net.sf.saxon.regex

Class BMPString

java.lang.Object

net.sf.saxon.regex.UnicodeString

net.sf.saxon.regex.BMPString

All Implemented Interfaces:

CharSequence

public final class BMPString
extends UnicodeString

An implementation of UnicodeString optimized for strings that contain no characters outside the BMP (i.e. no characters whose codepoints exceed 65535)

Field Summary

Fields inherited from class net.sf.saxon.regex.UnicodeString

EMPTY_STRING

Constructor Summary

Constructors

Constructor and Description
BMPString(CharSequence src) Create a BMPString

Method Summary

Methods

Modifier and Type	Method and Description
char	charAt(int index) Returns the char value at the specified index.
CharSequence	getCharSequence() Get the underlying CharSequence
boolean	isEnd(int pos) Ask whether a given position is at (or beyond) the end of the string
int	length() Returns the length of this character sequence.
CharSequence	subSequence(int start, int end) Returns a new CharSequence that is a subsequence of this sequence.
String	toString()
int	uCharAt(int pos) Get the character at a specified position
int	uIndexOf(int search, int pos) Get the first match for a given character
int	uLength() Get the length of the string, in Unicode codepoints
UnicodeString	uSubstring(int beginIndex, int endIndex) Get a substring of this string

Methods inherited from class net.sf.saxon.regex.UnicodeString

containsSurrogatePairs, equals, getMaxWidth, hashCode, makeUnicodeString, makeUnicodeString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

BMPString

public BMPString(CharSequence src)

Create a BMPString

Parameters:

src - - encapsulated CharSequence. The client must ensure that this contains no surrogate pairs, and that it is immutable

Method Detail

uSubstring

public UnicodeString 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

getCharSequence

public CharSequence getCharSequence()

Get the underlying CharSequence

Returns:

the underlying CharSequence

length

public int length()

Returns the length of this character sequence. The length is the number of 16-bit chars in the sequence.

Returns:

the number of chars in this sequence

charAt

public char charAt(int index)

Returns the char value at the specified index. An index ranges from zero to length() - 1. The first char value of the sequence is at index zero, the next at index one, and so on, as for array indexing.

If the char value specified by the index is a surrogate, the surrogate value is returned.

Parameters:

index - the index of the char value to be returned

Returns:

the specified char value

Throws:

IndexOutOfBoundsException - if the index argument is negative or not less than length()

subSequence

public CharSequence subSequence(int start,
                       int end)

Returns a new CharSequence that is a subsequence of this sequence. The subsequence starts with the char value at the specified index and ends with the char value at index end - 1. The length (in chars) of the returned sequence is end - start, so if start == end then an empty sequence is returned.

Parameters:

start - the start index, inclusive

end - the end index, exclusive

Returns:

the specified subsequence

Throws:

IndexOutOfBoundsException - if start or end are negative, if end is greater than length(), or if start is greater than end