65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
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/**
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* The Builder class for DictionaryBasedBreakIterator inherits almost all of
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* its functionality from the Builder class for RuleBasedBreakIterator, but
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* extends it with extra logic to handle the "<dictionary>" token
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*/
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protected class Builder extends RuleBasedBreakIterator.Builder {
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/**
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* A CharSet that contains all the characters represented in the dictionary
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*/
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private CharSet dictionaryChars = new CharSet();
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private String dictionaryExpression = "";
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/**
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* No special initialization
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*/
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public Builder() {
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}
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/**
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* We override handleSpecialSubstitution() to add logic to handle
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* the <dictionary> tag. If we see a substitution named "<dictionary>",
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* parse the substitution expression and store the result in
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* dictionaryChars.
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*/
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protected void handleSpecialSubstitution(String replace, String replaceWith,
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int startPos, String description) {
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super.handleSpecialSubstitution(replace, replaceWith, startPos, description);
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if (replace.equals("<dictionary>")) {
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if (replaceWith.charAt(0) == '(') {
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error("Dictionary group can't be enclosed in (", startPos, description);
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}
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dictionaryExpression = replaceWith;
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dictionaryChars = CharSet.parseString(replaceWith);
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}
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}
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/**
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* The other half of the logic to handle the dictionary characters happens here.
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* After the inherited builder has derived the real character categories, we
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* set up the categoryFlags array in the iterator. This array contains "true"
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* for every character category that includes a dictionary character.
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*/
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protected void buildCharCategories(Vector tempRuleList) {
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super.buildCharCategories(tempRuleList);
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categoryFlags = new boolean[categories.size()];
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for (int i = 0; i < categories.size(); i++) {
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CharSet cs = (CharSet)categories.elementAt(i);
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if (!(cs.intersection(dictionaryChars).empty())) {
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categoryFlags[i] = true;
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}
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}
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}
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// This function is actually called by RuleBasedBreakIterator.buildCharCategories(),
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// which is called by the function above. This gives us a way to create a separate
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// character category for the dictionary characters even when RuleBasedBreakIterator
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// isn't making a distinction
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protected void mungeExpressionList(Hashtable expressions) {
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expressions.put(dictionaryExpression, dictionaryChars);
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}
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}
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