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package com.sun.star.help;

import java.io.File;
import java.io.Reader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
//import java.io.FileReader;
import java.io.StringReader;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;

/** Lucene Document for help files */
public class HelpFileDocument
{
    /** Creates reader for UTF-8 files
    */
    private static Reader getReaderForFile( File aFile )
        throws java.io.FileNotFoundException, java.io.UnsupportedEncodingException {
		Reader aReader;
		if( aFile != null ) {
			FileInputStream fis = new FileInputStream( aFile );
			aReader = new InputStreamReader( fis, "UTF-8" );
		}
		else {
			aReader = new StringReader( "" );
		}
		return aReader;
    }
    
    /** Makes a document for a File.
    */
    public static Document Document( String aModule, File aCaptionFile, File aContentFile )
        throws java.io.FileNotFoundException, java.io.UnsupportedEncodingException {
		Document doc = new Document();

		// Add the path of the file as a field named "path".  Use a field that is 
		// indexed (i.e. searchable), but don't tokenize the field into words.
		File aFile = aCaptionFile != null ? aCaptionFile : aContentFile;
		if( aFile != null )
		{
			String aPath = "#HLP#" + aModule + "/" + aFile.getName();
			doc.add(new Field("path", aPath, Field.Store.YES, Field.Index.UN_TOKENIZED));
		}
		
		// Add the caption of the file to a field named "caption".  Specify a Reader,
		// so that the text of the file is tokenized and indexed, but not stored.
		doc.add( new Field( "caption", getReaderForFile( aCaptionFile ) ) );

		// Add the contents of the file to a field named "content".  Specify a Reader,
		// so that the text of the file is tokenized and indexed, but not stored.
		doc.add( new Field( "content", getReaderForFile( aContentFile ) ) );
		
		// return the document
		return doc;
	}

    private HelpFileDocument() {}
}