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/* GENERATED SOURCE. DO NOT MODIFY. */
/*
*******************************************************************************
* Copyright (C) 1996-2016, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*/
package android.icu.text;
/**
* <code>UnicodeFilter</code> defines 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
* {@link android.icu.text.Transliterator}
* to only process selected characters through a
* transformation.
*/
public abstract class UnicodeFilter implements UnicodeMatcher {
/**
* Returns <tt>true</tt> for characters that are in the selected
* subset. In other words, if a character is <b>to be
* filtered</b>, then <tt>contains()</tt> returns
* <b><tt>false</tt></b>.
*/
public abstract boolean contains(int c);
/**
* Default implementation of UnicodeMatcher::matches() for Unicode
* filters. Matches a single 16-bit code unit at offset.
*/
public int matches(Replaceable text,
int[] offset,
int limit,
boolean incremental) {
int c;
if (offset[0] < limit &&
contains(c = text.char32At(offset[0]))) {
offset[0] += UTF16.getCharCount(c);
return U_MATCH;
}
if (offset[0] > limit && contains(text.char32At(offset[0]))) {
// Backup offset by 1, unless the preceding character is a
// surrogate pair -- then backup by 2 (keep offset pointing at
// the lead surrogate).
--offset[0];
if (offset[0] >= 0) {
offset[0] -= UTF16.getCharCount(text.char32At(offset[0])) - 1;
}
return U_MATCH;
}
if (incremental && offset[0] == limit) {
return U_PARTIAL_MATCH;
}
return U_MISMATCH;
}
// TODO Remove this when the JDK property implements MemberDoc.isSynthetic
/**
* (This should not be here; it is declared to make CheckTags
* happy. Java inserts a synthetic constructor and CheckTags
* can't tell that it's synthetic.)
*
* @deprecated This API is ICU internal only.
* @hide original deprecated declaration
* @hide draft / provisional / internal are hidden on Android
*/
@Deprecated
protected UnicodeFilter() {}
}
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