Package com.ibm.icu.impl

Class BMPSet

java.lang.Object

com.ibm.icu.impl.BMPSet

public final class BMPSet
extends Object

Helper class for frozen UnicodeSets, implements contains() and span() optimized for BMP code points. Latin-1: Look up bytes. 2-byte characters: Bits organized vertically. 3-byte characters: Use zero/one/mixed data per 64-block in U+0000..U+FFFF, with mixed for illegal ranges. Supplementary characters: Call contains() on the parent set.

Field Summary

Fields

Modifier and Type	Field	Description
static int	U16_SURROGATE_OFFSET

Constructor Summary

Constructors

Constructor	Description
BMPSet(int[] parentList, int parentListLength)
BMPSet(BMPSet otherBMPSet, int[] newParentList, int newParentListLength)

Method Summary

Modifier and Type	Method	Description
boolean	contains(int c)
int	span(CharSequence s, int start, UnicodeSet.SpanCondition spanCondition, OutputInt outCount)	Span the initial substring for which each character c has spanCondition==contains(c).
int	spanBack(CharSequence s, int limit, UnicodeSet.SpanCondition spanCondition)	Symmetrical with span().

Methods inherited from class java.lang.Object

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

Field Detail

U16_SURROGATE_OFFSET

public static int U16_SURROGATE_OFFSET

Constructor Detail

BMPSet

public BMPSet(int[] parentList,
              int parentListLength)

BMPSet

public BMPSet(BMPSet otherBMPSet,
              int[] newParentList,
              int newParentListLength)

Method Detail

contains

public boolean contains(int c)

span

public final int span(CharSequence s,
                      int start,
                      UnicodeSet.SpanCondition spanCondition,
                      OutputInt outCount)

Span the initial substring for which each character c has spanCondition==contains(c). It must be spanCondition==0 or 1.

Parameters:

start - The start index

outCount - If not null: Receives the number of code points in the span.

Returns:

the limit (exclusive end) of the span NOTE: to reduce the overhead of function call to contains(c), it is manually inlined here. Check for sufficient length for trail unit for each surrogate pair. Handle single surrogates as surrogate code points as usual in ICU.

spanBack

public final int spanBack(CharSequence s,
                          int limit,
                          UnicodeSet.SpanCondition spanCondition)

Symmetrical with span(). Span the trailing substring for which each character c has spanCondition==contains(c). It must be s.length >= limit and spanCondition==0 or 1.

Returns:

The string index which starts the span (i.e. inclusive).