133         return DONE;
 134     }
 135 
 136 
 137     /**
 138      * Returns previous UTF16 character and decrements the iterator's currentIndex by
 139      * 1.
 140      * If the resulting currentIndex is less than 0, the currentIndex is reset to 0 and a
 141      * value of DONECODEPOINT is returned.
 142      * @return next UTF16 character in text or DONE if the new currentIndex is off the
 143      *         start of the text range.
 144      */
 145     public int previous(){
 146         if (currentIndex > 0) {
 147             return replaceable.charAt(--currentIndex);
 148         }
 149         return DONE;
 150     }
 151 
 152     /**
 153      * <p>Sets the currentIndex to the specified currentIndex in the text and returns that
 154      * single UTF16 character at currentIndex.
 155      * This assumes the text is stored as 16-bit code units.</p>
 156      * @param currentIndex the currentIndex within the text.
 157      * @exception IllegalArgumentException is thrown if an invalid currentIndex is
 158      *            supplied. i.e. currentIndex is out of bounds.
 159      * @return the character at the specified currentIndex or DONE if the specified
 160      *         currentIndex is equal to the end of the text.
 161      */
 162     public void setIndex(int currentIndex) {
 163         if (currentIndex < 0 || currentIndex > replaceable.length()) {
 164             throw new IllegalArgumentException();
 165         }
 166         this.currentIndex = currentIndex;
 167     }
 168 
 169     //// for StringPrep
 170     public int getText(char[] fillIn, int offset){
 171         int length = replaceable.length();
 172         if(offset < 0 || offset + length > fillIn.length){
 173             throw new IndexOutOfBoundsException(Integer.toString(length));
 174         }
 175         replaceable.getChars(0,length,fillIn,offset);
 176         return length;
 177     }
 178 
 179     // private data members ----------------------------------------------------
 180 

 133         return DONE;
 134     }
 135 
 136 
 137     /**
 138      * Returns previous UTF16 character and decrements the iterator's currentIndex by
 139      * 1.
 140      * If the resulting currentIndex is less than 0, the currentIndex is reset to 0 and a
 141      * value of DONECODEPOINT is returned.
 142      * @return next UTF16 character in text or DONE if the new currentIndex is off the
 143      *         start of the text range.
 144      */
 145     public int previous(){
 146         if (currentIndex > 0) {
 147             return replaceable.charAt(--currentIndex);
 148         }
 149         return DONE;
 150     }
 151 
 152     /**
 153      * Sets the currentIndex to the specified currentIndex in the text and returns that
 154      * single UTF16 character at currentIndex.
 155      * This assumes the text is stored as 16-bit code units.
 156      * @param currentIndex the currentIndex within the text.
 157      * @exception IllegalArgumentException is thrown if an invalid currentIndex is
 158      *            supplied. i.e. currentIndex is out of bounds.


 159      */
 160     public void setIndex(int currentIndex) {
 161         if (currentIndex < 0 || currentIndex > replaceable.length()) {
 162             throw new IllegalArgumentException();
 163         }
 164         this.currentIndex = currentIndex;
 165     }
 166 
 167     //// for StringPrep
 168     public int getText(char[] fillIn, int offset){
 169         int length = replaceable.length();
 170         if(offset < 0 || offset + length > fillIn.length){
 171             throw new IndexOutOfBoundsException(Integer.toString(length));
 172         }
 173         replaceable.getChars(0,length,fillIn,offset);
 174         return length;
 175     }
 176 
 177     // private data members ----------------------------------------------------
 178