package dbxml.xtint;

import java.io.*;

import org.xml.sax.*;

import com.jclark.xsl.sax.*;

import dbxml.sax.*;

/**
 * Integration of JDBCSAXParser with XT.
 * 
 * This class is based on com.jclark.xsl.sax.Driver.
 */
public class JDBCXSLProcessor {
    private static XSLProcessor _xslProcessor;

    public static void main(String[] argv) {
        if (argv.length != 3) {
            System.out.println("Usage: JDBCXSLProcessor dbPropFile xslFile "
                               + "outFile");
            System.exit(-1);
        }

        String dbPropFile = argv[0];
        String xslFile = argv[1];
        String outFile = argv[2];
        String xmlParserClassName = "dbxml.sax.JDBCSAXParser";
        String xslParserClassName = "com.jclark.xml.sax.CommentDriver";

        _xslProcessor 
            = createXSLProcessor(xmlParserClassName, xslParserClassName);

        OutputMethodHandlerImpl outputMethodHandler 
            = new OutputMethodHandlerImpl(_xslProcessor);
        
        _xslProcessor.setOutputMethodHandler(outputMethodHandler);
        outputMethodHandler.setDestination(new FileDestination(outFile));

        try {
            InputSource dbis 
                = JDBCSAXUtil.setupSourceFromProperties(dbPropFile);
            transform(_xslProcessor, 
                      Driver.fileInputSource(new File(xslFile)), dbis);
        } catch (IOException ex1) {
            System.out.println(ex1);
        } catch (ClassNotFoundException ex3) {
            System.out.println(ex3);
        }
    }

    static private XSLProcessor createXSLProcessor(String xmlParserClassName,
                                                   String xslParserClassName) {
        XSLProcessor xslProcessor = null;
        try {
            Parser xmlParser 
                = (Parser)Class.forName(xmlParserClassName).newInstance();
            Parser xslParser 
                = (Parser)Class.forName(xslParserClassName).newInstance();
            
            if ((xmlParser == null) || (xslParser == null)) {
                return null;
            }
            
            xslProcessor = new XSLProcessorImpl();
            xslProcessor.setParser(xmlParser, xslParser);       
        } catch (ClassNotFoundException ex1) {
            System.out.println(ex1);
        } catch (InstantiationException ex2) {
            System.out.println(ex2);
        } catch (IllegalAccessException ex3) {
            System.out.println(ex3);
        }
        return xslProcessor;
    }

    //=====================================================================
    // Following method copied from com.jclark.xsl.sax.Driver becuase they
    // have package access there.
    static boolean transform(XSLProcessor xsl,
                             InputSource stylesheetSource,
                             InputSource inputSource) {
        try {
            xsl.loadStylesheet(stylesheetSource);
            xsl.parse(inputSource);
            return true;
        }
        catch (SAXParseException e) {
            printSAXParseException(e);
        }
        catch (SAXException e) {
            System.err.println(e.getMessage());
        }
        catch (IOException e) {
            System.err.println(e.toString());
        }
        return false;
    }
    
    static void printSAXParseException(SAXParseException e) {
        String systemId = e.getSystemId();
        int lineNumber = e.getLineNumber();
        if (systemId != null)
            System.err.print(systemId + ":");
        if (lineNumber >= 0)
            System.err.print(lineNumber + ":");
        if (systemId != null || lineNumber >= 0)
            System.err.print(" ");
        System.err.println(e.getMessage());
    }

}