Re: how to: int[] toInts(char[] chars)

Thomas Fritsch wrote:


[snip]


Thank you Thomas. I'll post what I have.
I will appreciate any comments.

import java.util.ArrayList;
import java.util.List;

public class Scratch {

   /**
    * Given an array of UTF16 encoded char,
    * return an equivalent array of int codepoints.
    *
    * @param chars UTF16 encoded char[]
    * @return int[] codepoints
    * @throws Error on invalid UTF16 input
    */
   int[] toInts(char[] chars) throws Error {

     int[] ret = null;

     if ((chars.length > 0)) {

       List<Integer> buf
       = new ArrayList<Integer>();
       int idx = 0;

       while (idx < chars.length) {
         int codePoint
         = Character.codePointAt(chars, idx, chars.length);
         if ( codePoint < 0xD800 || codePoint > 0xDFFF )
         {
           buf.add(Integer.valueOf(codePoint));
           idx += Character.charCount(codePoint);
         }
         else {
           throw new Error
           ("index: " + (idx + 1));
         }
       }

       ret = new int[buf.size()];
       for (int i = 0; i < buf.size(); ++i) {
         ret[i] = buf.get(i).intValue();
       }
     }
     return ret == null ? null : ret;
   }

   public static void main(String[] args) {

     char[] fourdish
     = Character.toChars(Integer.parseInt("12409", 16));

     char[][] test =
     {
         { 'S', fourdish[0], fourdish[1] },
         { 'S', '\uDEEE' }
     };

     Scratch scr = new Scratch();
     int count = 1;

     try {
       for (char[] ca : test) {
         int[] temp = scr.toInts(ca);
         for (int i : temp) {
           System.out.print(i + " ");
         }
         System.out.println();
         ++count;
       }
     } catch (Error e) {
       System.err.println
       ("Error test: " + count + ", " + e.getMessage());
     }

   }

}