/*
*******************************************************************************
* Copyright (C) 2012, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*/
package com.ibm.icu.text;
import java.text.CharacterIterator;
import com.ibm.icu.impl.Assert;
import com.ibm.icu.util.BytesTrie;
import com.ibm.icu.util.BytesTrie.Result;
class BytesDictionaryMatcher extends DictionaryMatcher {
private final byte[] characters;
private final int transform;
public BytesDictionaryMatcher(byte[] chars, int transform) {
characters = chars;
Assert.assrt((transform & DictionaryData.TRANSFORM_TYPE_MASK) == DictionaryData.TRANSFORM_TYPE_OFFSET);
// while there is only one transform type so far, save the entire transform constant so that
// if we add any others, we need only change code in transform() and the assert above rather
// than adding a "transform type" variable
this.transform = transform;
}
private int transform(int c) {
if (c == 0x200D) {
return 0xFF;
} else if (c == 0x200C) {
return 0xFE;
}
int delta = c - (transform & DictionaryData.TRANSFORM_OFFSET_MASK);
if (delta < 0 || 0xFD < delta) {
return -1;
}
return delta;
}
public int matches(CharacterIterator text_, int maxLength, int[] lengths, int[] count_, int limit, int[] values) {
UCharacterIterator text = UCharacterIterator.getInstance(text_);
BytesTrie bt = new BytesTrie(characters, 0);
int c = text.nextCodePoint();
Result result = bt.first(transform(c));
// TODO: should numChars count Character.charCount() ?
int numChars = 1;
int count = 0;
for (;;) {
if (result.hasValue()) {
if (count < limit) {
if (values != null) {
values[count] = bt.getValue();
}
lengths[count] = numChars;
count++;
}
if (result == Result.FINAL_VALUE) {
break;
}
} else if (result == Result.NO_MATCH) {
break;
}
if (numChars >= maxLength) {
break;
}
c = text.nextCodePoint();
++numChars;
result = bt.next(transform(c));
}
count_[0] = count;
return numChars;
}
public int getType() {
return DictionaryData.TRIE_TYPE_BYTES;
}
}