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From Jarlath Lyons <jar.ly...@activeindexing.com>
Subject Stylesheet fix (more legible?)
Date Fri, 14 Apr 2000 19:21:46 GMT

The attached class should be of some use ....

I happen to be starting with a stream, so I use it like below ....

It's a rather simple api ... you create a Hashtable of lines you want to add by
setting the Hashtable key to the destination line number.

To make it really flexible, you'd probably need to use a Vector instead of a
Hashtable in order to insert multiple lines at 'line 1' .... but I want higher performance
...
I don't want to be constantly scanning through all the Vector elements. ..../



----------

Hashtable styleSheetInfo = new Hashtable();

String styleSheet = ResourceBundle.....getString("stylesheet.vanilla");
...OR ...
String styleSheet = "<?xml-stylesheet href=\"http://a.b.c/std/xsl/vanilla.xsl\" type=\"text/xsl\"?>\n<?cocoon-process
type=\"xslt\"?>";

//
// we want to add the stylesheet tags right after the first line ...
//
styleSheetInfo.put(new Integer(1),styleSheet);

FilterLineNumberReader flnr = new FilterLineNumberReader(new InputStreamReader(... input stream
....),styleSheetInfo);


... read away .....


------------------------



import java.io.Reader;
import java.io.LineNumberReader;
import java.io.IOException;
import java.util.Hashtable;

public class FilterLineNumberReader extends LineNumberReader
{
        private Hashtable insertLines = null;
        String line = null;
        Integer lineNum = null;

        public FilterLineNumberReader(Reader in, Hashtable insertLines)
        {
                super(in);
                this.insertLines = insertLines;
        }

        public int read(char[] cbuf, int off, int len)
                throws IOException
        {
                if (len < 1)
                        return -1;

                lineNum = new Integer(getLineNumber());

                //
                // should we insert from the hashtable or read from the stream?
                //
                if (null != insertLines && null != insertLines.get(lineNum))
                {
                        line = (String) insertLines.get(lineNum);

                        //
                        // now make sure we remove this line from the list ...
                        //
                        insertLines.remove(lineNum);
                }
                else
                        line = readLine();

                if (null != line)
                {
                        if (len < line.length())
                        {
                                System.out.println("FilterLineNumberReader.read(): big problem
... couldn't finish
writing from the stream ...");
                                return -1;
                        }

                        for (int i = 0; i < line.length(); i++)
                        {
                                cbuf[off + i] = line.charAt(i);
                        }
                        cbuf[off + line.length()] = '\n';
                        return line.length() + 1;
                }
                return -1;
        }
}




--
Jar Lyons
Senior Software Engineer
ActiveIndexing.com

jar.lyons@activeindexing.com
(206) 387-5117

100 West Harrison, Suite 310
Seattle, WA  98119




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