Class EmptyString

java.lang.Object
net.sf.saxon.regex.UnicodeString
net.sf.saxon.regex.EmptyString
All Implemented Interfaces:
CharSequence, Comparable<UnicodeString>, AtomicMatchKey
public final class EmptyString extends UnicodeString
An implementation of UnicodeString representing a zero-length string. This is a singleton class with only one instance.

  • Field Details

    • THE_INSTANCE

      public static final EmptyString THE_INSTANCE

  • Method Details

    • uSubstring

      public EmptyString uSubstring(int beginIndex, int endIndex)
      Description copied from class: UnicodeString
      Get a substring of this string
      Specified by:
      uSubstring in class UnicodeString
      Parameters:
      beginIndex - the index of the first character to be included (counting codepoints, not 16-bit characters)
      endIndex - the index of the first character to be NOT included (counting codepoints, not 16-bit characters)
      Returns:
      a substring

    • uCharAt

      public int uCharAt(int pos)
      Description copied from class: UnicodeString
      Get the character at a specified position
      Specified by:
      uCharAt in class UnicodeString
      Parameters:
      pos - the index of the required character (counting codepoints, not 16-bit characters)
      Returns:
      a character (Unicode codepoint) at the specified position.

    • uIndexOf

      public int uIndexOf(int search, int pos)
      Description copied from class: UnicodeString
      Get the first match for a given character
      Specified by:
      uIndexOf in class UnicodeString
      Parameters:
      search - the character to look for
      pos - the first position to look
      Returns:
      the position of the first occurrence of the sought character, or -1 if not found

    • uLength

      public int uLength()
      Description copied from class: UnicodeString
      Get the length of the string, in Unicode codepoints
      Specified by:
      uLength in class UnicodeString
      Returns:
      the number of codepoints in the string

    • isEnd

      public boolean isEnd(int pos)
      Description copied from class: UnicodeString
      Ask whether a given position is at (or beyond) the end of the string
      Specified by:
      isEnd in class UnicodeString
      Parameters:
      pos - the index of the required character (counting codepoints, not 16-bit characters)
      Returns:
      true iff if the specified index is after the end of the character stream

    • toString

      public String toString()
      Specified by:
      toString in interface CharSequence
      Overrides:
      toString in class Object

    • length

      public int length()

    • charAt

      public char charAt(int index)

    • subSequence

      public CharSequence subSequence(int start, int end)