org.apache.jackrabbit.util
Class Text

java.lang.Object
  org.apache.jackrabbit.util.Text

public class Text

extends Object

This Class provides some text related utilities

Field Summary

static char[]	hexTable used for the md5
static BitSet	URISave The list of characters that are not encoded by the escape() and unescape() METHODS.
static BitSet	URISaveEx Same as URISave but also contains the '/'

Method Summary

static String	digest(String algorithm, byte[] data) Digest the plain string using the given algorithm.
static String	digest(String algorithm, String data, String enc) Digest the plain string using the given algorithm.
static String	encodeIllegalXMLCharacters(String text) Replaces illegal XML characters in the given string by their corresponding predefined entity references.
static String	escape(String string) Does a URL encoding of the string.
static String	escape(String string, char escape) Does an URL encoding of the string using the escape character.
static String	escape(String string, char escape, boolean isPath) Does an URL encoding of the string using the escape character.
static String	escapePath(String path) Does a URL encoding of the path.
static String[]	explode(String str, int ch) returns an array of strings decomposed of the original string, split at every occurance of 'ch'.
static String[]	explode(String str, int ch, boolean respectEmpty) returns an array of strings decomposed of the original string, split at every occurance of 'ch'.
static String	getAbsoluteParent(String path, int level) Returns the nth absolute parent of the path, where n=level.
static String	getLocalName(String qname) Returns the local name of the given qname.
static String	getName(String path) Returns the name part of the path
static String	getName(String path, char delim) Returns the name part of the path, delimited by the given delim
static String	getNamespacePrefix(String qname) Returns the namespace prefix of the given qname.
static String	getRelativeParent(String path, int level) Returns the nth relative parent of the path, where n=level.
static String	implode(String[] arr, String delim) Concatenates all strings in the string array using the specified delimiter.
static boolean	isDescendant(String path, String descendant) Determines if the descendant path is hierarchical a descendant of path.
static boolean	isDescendantOrEqual(String path, String descendant) Determines if the descendant path is hierarchical a descendant of path or equal to it.
static boolean	isSibling(String p1, String p2) Determines, if two paths denote hierarchical siblins.
static String	md5(String data) Calculate an MD5 hash of the string given using 'utf-8' encoding.
static String	md5(String data, String enc) Calculate an MD5 hash of the string given.
static String	replace(String text, String oldString, String newString) Replaces all occurences of oldString in text with newString.
static String	replaceVariables(Properties variables, String value, boolean ignoreMissing) Performs variable replacement on the given string value.
static String	unescape(String string) Does a URL decoding of the string.
static String	unescape(String string, char escape) Does a URL decoding of the string using the escape character.

Methods inherited from class java.lang.Object

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

Field Detail

hexTable

public static final char[] hexTable

used for the md5

URISave

public static BitSet URISave

The list of characters that are not encoded by the escape() and unescape() METHODS. They contains the characters as defined 'unreserved' in section 2.3 of the RFC 2396 'URI generic syntax':

 unreserved  = alphanum | mark
 mark        = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
 

URISaveEx

public static BitSet URISaveEx

Same as URISave but also contains the '/'

Method Detail

md5

public static String md5(String data,
                         String enc)
                  throws UnsupportedEncodingException

Calculate an MD5 hash of the string given.

Parameters:

data - the data to encode

enc - the character encoding to use

Returns:

a hex encoded string of the md5 digested input

Throws:

UnsupportedEncodingException

md5

public static String md5(String data)

Calculate an MD5 hash of the string given using 'utf-8' encoding.

Parameters:

data - the data to encode

Returns:

a hex encoded string of the md5 digested input

digest

public static String digest(String algorithm,
                            String data,
                            String enc)
                     throws NoSuchAlgorithmException,
                            UnsupportedEncodingException

Digest the plain string using the given algorithm.

Parameters:

algorithm - The alogrithm for the digest. This algorithm must be supported by the MessageDigest class.

data - The plain text String to be digested.

enc - The character encoding to use

Returns:

The digested plain text String represented as Hex digits.

Throws:

NoSuchAlgorithmException - if the desired algorithm is not supported by the MessageDigest class.

UnsupportedEncodingException - if the encoding is not supported

digest

public static String digest(String algorithm,
                            byte[] data)
                     throws NoSuchAlgorithmException

Digest the plain string using the given algorithm.

Parameters:

algorithm - The alogrithm for the digest. This algorithm must be supported by the MessageDigest class.

data - the data to digest with the given algorithm

Returns:

The digested plain text String represented as Hex digits.

Throws:

NoSuchAlgorithmException - if the desired algorithm is not supported by the MessageDigest class.

explode

public static String[] explode(String str,
                               int ch)

returns an array of strings decomposed of the original string, split at every occurance of 'ch'. if 2 'ch' follow each other with no intermediate characters, empty "" entries are avoided.

Parameters:

str - the string to decompose

ch - the character to use a split pattern

Returns:

an array of strings

explode

public static String[] explode(String str,
                               int ch,
                               boolean respectEmpty)

returns an array of strings decomposed of the original string, split at every occurance of 'ch'.

Parameters:

str - the string to decompose

ch - the character to use a split pattern

respectEmpty - if true, empty elements are generated

Returns:

an array of strings

implode

public static String implode(String[] arr,
                             String delim)

Concatenates all strings in the string array using the specified delimiter.

Parameters:

arr -

delim -

Returns:

the concatenated string

replace

public static String replace(String text,
                             String oldString,
                             String newString)

Replaces all occurences of oldString in text with newString.

Parameters:

text -

oldString - old substring to be replaced with newString

newString - new substring to replace occurences of oldString

Returns:

a string

encodeIllegalXMLCharacters

public static String encodeIllegalXMLCharacters(String text)

Replaces illegal XML characters in the given string by their corresponding predefined entity references.

Parameters:

text - text to be escaped

Returns:

a string

escape

public static String escape(String string,
                            char escape)

Does an URL encoding of the string using the escape character. The characters that don't need encoding are those defined 'unreserved' in section 2.3 of the 'URI generic syntax' RFC 2396, but without the escape character.

Parameters:

string - the string to encode.

escape - the escape character.

Returns:

the escaped string

Throws:

NullPointerException - if string is null.

escape

public static String escape(String string,
                            char escape,
                            boolean isPath)

Does an URL encoding of the string using the escape character. The characters that don't need encoding are those defined 'unreserved' in section 2.3 of the 'URI generic syntax' RFC 2396, but without the escape character. If isPath is true, additionally the slash '/' is ignored, too.

Parameters:

string - the string to encode.

escape - the escape character.

isPath - if true, the string is treated as path

Returns:

the escaped string

Throws:

NullPointerException - if string is null.

escape

public static String escape(String string)

Does a URL encoding of the string. The characters that don't need encoding are those defined 'unreserved' in section 2.3 of the 'URI generic syntax' RFC 2396.

Parameters:

string - the string to encode

Returns:

the escaped string

Throws:

NullPointerException - if string is null.

escapePath

public static String escapePath(String path)

Does a URL encoding of the path. The characters that don't need encoding are those defined 'unreserved' in section 2.3 of the 'URI generic syntax' RFC 2396. In contrast to the escape(String) method, not the entire path string is escaped, but every individual part (i.e. the slashes are not escaped).

Parameters:

path - the path to encode

Returns:

the escaped path

Throws:

NullPointerException - if path is null.

unescape

public static String unescape(String string,
                              char escape)

Does a URL decoding of the string using the escape character. Please note that in opposite to the URLDecoder it does not transform the + into spaces.

Parameters:

string - the string to decode

escape - the escape character

Returns:

the decoded string

Throws:

NullPointerException - if string is null.

ArrayIndexOutOfBoundsException - if not enough character follow an escape character

IllegalArgumentException - if the 2 characters following the escape character do not represent a hex-number.

unescape

public static String unescape(String string)

Does a URL decoding of the string. Please note that in opposite to the URLDecoder it does not transform the + into spaces.

Parameters:

string - the string to decode

Returns:

the decoded string

Throws:

NullPointerException - if string is null.

ArrayIndexOutOfBoundsException - if not enough character follow an escape character

IllegalArgumentException - if the 2 characters following the escape character do not represent a hex-number.

getName

public static String getName(String path)

Returns the name part of the path

Parameters:

path - the path

Returns:

the name part

getNamespacePrefix

public static String getNamespacePrefix(String qname)

Returns the namespace prefix of the given qname. If the prefix is missing, an empty string is returned. Please note, that this method does not validate the name or prefix.

the qname has the format: qname := [prefix ':'] local;

Parameters:

qname - a qualified name

Returns:

the prefix of the name or "".

Throws:

NullPointerException - if qname is null

See Also:

getLocalName(String)

getLocalName

public static String getLocalName(String qname)

Returns the local name of the given qname. Please note, that this method does not validate the name.

the qname has the format: qname := [prefix ':'] local;

Parameters:

qname - a qualified name

Returns:

the localname

Throws:

NullPointerException - if qname is null

See Also:

getNamespacePrefix(String)

getName

public static String getName(String path,
                             char delim)

Returns the name part of the path, delimited by the given delim

Parameters:

path - the path

delim - the delimiter

Returns:

the name part

isSibling

public static boolean isSibling(String p1,
                                String p2)

Determines, if two paths denote hierarchical siblins.

Parameters:

p1 - first path

p2 - second path

Returns:

true if on same level, false otherwise

isDescendant

public static boolean isDescendant(String path,
                                   String descendant)

Determines if the descendant path is hierarchical a descendant of path.

Parameters:

path - the current path

descendant - the potential descendant

Returns:

true if the descendant is a descendant; false otherwise.

isDescendantOrEqual

public static boolean isDescendantOrEqual(String path,
                                          String descendant)

Determines if the descendant path is hierarchical a descendant of path or equal to it.

Parameters:

path - the path to check

descendant - the potential descendant

Returns:

true if the descendant is a descendant or equal; false otherwise.

getRelativeParent

public static String getRelativeParent(String path,
                                       int level)

Returns the n^th relative parent of the path, where n=level.

Example:
Text.getRelativeParent("/foo/bar/test", 1) == "/foo/bar"

Parameters:

path - the path of the page

level - the level of the parent

getAbsoluteParent

public static String getAbsoluteParent(String path,
                                       int level)

Returns the n^th absolute parent of the path, where n=level.

Example:
Text.getAbsoluteParent("/foo/bar/test", 1) == "/foo/bar"

Parameters:

path - the path of the page

level - the level of the parent

replaceVariables

public static String replaceVariables(Properties variables,
                                      String value,
                                      boolean ignoreMissing)
                               throws IllegalArgumentException

Performs variable replacement on the given string value. Each ${...} sequence within the given value is replaced with the value of the named parser variable. If a variable is not found in the properties an IllegalArgumentException is thrown unless ignoreMissing is true. In the later case, the missing variable is replaced by the empty string.

Parameters:

value - the original value

ignoreMissing - if true, missing variables are replaced by the empty string.

Returns:

value after variable replacements

Throws:

IllegalArgumentException - if the replacement of a referenced variable is not found