edu.jhu.pha.vospace.process.tika.ExcelParser.java Source code

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/*******************************************************************************
 * Copyright 2013 Johns Hopkins University
 * 
 * Licensed 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 edu.jhu.pha.vospace.process.tika;

import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
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.usermodel.WorkbookFactory;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.TikaCoreProperties;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.Parser;
import org.apache.tika.sax.XHTMLContentHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

public class ExcelParser implements Parser {
    private static final Set<MediaType> SUPPORTED_TYPES = new HashSet<MediaType>();

    static {
        SUPPORTED_TYPES.add(MediaType.application("vnd.openxmlformats-officedocument.spreadsheetml.sheet"));
        SUPPORTED_TYPES.add(MediaType.application("vnd.ms-excel"));
    }

    @Override
    public Set<MediaType> getSupportedTypes(ParseContext arg0) {
        return SUPPORTED_TYPES;
    }

    @Override
    public void parse(InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context)
            throws IOException, SAXException, TikaException {

        XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
        xhtml.startDocument();

        Workbook wb;

        try {
            wb = WorkbookFactory.create(stream);
        } catch (InvalidFormatException e) {
            throw new TikaException("Invalid format");
        }

        Sheet sheet = wb.getSheetAt(0);
        int nRows = sheet.getLastRowNum();
        int nCols = sheet.getRow(0).getLastCellNum();
        xhtml.startElement("section", "id", String.valueOf(1));

        AttributesImpl attributes = new AttributesImpl();
        //attributes.addAttribute("", "id", "id", "CDATA", String.valueOf(1));
        attributes.addAttribute("", "columns", "columns", "CDATA", String.valueOf(nCols));
        xhtml.startElement("table", attributes);

        Row headerRow = sheet.getRow(0);
        xhtml.startElement("th", "info", "columnNames");
        for (int j = 0; j < nCols; j++) {
            Cell cell = headerRow.getCell(j);
            String columnName = cell.getStringCellValue();
            xhtml.element("td", columnName);
        }
        xhtml.endElement("th");
        Row firstDataRow = sheet.getRow(1);
        xhtml.startElement("th", "info", "columnTypes");
        for (int j = 0; j < nCols; j++) {
            Cell cell = firstDataRow.getCell(j);
            int type = cell.getCellType();
            String columnType = null;
            switch (type) {
            case Cell.CELL_TYPE_NUMERIC:
                columnType = "D";
                break;
            case Cell.CELL_TYPE_STRING:
                columnType = "A";
                break;
            }
            xhtml.element("td", columnType);
        }
        xhtml.endElement("th");

        for (int i = 1; i <= nRows; i++) {
            Row row = sheet.getRow(i);
            xhtml.startElement("tr");
            for (int j = 0; j < nCols; j++) {
                Cell cell = row.getCell(j);
                int type = cell.getCellType();
                switch (type) {
                case Cell.CELL_TYPE_NUMERIC:
                    xhtml.element("td", String.valueOf(cell.getNumericCellValue()));
                    break;
                case Cell.CELL_TYPE_STRING:
                    xhtml.element("td", cell.getStringCellValue());
                    break;
                }
            }
            xhtml.endElement("tr");

        }
        xhtml.endElement("table");
        xhtml.endElement("section");
        xhtml.endDocument();

        metadata.add(TikaCoreProperties.TYPE, "EXCEL");
    }
}