FileDocCategorySizeDatePackage
ExtractReuters.javaAPI DocApache Lucene 2.2.05554Sat Jun 16 22:20:58 BST 2007org.apache.lucene.benchmark.utils

ExtractReuters

public class ExtractReuters extends Object
Split the Reuters SGML documents into Simple Text files containing: Title, Date, Dateline, Body

Fields Summary
private File
reutersDir
private File
outputDir
private static final String
LINE_SEPARATOR
Pattern
EXTRACTION_PATTERN
private static String[]
META_CHARS
private static String[]
META_CHARS_SERIALIZATIONS
Constructors Summary
public ExtractReuters(File reutersDir, File outputDir)


        
    
        this.reutersDir = reutersDir;
        this.outputDir = outputDir;
        System.out.println("Deleting all files in " + outputDir);
        File [] files = outputDir.listFiles();
        for (int i = 0; i < files.length; i++)
        {
            files[i].delete();
        }
Methods Summary
public voidextract()

        File [] sgmFiles = reutersDir.listFiles(new FileFilter()
        {
            public boolean accept(File file)
            {
                return file.getName().endsWith(".sgm");
            }
        });
        if (sgmFiles != null && sgmFiles.length > 0)
        {
            for (int i = 0; i < sgmFiles.length; i++)
            {
                File sgmFile = sgmFiles[i];
                extractFile(sgmFile);
            }
        }
        else
        {
            System.err.println("No .sgm files in " + reutersDir);
        }
protected voidextractFile(java.io.File sgmFile)
Override if you wish to change what is extracted

param
sgmFile


                    
       
    
        try
        {
            BufferedReader reader = new BufferedReader(new FileReader(sgmFile));

            StringBuffer buffer = new StringBuffer(1024);
            StringBuffer outBuffer = new StringBuffer(1024);

            String line = null;
            int index = -1;
            int docNumber = 0;
            while ((line = reader.readLine()) != null)
            {
                //when we see a closing reuters tag, flush the file

                if ((index = line.indexOf("</REUTERS")) == -1)
                {
                    //Replace the SGM escape sequences

                    buffer.append(line).append(' ");//accumulate the strings for now, then apply regular expression to get the pieces,
                }
                else
                {
                    //Extract the relevant pieces and write to a file in the output dir
                    Matcher matcher = EXTRACTION_PATTERN.matcher(buffer);
                    while (matcher.find())
                    {
                        for (int i = 1; i <= matcher.groupCount(); i++)
                        {
                            if (matcher.group(i) != null)
                            {
                                outBuffer.append(matcher.group(i));
                            }
                        }
                        outBuffer.append(LINE_SEPARATOR).append(LINE_SEPARATOR);
                    }
                    String out = outBuffer.toString();
                    for (int i = 0; i < META_CHARS_SERIALIZATIONS.length; i++)
                    {
                        out = out.replaceAll(META_CHARS_SERIALIZATIONS[i], META_CHARS[i]);
                    }
                    File outFile = new File(outputDir, sgmFile.getName() + "-" + (docNumber++) + ".txt");
                    //System.out.println("Writing " + outFile);
                    FileWriter writer = new FileWriter(outFile);
                    writer.write(out);
                    writer.close();
                    outBuffer.setLength(0);
                    buffer.setLength(0);
                }
            }
            reader.close();
        }

        catch (
                IOException e
                )

        {
            throw new RuntimeException(e);
        }
public static voidmain(java.lang.String[] args)

        if (args.length != 2)
        {
            printUsage();
        }
        File reutersDir = new File(args[0]);

        if (reutersDir.exists())
        {
            File outputDir = new File(args[1]);
            outputDir.mkdirs();
            ExtractReuters extractor = new ExtractReuters(reutersDir, outputDir);
            extractor.extract();
        }
        else
        {
            printUsage();
        }
private static voidprintUsage()

        System.err.println("Usage: java -cp <...> org.apache.lucene.benchmark.utils.ExtractReuters <Path to Reuters SGM files> <Output Path>");