org.eclipse.jetty.util

## Class StringUtil

- java.lang.Object
- - org.eclipse.jetty.util.StringUtil

-     public class StringUtil
      extends Object

  Fast String Utilities. These string utilities provide both conveniance methods and performance improvements over most standard library versions. The main aim of the optimizations is to avoid object creation unless absolutely required.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `__ISO_8859_1`
    `static Charset` | `__ISO_8859_1_CHARSET`
    `static String` | `__LINE_SEPARATOR`
    `static String` | `__UTF16`
    `static String` | `__UTF8`
    `static Charset` | `__UTF8_CHARSET`
    `static String` | `__UTF8Alt`
    `static String` | `ALL_INTERFACES`
    `static String` | `CRLF`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `StringUtil()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static void` | `append(StringBuilder buf, byte b, int base)` append hex digit
    `static void` | `append(StringBuilder buf, String s, int offset, int length)` Append substring to StringBuilder
    `static void` | `append2digits(StringBuffer buf, int i)`
    `static void` | `append2digits(StringBuilder buf, int i)`
    `static String` | `asciiToLowerCase(String s)` fast lower case conversion.
    `static boolean` | `endsWithIgnoreCase(String s, String w)`
    `static boolean` | `equals(String s, char[] buf, int offset, int length)`
    `static byte[]` | `getBytes(String s)`
    `static byte[]` | `getBytes(String s, String charset)`
    `static int` | `indexFrom(String s, String chars)` returns the next index of a character from the chars string
    `static boolean` | `isUTF8(String charset)`
    `static String` | `nonNull(String s)` Return a non null string.
    `static String` | `printable(byte[] b)`
    `static String` | `printable(String name)`
    `static String` | `replace(String s, String sub, String with)` replace substrings within string.
    `static String` | `sidBytesToString(byte[] sidBytes)` Converts a binary SID to a string SID http://en.wikipedia.org/wiki/Security_Identifier S-1-IdentifierAuthority-SubAuthority1-SubAuthority2-...-SubAuthorityn
    `static byte[]` | `sidStringToBytes(String sidString)` Converts a string SID to a binary SID http://en.wikipedia.org/wiki/Security_Identifier S-1-IdentifierAuthority-SubAuthority1-SubAuthority2-...-SubAuthorityn
    `static boolean` | `startsWithIgnoreCase(String s, String w)`
    `static String` | `toString(byte[] b, int offset, int length, String charset)`
    `static String` | `toUTF8String(byte[] b, int offset, int length)`
    `static String` | `unquote(String s)` Remove single or double quotes.

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### ALL_INTERFACES

          public static final String ALL_INTERFACES

      See Also:
        Constant Field Values

    - #### CRLF

          public static final String CRLF

      See Also:
        Constant Field Values

    - #### __LINE_SEPARATOR

          public static final String __LINE_SEPARATOR

    - #### __ISO_8859_1

          public static final String __ISO_8859_1

      See Also:
        Constant Field Values

    - #### __UTF8

          public static final String __UTF8

      See Also:
        Constant Field Values

    - #### __UTF8Alt

          public static final String __UTF8Alt

      See Also:
        Constant Field Values

    - #### __UTF16

          public static final String __UTF16

      See Also:
        Constant Field Values

    - #### __UTF8_CHARSET

          public static final Charset __UTF8_CHARSET

    - #### __ISO_8859_1_CHARSET

          public static final Charset __ISO_8859_1_CHARSET

  - ### Constructor Detail

    - #### StringUtil

          public StringUtil()

  - ### Method Detail

    - #### asciiToLowerCase

          public static String asciiToLowerCase(String s)

      fast lower case conversion. Only works on ascii (not unicode)
      Parameters:
        `s` - the string to convert
      Returns:
        a lower case version of s

    - #### startsWithIgnoreCase

          public static boolean startsWithIgnoreCase(String s,
                                     String w)

    - #### endsWithIgnoreCase

          public static boolean endsWithIgnoreCase(String s,
                                   String w)

    - #### indexFrom

          public static int indexFrom(String s,
                      String chars)

      returns the next index of a character from the chars string

    - #### replace

          public static String replace(String s,
                       String sub,
                       String with)

      replace substrings within string.

    - #### unquote

          public static String unquote(String s)

      Remove single or double quotes.

    - #### append

          public static void append(StringBuilder buf,
                    String s,
                    int offset,
                    int length)

      Append substring to StringBuilder
      Parameters:
        `buf` - StringBuilder to append to
        `s` - String to append from
        `offset` - The offset of the substring
        `length` - The length of the substring

    - #### append

          public static void append(StringBuilder buf,
                    byte b,
                    int base)

      append hex digit

    - #### append2digits

          public static void append2digits(StringBuffer buf,
                           int i)

    - #### append2digits

          public static void append2digits(StringBuilder buf,
                           int i)

    - #### nonNull

          public static String nonNull(String s)

      Return a non null string.
      Parameters:
        `s` - String
      Returns:
        The string passed in or empty string if it is null.

    - #### equals

          public static boolean equals(String s,
                       char[] buf,
                       int offset,
                       int length)

    - #### toUTF8String

          public static String toUTF8String(byte[] b,
                            int offset,
                            int length)

    - #### toString

          public static String toString(byte[] b,
                        int offset,
                        int length,
                        String charset)

    - #### isUTF8

          public static boolean isUTF8(String charset)

    - #### printable

          public static String printable(String name)

    - #### printable

          public static String printable(byte[] b)

    - #### getBytes

          public static byte[] getBytes(String s)

    - #### getBytes

          public static byte[] getBytes(String s,
                        String charset)

    - #### sidBytesToString

          public static String sidBytesToString(byte[] sidBytes)

      Converts a binary SID to a string SID http://en.wikipedia.org/wiki/Security_Identifier S-1-IdentifierAuthority-SubAuthority1-SubAuthority2-...-SubAuthorityn

    - #### sidStringToBytes

          public static byte[] sidStringToBytes(String sidString)

      Converts a string SID to a binary SID http://en.wikipedia.org/wiki/Security_Identifier S-1-IdentifierAuthority-SubAuthority1-SubAuthority2-...-SubAuthorityn

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