Re: CSV Parsing algorithms in Java

in message <8HtvetBvMhTFFwg1@nowhere.nnn>, Jeffrey Spoon
('JeffreySpoon@hotmail.com') wrote:


Then write your own; it's a trivial thing to do. Here, in fact, is one I
wrote earlier:

/**
 * MIDP does not provide a StringTokenizer. Because this has to be
 * compatible with MIDP we'll provide our own. If you have access to a real
 * StringTokenizer don't use this one - it is minimal and possibly
 * inefficient.
 */
public class StringTokenizer
{
        //~ Instance fields -----------------------------------------------

        /** the source string, which I tokenize */
        private String source = null;

        /** the separator character which I split it on */
        private char sep = ' ';

        /** my current cursor into the strong */
        private int cursor = 0;

        //~ Constructors --------------------------------------------------

        /**
         * @param sep the separator which separates tokens in this source
         * @param source the source string to separate into tokens
         */
        public StringTokenizer( String source, char sep )
        {
                super( );
                this.sep = sep;
                this.source = source;
        }

        //~ Methods -------------------------------------------------------

        /**
         * @return true if this tokenizer still has more tokens, else false
         */
        public boolean hasMoreTokens( )
        {
                return ( ( source != null ) && ( cursor < source.length( ) ) );
        }

        /**
         * Test harness only - do not use
         *
         * @param args
         */
        public static void main( String[] args )
        {
                if ( args.length == 2 )
                {
                        StringTokenizer tock =
                                new StringTokenizer( args[0], args[1].charAt( 0 ) );

                        System.out.println( "String is: '" + args[0] + "'" );
                        System.out.println( "Separator is: '" + args[1].charAt( 0 ) + "'" );

                        for ( int i = 0; tock.hasMoreTokens( ); i++ )
                        {
                                System.out.println( Integer.toString( i ) + ": '" +
                                        tock.nextToken( ) + "'" );
                        }
                }
        }

        /**
         * @return the next token from this string tokenizer, or null if there are
         * no more.
         */
        public synchronized String nextToken( )
        {
                String result = null;
                int end = source.indexOf( sep, cursor );

                if ( cursor < source.length( ) )
                {
                        if ( end > -1 )
                        {
                                result = source.substring( cursor, end );
                                cursor = end + 1;
                        }
                        else
                        {
                                result = source.substring( cursor );
                                cursor = source.length( );
                        }
                }

                return result;
        }
}

--
simon@jasmine.org.uk (Simon Brooke) http://www.jasmine.org.uk/~simon/
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