Example usage for org.apache.poi.sl.usermodel SlideShowFactory create

Introduction

In this page you can find the example usage for org.apache.poi.sl.usermodel SlideShowFactory create.

Prototype

public static <S extends Shape<S, P>, P extends TextParagraph<S, P, ? extends TextRun>> SlideShow<S, P> create(
        File file) throws IOException, EncryptedDocumentException 

Source Link

Document

Creates the appropriate HSLFSlideShow / XMLSlideShow from the given File, which must exist and be readable.

Usage

From source file:ddf.catalog.transformer.input.pptx.PptxInputTransformer.java

License:Open Source License

/**
 * SlideShowFactory.create() will perform the tests for password protected files.
 * <p/>/*from  ww w  .  j ava2s. c o m*/
 * Because Apache POI dynamically loads the classes needed to handle a PPTX file, the default
 * class loader is unable to find the dependencies during runtime. Therefore, the original class
 * loader is saved, then current class loader is set to this class's class loader, and finally
 * the original class loader is restored.
 *
 * @param metacard
 * @param input
 * @throws IOException
 */
private void extractThumbnail(Metacard metacard, InputStream input) throws IOException {

    ClassLoader originalContextClassLoader = Thread.currentThread().getContextClassLoader();
    try {
        Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
        SlideShow<?, ?> genericSlideShow = SlideShowFactory.create(input);

        if (genericSlideShow instanceof XMLSlideShow) {
            XMLSlideShow xmlSlideShow = (XMLSlideShow) genericSlideShow;

            byte[] thumbnail = generatePptxThumbnail(xmlSlideShow);
            if (thumbnail != null) {
                metacard.setAttribute(new AttributeImpl(Metacard.THUMBNAIL, thumbnail));
            }

        } else {
            LOGGER.debug("Cannot transform old style (OLE2) ppt : id = {}", metacard.getId());
        }

    } finally {
        Thread.currentThread().setContextClassLoader(originalContextClassLoader);
    }
}

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