public abstract class UnicodeFilter extends Object implements UnicodeMatcher
UnicodeFilterdefines a protocol for selecting a subset of the full range (U+0000 to U+FFFF) of Unicode characters. Currently, filters are used in conjunction with classes like
Transliteratorto only process selected characters through a transformation.
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This API is ICU internal only.
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Returns true for characters that are in the selected subset.
Default implementation of UnicodeMatcher::matches() for Unicode filters.
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
@Deprecated protected UnicodeFilter()
public abstract boolean contains(int c)
public int matches(Replaceable text, int offset, int limit, boolean incremental)
text- the text to be matched
offset- on input, the index into text at which to begin matching. On output, the limit of the matched text. The number of matched characters is the output value of offset minus the input value. Offset should always point to the HIGH SURROGATE (leading code unit) of a pair of surrogates, both on entry and upon return.
limit- the limit index of text to be matched. Greater than offset for a forward direction match, less than offset for a backward direction match. The last character to be considered for matching will be text.charAt(limit-1) in the forward direction or text.charAt(limit+1) in the backward direction.
incremental- if true, then assume further characters may be inserted at limit and check for partial matching. Otherwise assume the text as given is complete.
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