is the json representation of the provided ToXContent. Wraps the output into an anonymous object if needed. The content is not pretty-printed nor human readable.

toString

public static java.lang.String toString(XContentBuilder xContentBuilder)

Returns a string representation of the builder (only applicable for text based xcontent).

Parameters:

xContentBuilder - builder containing an object to converted to a string

toString

public static java.lang.String toString(ToXContent toXContent,
                                        boolean pretty,
                                        boolean human)

Return a String that is the json representation of the provided ToXContent. Wraps the output into an anonymous object if needed. Allows to control whether the outputted json needs to be pretty printed and human readable.

cleanTruncate

public static java.lang.String cleanTruncate(java.lang.String s,
                                             int length)

Truncates string to a length less than length. Backtracks to throw out high surrogates.

isNullOrEmpty

public static boolean isNullOrEmpty(@Nullable
                                    java.lang.String s)

coalesceToEmpty

public static java.lang.String coalesceToEmpty(@Nullable
                                               java.lang.String s)

padStart

public static java.lang.String padStart(java.lang.String s,
                                        int minimumLength,
                                        char c)