57 lines
1.7 KiB
Java
57 lines
1.7 KiB
Java
package org.thdl.lucene;
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import org.apache.lucene.analysis.*;
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import org.apache.lucene.analysis.Token;
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import java.io.*;
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import java.net.*;
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import java.util.*;
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/**
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* Trims excess tshegs and other punctuation from Tibetan
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* words, leaving them in their proper citation form.
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*
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* @author Edward Garrett
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*/
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public class EdgeTshegTrimmer extends TokenFilter {
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public EdgeTshegTrimmer(TokenStream input) {
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super(input);
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}
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/**
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* @return next token in TokenStream, stripped of superfluous
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* tshegs
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*/
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public Token next() throws IOException {
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while (true) {
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Token token = input.next();
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if (token == null)
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return null;
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int length=token.termText().length();
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int start=0;
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while (start<length && !TshegBarTokenizer.isPartOfTshegBar(token.termText().charAt(start))) start++;
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int end=length-1;
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while (end>-1 && !TshegBarTokenizer.isPartOfTshegBar(token.termText().charAt(end))) end--;
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if (start<=end) {
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return new Token(addFinalTshegIfNecessary(token.termText().substring(start,end+1)), token.startOffset(), token.endOffset());
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}
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}
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}
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/**
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* Adds a tsheg to a <code>String</code> that doesn't
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* already end in one.
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*
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* @return original <code>String</code> with final tsheg
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* added if necessary
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*/
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public static String addFinalTshegIfNecessary(String s) {
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if (s.charAt(s.length()-1) == '\u0F0B')
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return s;
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else
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return s += "\u0F0B";
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// if (last == '\u0F42' || last == '\u0F0B')
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// return s;
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// else
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}
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}
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