Package com.ibm.icu.impl
Interface TrieBuilder.DataManipulate
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- All Known Implementing Classes:
PropsVectors.DefaultGetFoldedValue
- Enclosing class:
- TrieBuilder
public static interface TrieBuilder.DataManipulate
Character data in com.ibm.impl.Trie have different user-specified format for different purposes. This interface specifies methods to be implemented in order for com.ibm.impl.Trie, to surrogate offset information encapsulated within the data.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description int
getFoldedValue(int start, int offset)
Build-time trie callback function, used with serialize().
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Method Detail
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getFoldedValue
int getFoldedValue(int start, int offset)
Build-time trie callback function, used with serialize(). This function calculates a lead surrogate's value including a folding offset from the 1024 supplementary code points [start..start+1024[ . It is U+10000 <= start <= U+10fc00 and (start&0x3ff)==0. The folding offset is provided by the caller. It is offset=UTRIE_BMP_INDEX_LENGTH+n*UTRIE_SURROGATE_BLOCK_COUNT with n=0..1023. Instead of the offset itself, n can be stored in 10 bits - or fewer if it can be assumed that few lead surrogates have associated data. The returned value must be - not zero if and only if there is relevant data for the corresponding 1024 supplementary code points - such that UTrie.getFoldingOffset(UNewTrieGetFoldedValue(..., offset))==offset- Returns:
- a folded value, or 0 if there is no relevant data for the lead surrogate.
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