add Excel-to-HTML converter (with test suite)

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1142780 13f79535-47bb-0310-9956-ffa450edef68

src/scratchpad/src/org/apache/poi/hssf/usermodel/converter/ExcelToHtmlConverter.java

@@ -0,0 +1,473 @@
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+package org.apache.poi.hssf.usermodel.converter;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+
+import org.apache.poi.hssf.usermodel.HSSFCell;
+import org.apache.poi.hssf.usermodel.HSSFCellStyle;
+import org.apache.poi.hssf.usermodel.HSSFDataFormatter;
+import org.apache.poi.hssf.usermodel.HSSFFont;
+import org.apache.poi.hssf.usermodel.HSSFRichTextString;
+import org.apache.poi.hssf.usermodel.HSSFRow;
+import org.apache.poi.hssf.usermodel.HSSFSheet;
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.hssf.util.HSSFColor;
+import org.apache.poi.hwpf.converter.HtmlDocumentFacade;
+import org.apache.poi.ss.formula.eval.ErrorEval;
+import org.apache.poi.util.POILogFactory;
+import org.apache.poi.util.POILogger;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Text;
+
+/**
+ * Converts xls files (97-2007) to HTML file.
+ * 
+ * @author Sergey Vladimirov (vlsergey {at} gmail {dot} com)
+ */
+public class ExcelToHtmlConverter
+{
+
+    private static final POILogger logger = POILogFactory
+            .getLogger( ExcelToHtmlConverter.class );
+
+    /**
+     * Java main() interface to interact with {@link ExcelToHtmlConverter}
+     * 
+     * <p>
+     * Usage: ExcelToHtmlConverter infile outfile
+     * </p>
+     * Where infile is an input .xls file ( Word 97-2007) which will be rendered
+     * as HTML into outfile
+     */
+    public static void main( String[] args )
+    {
+        if ( args.length < 2 )
+        {
+            System.err
+                    .println( "Usage: ExcelToHtmlConverter <inputFile.doc> <saveTo.html>" );
+            return;
+        }
+
+        System.out.println( "Converting " + args[0] );
+        System.out.println( "Saving output to " + args[1] );
+        try
+        {
+            Document doc = ExcelToHtmlConverter.process( new File( args[0] ) );
+
+            FileWriter out = new FileWriter( args[1] );
+            DOMSource domSource = new DOMSource( doc );
+            StreamResult streamResult = new StreamResult( out );
+
+            TransformerFactory tf = TransformerFactory.newInstance();
+            Transformer serializer = tf.newTransformer();
+            // TODO set encoding from a command argument
+            serializer.setOutputProperty( OutputKeys.ENCODING, "UTF-8" );
+            serializer.setOutputProperty( OutputKeys.INDENT, "yes" );
+            serializer.setOutputProperty( OutputKeys.METHOD, "html" );
+            serializer.transform( domSource, streamResult );
+            out.close();
+        }
+        catch ( Exception e )
+        {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Converts Excel file (97-2007) into HTML file.
+     * 
+     * @param xlsFile
+     *            file to process
+     * @return DOM representation of result HTML
+     */
+    public static Document process( File xlsFile ) throws Exception
+    {
+        final HSSFWorkbook workbook = ExcelToHtmlUtils.loadXls( xlsFile );
+        ExcelToHtmlConverter excelToHtmlConverter = new ExcelToHtmlConverter(
+                DocumentBuilderFactory.newInstance().newDocumentBuilder()
+                        .newDocument() );
+        excelToHtmlConverter.processWorkbook( workbook );
+        return excelToHtmlConverter.getDocument();
+    }
+
+    private final HSSFDataFormatter _formatter = new HSSFDataFormatter();
+
+    private final HtmlDocumentFacade htmlDocumentFacade;
+
+    private final Element styles;
+
+    private final Set<Short> usedStyles = new LinkedHashSet<Short>();
+
+    public ExcelToHtmlConverter( Document doc )
+    {
+        htmlDocumentFacade = new HtmlDocumentFacade( doc );
+
+        styles = doc.createElement( "style" );
+        styles.setAttribute( "type", "text/css" );
+        htmlDocumentFacade.getHead().appendChild( styles );
+    }
+
+    private String buildStyle( HSSFWorkbook workbook, HSSFCellStyle cellStyle )
+    {
+        StringBuilder style = new StringBuilder();
+
+        style.append( "white-space: pre-wrap; " );
+
+        switch ( cellStyle.getAlignment() )
+        {
+        case HSSFCellStyle.ALIGN_CENTER:
+            style.append( "text-align: center; " );
+            break;
+        case HSSFCellStyle.ALIGN_CENTER_SELECTION:
+            style.append( "text-align: center; " );
+            break;
+        case HSSFCellStyle.ALIGN_FILL:
+            // XXX: shall we support fill?
+            break;
+        case HSSFCellStyle.ALIGN_GENERAL:
+            break;
+        case HSSFCellStyle.ALIGN_JUSTIFY:
+            style.append( "text-align: justify; " );
+            break;
+        case HSSFCellStyle.ALIGN_LEFT:
+            style.append( "text-align: left; " );
+            break;
+        case HSSFCellStyle.ALIGN_RIGHT:
+            style.append( "text-align: right; " );
+            break;
+        }
+
+        if ( cellStyle.getFillPattern() == 0 )
+        {
+            // no fill
+        }
+        else if ( cellStyle.getFillPattern() == 1 )
+        {
+            final HSSFColor foregroundColor = cellStyle
+                    .getFillForegroundColorColor();
+            if ( foregroundColor != null )
+                style.append( "background-color: "
+                        + ExcelToHtmlUtils.getColor( foregroundColor ) + "; " );
+        }
+        else
+        {
+            final HSSFColor backgroundColor = cellStyle
+                    .getFillBackgroundColorColor();
+            if ( backgroundColor != null )
+                style.append( "background-color: "
+                        + ExcelToHtmlUtils.getColor( backgroundColor ) + "; " );
+        }
+
+        buildStyle_border( workbook, style, "top", cellStyle.getBorderTop(),
+                cellStyle.getTopBorderColor() );
+        buildStyle_border( workbook, style, "right",
+                cellStyle.getBorderRight(), cellStyle.getRightBorderColor() );
+        buildStyle_border( workbook, style, "bottom",
+                cellStyle.getBorderBottom(), cellStyle.getBottomBorderColor() );
+        buildStyle_border( workbook, style, "left", cellStyle.getBorderLeft(),
+                cellStyle.getLeftBorderColor() );
+
+        HSSFFont font = cellStyle.getFont( workbook );
+        buildStyle_font( workbook, style, font );
+
+        return style.toString();
+    }
+
+    private void buildStyle_border( HSSFWorkbook workbook, StringBuilder style,
+            String type, short xlsBorder, short borderColor )
+    {
+        style.append( type + "-border-style: "
+                + ExcelToHtmlUtils.getBorderStyle( xlsBorder ) + "; " );
+
+        if ( xlsBorder == HSSFCellStyle.BORDER_NONE )
+            return;
+
+        style.append( type + "-border-width: "
+                + ExcelToHtmlUtils.getBorderWidth( xlsBorder ) + "; " );
+
+        final HSSFColor color = workbook.getCustomPalette().getColor(
+                borderColor );
+        if ( color != null )
+            style.append( type + "-border-color: "
+                    + ExcelToHtmlUtils.getColor( color ) + "; " );
+    }
+
+    void buildStyle_font( HSSFWorkbook workbook, StringBuilder style,
+            HSSFFont font )
+    {
+        switch ( font.getBoldweight() )
+        {
+        case HSSFFont.BOLDWEIGHT_BOLD:
+            style.append( "font-weight: bold; " );
+            break;
+        case HSSFFont.BOLDWEIGHT_NORMAL:
+            style.append( "font-weight: normal; " );
+            break;
+        }
+
+        final HSSFColor fontColor = workbook.getCustomPalette().getColor(
+                font.getColor() );
+        if ( fontColor != null )
+            style.append( "color: " + ExcelToHtmlUtils.getColor( fontColor )
+                    + "; " );
+
+        if ( font.getFontHeightInPoints() != 0 )
+            style.append( "font-size: " + font.getFontHeightInPoints() + "pt; " );
+
+        if ( font.getItalic() )
+        {
+            style.append( "font-style: italic; " );
+        }
+    }
+
+    public Document getDocument()
+    {
+        return htmlDocumentFacade.getDocument();
+    }
+
+    protected boolean processCell( HSSFCell cell, Element tableCellElement )
+    {
+        final HSSFCellStyle cellStyle = cell.getCellStyle();
+
+        String value;
+        switch ( cell.getCellType() )
+        {
+        case HSSFCell.CELL_TYPE_STRING:
+            // XXX: enrich
+            value = cell.getRichStringCellValue().getString();
+            break;
+        case HSSFCell.CELL_TYPE_FORMULA:
+            switch ( cell.getCachedFormulaResultType() )
+            {
+            case HSSFCell.CELL_TYPE_STRING:
+                HSSFRichTextString str = cell.getRichStringCellValue();
+                if ( str != null && str.length() > 0 )
+                {
+                    value = ( str.toString() );
+                }
+                else
+                {
+                    value = ExcelToHtmlUtils.EMPTY;
+                }
+                break;
+            case HSSFCell.CELL_TYPE_NUMERIC:
+                HSSFCellStyle style = cellStyle;
+                if ( style == null )
+                {
+                    value = String.valueOf( cell.getNumericCellValue() );
+                }
+                else
+                {
+                    value = ( _formatter.formatRawCellContents(
+                            cell.getNumericCellValue(), style.getDataFormat(),
+                            style.getDataFormatString() ) );
+                }
+                break;
+            case HSSFCell.CELL_TYPE_BOOLEAN:
+                value = String.valueOf( cell.getBooleanCellValue() );
+                break;
+            case HSSFCell.CELL_TYPE_ERROR:
+                value = ErrorEval.getText( cell.getErrorCellValue() );
+                break;
+            default:
+                logger.log(
+                        POILogger.WARN,
+                        "Unexpected cell cachedFormulaResultType ("
+                                + cell.getCachedFormulaResultType() + ")" );
+                value = ExcelToHtmlUtils.EMPTY;
+                break;
+            }
+            break;
+        case HSSFCell.CELL_TYPE_BLANK:
+            value = ExcelToHtmlUtils.EMPTY;
+            break;
+        case HSSFCell.CELL_TYPE_NUMERIC:
+            value = _formatter.formatCellValue( cell );
+            break;
+        case HSSFCell.CELL_TYPE_BOOLEAN:
+            value = String.valueOf( cell.getBooleanCellValue() );
+            break;
+        case HSSFCell.CELL_TYPE_ERROR:
+            value = ErrorEval.getText( cell.getErrorCellValue() );
+            break;
+        default:
+            logger.log( POILogger.WARN,
+                    "Unexpected cell type (" + cell.getCellType() + ")" );
+            return true;
+        }
+
+        final short cellStyleIndex = cellStyle.getIndex();
+        if ( cellStyleIndex != 0 )
+        {
+            tableCellElement.setAttribute( "class", "cellstyle_"
+                    + cellStyleIndex );
+            usedStyles.add( Short.valueOf( cellStyleIndex ) );
+            if ( ExcelToHtmlUtils.isEmpty( value ) )
+            {
+                /*
+                 * if cell style is defined (like borders, etc.) but cell text
+                 * is empty, add "&nbsp;" to output, so browser won't collapse
+                 * and ignore cell
+                 */
+                value = "\u00A0";
+            }
+        }
+
+        Text text = htmlDocumentFacade.createText( value );
+        tableCellElement.appendChild( text );
+
+        return ExcelToHtmlUtils.isEmpty( value ) && cellStyleIndex == 0;
+    }
+
+    protected boolean processRow( HSSFRow row, Element tableRowElement )
+    {
+        boolean emptyRow = true;
+
+        final short maxColIx = row.getLastCellNum();
+        if ( maxColIx <= 0 )
+            return true;
+
+        final List<Element> emptyCells = new ArrayList<Element>( maxColIx );
+
+        for ( int colIx = 0; colIx < maxColIx; colIx++ )
+        {
+            HSSFCell cell = row.getCell( colIx );
+
+            Element tableCellElement = htmlDocumentFacade.createTableCell();
+
+            boolean emptyCell;
+            if ( cell != null )
+            {
+                emptyCell = processCell( cell, tableCellElement );
+            }
+            else
+            {
+                emptyCell = true;
+            }
+
+            if ( emptyCell )
+            {
+                emptyCells.add( tableCellElement );
+            }
+            else
+            {
+                for ( Element emptyCellElement : emptyCells )
+                {
+                    tableRowElement.appendChild( emptyCellElement );
+                }
+                emptyCells.clear();
+
+                tableRowElement.appendChild( tableCellElement );
+                emptyRow = false;
+            }
+        }
+
+        return emptyRow;
+    }
+
+    protected void processSheet( HSSFSheet sheet )
+    {
+        Element h1 = htmlDocumentFacade.createHeader1();
+        h1.appendChild( htmlDocumentFacade.createText( sheet.getSheetName() ) );
+        htmlDocumentFacade.getBody().appendChild( h1 );
+
+        final int physicalNumberOfRows = sheet.getPhysicalNumberOfRows();
+        if ( physicalNumberOfRows <= 0 )
+            return;
+
+        Element table = htmlDocumentFacade.createTable();
+        Element tableBody = htmlDocumentFacade.createTableBody();
+
+        final List<Element> emptyRowElements = new ArrayList<Element>(
+                physicalNumberOfRows );
+
+        for ( int r = 0; r < physicalNumberOfRows; r++ )
+        {
+            HSSFRow row = sheet.getRow( r );
+
+            Element tableRowElement = htmlDocumentFacade.createTableRow();
+
+            boolean emptyRow;
+            if ( row != null )
+            {
+                emptyRow = processRow( row, tableRowElement );
+            }
+            else
+            {
+                emptyRow = true;
+            }
+
+            if ( emptyRow )
+            {
+                emptyRowElements.add( tableRowElement );
+            }
+            else
+            {
+                if ( !emptyRowElements.isEmpty() )
+                {
+                    for ( Element emptyCellElement : emptyRowElements )
+                    {
+                        tableBody.appendChild( emptyCellElement );
+                    }
+                    emptyRowElements.clear();
+                }
+
+                tableBody.appendChild( tableRowElement );
+                emptyRow = false;
+            }
+        }
+
+        table.appendChild( tableBody );
+        htmlDocumentFacade.getBody().appendChild( table );
+    }
+
+    public void processWorkbook( HSSFWorkbook workbook )
+    {
+        for ( short i = 0; i < workbook.getNumCellStyles(); i++ )
+        {
+            HSSFCellStyle cellStyle = workbook.getCellStyleAt( i );
+
+            if ( cellStyle == null )
+                continue;
+
+            if ( usedStyles.contains( Short.valueOf( i ) ) )
+                styles.appendChild( htmlDocumentFacade
+                        .createText( "td.cellstyle_" + i + "{"
+                                + buildStyle( workbook, cellStyle ) + "}\n" ) );
+        }
+
+        for ( int s = 0; s < workbook.getNumberOfSheets(); s++ )
+        {
+            HSSFSheet sheet = workbook.getSheetAt( s );
+            processSheet( sheet );
+        }
+    }
+}

src/scratchpad/src/org/apache/poi/hssf/usermodel/converter/ExcelToHtmlUtils.java

@@ -0,0 +1,119 @@
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+package org.apache.poi.hssf.usermodel.converter;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+
+import org.apache.poi.hssf.usermodel.HSSFCellStyle;
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.hssf.util.HSSFColor;
+import org.apache.poi.util.IOUtils;
+
+public class ExcelToHtmlUtils
+{
+    static final String EMPTY = "";
+
+    public static String getBorderStyle( short xlsBorder )
+    {
+        final String borderStyle;
+        switch ( xlsBorder )
+        {
+        case HSSFCellStyle.BORDER_NONE:
+            borderStyle = "none";
+            break;
+        case HSSFCellStyle.BORDER_DASH_DOT:
+        case HSSFCellStyle.BORDER_DASH_DOT_DOT:
+        case HSSFCellStyle.BORDER_DOTTED:
+        case HSSFCellStyle.BORDER_HAIR:
+        case HSSFCellStyle.BORDER_MEDIUM_DASH_DOT:
+        case HSSFCellStyle.BORDER_MEDIUM_DASH_DOT_DOT:
+        case HSSFCellStyle.BORDER_SLANTED_DASH_DOT:
+            borderStyle = "dotted";
+            break;
+        case HSSFCellStyle.BORDER_DASHED:
+        case HSSFCellStyle.BORDER_MEDIUM_DASHED:
+            borderStyle = "dashed";
+            break;
+        case HSSFCellStyle.BORDER_DOUBLE:
+            borderStyle = "double";
+            break;
+        default:
+            borderStyle = "solid";
+            break;
+        }
+        return borderStyle;
+    }
+
+    public static String getBorderWidth( short xlsBorder )
+    {
+        final String borderWidth;
+        switch ( xlsBorder )
+        {
+        case HSSFCellStyle.BORDER_MEDIUM_DASH_DOT:
+        case HSSFCellStyle.BORDER_MEDIUM_DASH_DOT_DOT:
+        case HSSFCellStyle.BORDER_MEDIUM_DASHED:
+            borderWidth = "2pt";
+            break;
+        case HSSFCellStyle.BORDER_THICK:
+            borderWidth = "thick";
+            break;
+        default:
+            borderWidth = "thin";
+            break;
+        }
+        return borderWidth;
+    }
+
+    public static String getColor( HSSFColor color )
+    {
+        StringBuilder stringBuilder = new StringBuilder();
+        for ( short s : color.getTriplet() )
+        {
+            if ( s < 10 )
+                stringBuilder.append( '0' );
+
+            stringBuilder.append( Integer.toHexString( s ) );
+        }
+        return stringBuilder.toString();
+    }
+
+    static boolean isEmpty( String str )
+    {
+        return str == null || str.length() == 0;
+    }
+
+    static boolean isNotEmpty( String str )
+    {
+        return !isEmpty( str );
+    }
+
+    public static HSSFWorkbook loadXls( File xlsFile ) throws IOException
+    {
+        final FileInputStream inputStream = new FileInputStream( xlsFile );
+        try
+        {
+            return new HSSFWorkbook( inputStream );
+        }
+        finally
+        {
+            IOUtils.closeQuietly( inputStream );
+        }
+    }
+
+}

src/scratchpad/src/org/apache/poi/hwpf/converter/AbstractWordUtils.java

@@ -16,7 +16,6 @@
 ==================================================================== */
 package org.apache.poi.hwpf.converter;
 
-import java.io.Closeable;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
@@ -42,32 +41,15 @@ import org.apache.poi.hwpf.usermodel.Section;
 import org.apache.poi.hwpf.usermodel.SectionProperties;
 import org.apache.poi.hwpf.usermodel.TableIterator;
 import org.apache.poi.poifs.filesystem.POIFSFileSystem;
-import org.apache.poi.util.POILogFactory;
-import org.apache.poi.util.POILogger;
+import org.apache.poi.util.IOUtils;
 
 public class AbstractWordUtils
 {
     static final String EMPTY = "";
 
-    private static final POILogger logger = POILogFactory
-            .getLogger( AbstractWordUtils.class );
-
     public static final float TWIPS_PER_INCH = 1440.0f;
     public static final int TWIPS_PER_PT = 20;
 
-    static void closeQuietly( final Closeable closeable )
-    {
-        try
-        {
-            closeable.close();
-        }
-        catch ( Exception exc )
-        {
-            logger.log( POILogger.ERROR, "Unable to close resource: " + exc,
-                    exc );
-        }
-    }
-
     static boolean equals( String str1, String str2 )
     {
         return str1 == null ? str2 == null : str1.equals( str2 );
@@ -367,7 +349,7 @@ public class AbstractWordUtils
         }
         finally
         {
-            closeQuietly( istream );
+            IOUtils.closeQuietly( istream );
         }
     }
 

src/scratchpad/src/org/apache/poi/hwpf/converter/HtmlDocumentFacade.java

@@ -42,6 +42,11 @@ public class HtmlDocumentFacade
         html.appendChild( body );
     }
 
+    public Element createHeader1()
+    {
+        return document.createElement( "h1" );
+    }
+
     public Element createHyperlink( String internalDestination )
     {
         final Element basicLink = document.createElement( "a" );
@@ -99,9 +104,19 @@ public class HtmlDocumentFacade
         return document.createElement( "ul" );
     }
 
+    public Element getBody()
+    {
+        return body;
+    }
+
     public Document getDocument()
     {
         return document;
     }
 
+    public Element getHead()
+    {
+        return head;
+    }
+
 }

src/scratchpad/testcases/org/apache/poi/hssf/converter/TestExcelToHtmlConverterSuite.java

@@ -0,0 +1,108 @@
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+package org.apache.poi.hssf.converter;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.io.StringWriter;
+import java.util.Arrays;
+import java.util.List;
+
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+import org.apache.poi.POIDataSamples;
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.hssf.usermodel.converter.ExcelToHtmlConverter;
+import org.apache.poi.hssf.usermodel.converter.ExcelToHtmlUtils;
+
+public class TestExcelToHtmlConverterSuite
+{
+    /**
+     * YK: a quick hack to exclude failing documents from the suite.
+     */
+    private static List<String> failingFiles = Arrays.asList();
+
+    public static Test suite()
+    {
+        TestSuite suite = new TestSuite();
+
+        File directory = POIDataSamples.getSpreadSheetInstance().getFile(
+                "../spreadsheet" );
+        for ( final File child : directory.listFiles( new FilenameFilter()
+        {
+            public boolean accept( File dir, String name )
+            {
+                return name.endsWith( ".xls" ) && !failingFiles.contains( name );
+            }
+        } ) )
+        {
+            final String name = child.getName();
+            suite.addTest( new TestCase( name + " [HTML]" )
+            {
+                public void runTest() throws Exception
+                {
+                    test( child, true );
+                }
+            } );
+
+        }
+
+        return suite;
+    }
+
+    protected static void test( File child, boolean html ) throws Exception
+    {
+        HSSFWorkbook workbook;
+        try
+        {
+            workbook = ExcelToHtmlUtils.loadXls( child );
+        }
+        catch ( Exception exc )
+        {
+            // unable to parse file -- not WordToFoConverter fault
+            return;
+        }
+
+        ExcelToHtmlConverter excelToHtmlConverter = new ExcelToHtmlConverter(
+                DocumentBuilderFactory.newInstance().newDocumentBuilder()
+                        .newDocument() );
+        excelToHtmlConverter.processWorkbook( workbook );
+
+        StringWriter stringWriter = new StringWriter();
+
+        Transformer transformer = TransformerFactory.newInstance()
+                .newTransformer();
+        transformer.setOutputProperty( OutputKeys.ENCODING, "utf-8" );
+        transformer.setOutputProperty( OutputKeys.INDENT, "yes" );
+        transformer.transform(
+                new DOMSource( excelToHtmlConverter.getDocument() ),
+                new StreamResult( stringWriter ) );
+
+        if ( html )
+            transformer.setOutputProperty( OutputKeys.METHOD, "html" );
+
+        // no exceptions
+    }
+}