masayoshi.okutsu@Eng 1997-01-13
TextBoundary doesn't work with some characters, such as HALFWIDTH KATANAKA
letters. To reproduce the problem, run the following test program with
HALFWIDTH KATANAKA letter.

import java.io.*;
import java.text.*;

public class BoundaryCheck {
  public static void main(String args[]) {
    BoundaryCheck nb = new BoundaryCheck();
    nb.run(args, System.out, System.err);
  }
  public BoundaryCheck() {
// nothing have to do
  }
  public void run(String args[], PrintStream out, PrintStream err) {
     if (args.length == 1) {
         String stringToExamine = args[0];
         //print each word in order
         TextBoundary boundary = TextBoundary.getLineBreak();
         boundary.setText(stringToExamine);
         printEachForward(boundary, out);
         //print each sentence in reverse order
         boundary = TextBoundary.getLineBreak();
         boundary.setText(stringToExamine);
         printEachbackward(boundary, out);
     }
  }
  public void printEachForward(TextBoundary boundary, PrintStream out) {
     int start = boundary.first();
     for (int end = boundary.next();
          end != TextBoundary.DONE;
          start = end, end = boundary.next()) {

         out.println("Fw:" + boundary.getText().substring(start, end));
     }
  }
  public void printEachbackward(TextBoundary boundary, PrintStream out) {
     int end = boundary.last();
     for (int start = boundary.previous();
          start != TextBoundary.DONE;
          end = start, start = boundary.previous()) {

         out.println("Bk:" + boundary.getText().substring(start, end));
     }
  }

}

Example of execution (includes EUCJIS halfwidth kana):

% java BoundaryCheck āĂăĄÄÁ
java.lang.ArrayIndexOutOfBoundsException: 19
        at java.text.UnicodeClassMapping.mappedChar(UnicodeClassMapping.java:87)
        at java.text.SimpleTextBoundary.mappedChar(SimpleTextBoundary.java:296)
        at java.text.SimpleTextBoundary.nextPosition(SimpleTextBoundary.java:278)
        at java.text.SimpleTextBoundary.next(SimpleTextBoundary.java:214)
        at BoundaryCheck.printEachForward(BoundaryCheck.java:27)
        at BoundaryCheck.run(BoundaryCheck.java:18)
        at BoundaryCheck.main(BoundaryCheck.java:7)