Examples with XSSFRelation org.apache.poi.xssf.usermodel.XSSFRelation used on opensource projects

Example 1 with XSSFRelation

use of org.apache.poi.xssf.usermodel.XSSFRelation in project poi by apache.

the class ExtractorFactory method createExtractor.

/**
     * Tries to determine the actual type of file and produces a matching text-extractor for it.
     *
     * @param pkg An {@link OPCPackage}.
     * @return A {@link POIXMLTextExtractor} for the given file.
     * @throws IOException If an error occurs while reading the file 
     * @throws OpenXML4JException If an error parsing the OpenXML file format is found. 
     * @throws XmlException If an XML parsing error occurs.
     * @throws IllegalArgumentException If no matching file type could be found.
     */
public static POIXMLTextExtractor createExtractor(OPCPackage pkg) throws IOException, OpenXML4JException, XmlException {
    try {
        // Check for the normal Office core document
        PackageRelationshipCollection core;
        core = pkg.getRelationshipsByType(CORE_DOCUMENT_REL);
        // If nothing was found, try some of the other OOXML-based core types
        if (core.size() == 0) {
            // Could it be an OOXML-Strict one?
            core = pkg.getRelationshipsByType(STRICT_DOCUMENT_REL);
        }
        if (core.size() == 0) {
            // Could it be a visio one?
            core = pkg.getRelationshipsByType(VISIO_DOCUMENT_REL);
            if (core.size() == 1)
                return new XDGFVisioExtractor(pkg);
        }
        // Should just be a single core document, complain if not
        if (core.size() != 1) {
            throw new IllegalArgumentException("Invalid OOXML Package received - expected 1 core document, found " + core.size());
        }
        // Grab the core document part, and try to identify from that
        final PackagePart corePart = pkg.getPart(core.getRelationship(0));
        final String contentType = corePart.getContentType();
        // Is it XSSF?
        for (XSSFRelation rel : XSSFExcelExtractor.SUPPORTED_TYPES) {
            if (rel.getContentType().equals(contentType)) {
                if (getPreferEventExtractor()) {
                    return new XSSFEventBasedExcelExtractor(pkg);
                }
                return new XSSFExcelExtractor(pkg);
            }
        }
        // Is it XWPF?
        for (XWPFRelation rel : XWPFWordExtractor.SUPPORTED_TYPES) {
            if (rel.getContentType().equals(contentType)) {
                return new XWPFWordExtractor(pkg);
            }
        }
        // Is it XSLF?
        for (XSLFRelation rel : XSLFPowerPointExtractor.SUPPORTED_TYPES) {
            if (rel.getContentType().equals(contentType)) {
                return new XSLFPowerPointExtractor(pkg);
            }
        }
        // special handling for SlideShow-Theme-files, 
        if (XSLFRelation.THEME_MANAGER.getContentType().equals(contentType)) {
            return new XSLFPowerPointExtractor(new XSLFSlideShow(pkg));
        }
        // How about xlsb?
        for (XSSFRelation rel : XSSFBEventBasedExcelExtractor.SUPPORTED_TYPES) {
            if (rel.getContentType().equals(contentType)) {
                return new XSSFBEventBasedExcelExtractor(pkg);
            }
        }
        throw new IllegalArgumentException("No supported documents found in the OOXML package (found " + contentType + ")");
    } catch (IOException e) {
        // ensure that we close the package again if there is an error opening it, however
        // we need to revert the package to not re-write the file via close(), which is very likely not wanted for a TextExtractor!
        pkg.revert();
        throw e;
    } catch (OpenXML4JException e) {
        // ensure that we close the package again if there is an error opening it, however
        // we need to revert the package to not re-write the file via close(), which is very likely not wanted for a TextExtractor!
        pkg.revert();
        throw e;
    } catch (XmlException e) {
        // ensure that we close the package again if there is an error opening it, however
        // we need to revert the package to not re-write the file via close(), which is very likely not wanted for a TextExtractor!
        pkg.revert();
        throw e;
    } catch (RuntimeException e) {
        // ensure that we close the package again if there is an error opening it, however
        // we need to revert the package to not re-write the file via close(), which is very likely not wanted for a TextExtractor!
        pkg.revert();
        throw e;
    }
}