RandomSec/main/src/com/google/refine/exporters/XlsExporter.java

/*

Copyright 2010,2011 Google Inc.
All rights reserved.

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modification, are permitted provided that the following conditions are
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    * Redistributions of source code must retain the above copyright
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    * Redistributions in binary form must reproduce the above
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in the documentation and/or other materials provided with the
distribution.
    * Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/

package com.google.refine.exporters;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Properties;

import org.apache.poi.hssf.usermodel.HSSFHyperlink;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.WorkbookUtil;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.json.JSONObject;

import com.google.refine.ProjectManager;
import com.google.refine.browsing.Engine;
import com.google.refine.model.Project;

public class XlsExporter implements StreamExporter {
    final private boolean xml;
    
    public XlsExporter(boolean xml) {
        this.xml = xml;
    }
    
    @Override
    public String getContentType() {
        return xml ? "application/xlsx" : "application/xls";
    }

    @Override
    public void export(final Project project, Properties params, Engine engine,
            OutputStream outputStream) throws IOException {

        final Workbook wb = xml ? new XSSFWorkbook() : new HSSFWorkbook();
        
        TabularSerializer serializer = new TabularSerializer() {
            Sheet s;
            int rowCount = 0;
            CellStyle dateStyle;
            
            @Override
            public void startFile(JSONObject options) {
                s = wb.createSheet();
                String sheetName = WorkbookUtil.createSafeSheetName(
                        ProjectManager.singleton.getProjectMetadata(project.id).getName());
                wb.setSheetName(0, sheetName);

                dateStyle = wb.createCellStyle();
                dateStyle.setDataFormat(
                        wb.getCreationHelper().createDataFormat().getFormat("YYYY-MM-DD")); // TODO what format here?
            }

            @Override
            public void endFile() {
            }

            @Override
            public void addRow(List<CellData> cells, boolean isHeader) {
                Row r = s.createRow(rowCount++);
                
                for (int i = 0; i < cells.size(); i++) {
                    Cell c = r.createCell(i);
                    if (i == 255 && cells.size() > 256) {
                        c.setCellValue("ERROR: TOO MANY COLUMNS");
                        break;
                    } else {
                        CellData cellData = cells.get(i);
                        
                        if (cellData != null && cellData.text != null && cellData.value != null) {
                            Object v = cellData.value;
                            if (v instanceof Number) {
                                c.setCellValue(((Number) v).doubleValue());
                            } else if (v instanceof Boolean) {
                                c.setCellValue(((Boolean) v).booleanValue());
                            } else if (v instanceof Date) {
                                c.setCellValue((Date) v);
                                c.setCellStyle(dateStyle);
                            } else if (v instanceof Calendar) {
                                c.setCellValue((Calendar) v);
                                c.setCellStyle(dateStyle);
                            } else {
                                String s = cellData.text;
                                if (s.length() > 32767) {
                                    // The maximum length of cell contents (text) is 32,767 characters
                                    s = s.substring(0, 32767);
                                }
                                c.setCellValue(s);
                            }
                            
                            if (cellData.link != null) {
                                HSSFHyperlink hl = new HSSFHyperlink(HSSFHyperlink.LINK_URL);
                                hl.setLabel(cellData.text);
                                hl.setAddress(cellData.link);
                            }
                        }

                    }
                }
            }
        };
        
        CustomizableTabularExporterUtilities.exportRows(
                project, engine, params, serializer);
        
        wb.write(outputStream);
        outputStream.flush();
    }

}