question: public final void translate ( final CharSequence input , final Writer out ) throws IOException { if ( out == null ) { throw new IllegalArgumentException ( "The Writer must not be null" ) ; } if ( input == null ) { return ; } int pos = 0 ; final int len = input . length ( ) ; while ( pos < len ) { final int consumed = translate ( input , pos , out ) ; if ( consumed == 0 ) { char c1 = input . charAt ( pos ) ; out . write ( c1 ) ; pos ++ ; if ( Character . isHighSurrogate ( c1 ) && pos < len ) { char c2 = input . charAt ( pos ) ; if ( Character . isLowSurrogate ( c2 ) ) { out . write ( c2 ) ; pos ++ ; } } continue ; } for ( int pt = 0 ; pt < consumed ; pt ++ ) { pos += Character . charCount ( Character . codePointAt ( input , pos ) ) ; } } }
target:  Translate an input onto a Writer. This is intentionally final as its algorithm is  tightly coupled with the abstract method of this class. 