Example usage for javax.imageio ImageIO getImageReaders

Introduction

In this page you can find the example usage for javax.imageio ImageIO getImageReaders.

Prototype

public static Iterator<ImageReader> getImageReaders(Object input)

Source Link

Document

Returns an Iterator containing all currently registered ImageReader s that claim to be able to decode the supplied Object , typically an ImageInputStream .

Usage

From source file:de.cismet.cids.custom.objecteditors.wunda_blau.WebDavPicturePanel.java

/**
 * DOCUMENT ME!//from ww  w. j a v a 2 s  .c  o  m
 *
 * @param   fileName  DOCUMENT ME!
 *
 * @return  DOCUMENT ME!
 *
 * @throws  Exception  DOCUMENT ME!
 */
private BufferedImage downloadImageFromWebDAV(final String fileName) throws Exception {
    final InputStream iStream = webdavHelper.getFileFromWebDAV(fileName, webdavDirectory,
            getConnectionContext());
    try {
        final ImageInputStream iiStream = ImageIO.createImageInputStream(iStream);
        final Iterator<ImageReader> itReader = ImageIO.getImageReaders(iiStream);
        if (itReader.hasNext()) {
            final ImageReader reader = itReader.next();
            final ProgressMonitor monitor = new ProgressMonitor(this, "Bild wird bertragen...", "", 0, 100);
            //            monitor.setMillisToPopup(500);
            reader.addIIOReadProgressListener(new IIOReadProgressListener() {

                @Override
                public void sequenceStarted(final ImageReader source, final int minIndex) {
                }

                @Override
                public void sequenceComplete(final ImageReader source) {
                }

                @Override
                public void imageStarted(final ImageReader source, final int imageIndex) {
                    monitor.setProgress(monitor.getMinimum());
                }

                @Override
                public void imageProgress(final ImageReader source, final float percentageDone) {
                    if (monitor.isCanceled()) {
                        try {
                            iiStream.close();
                        } catch (final IOException ex) {
                            // NOP
                        }
                    } else {
                        monitor.setProgress(Math.round(percentageDone));
                    }
                }

                @Override
                public void imageComplete(final ImageReader source) {
                    monitor.setProgress(monitor.getMaximum());
                }

                @Override
                public void thumbnailStarted(final ImageReader source, final int imageIndex,
                        final int thumbnailIndex) {
                }

                @Override
                public void thumbnailProgress(final ImageReader source, final float percentageDone) {
                }

                @Override
                public void thumbnailComplete(final ImageReader source) {
                }

                @Override
                public void readAborted(final ImageReader source) {
                    monitor.close();
                }
            });

            final ImageReadParam param = reader.getDefaultReadParam();
            reader.setInput(iiStream, true, true);
            final BufferedImage result;
            try {
                result = reader.read(0, param);
            } finally {
                reader.dispose();
                iiStream.close();
            }
            return result;
        } else {
            return null;
        }
    } finally {
        IOUtils.closeQuietly(iStream);
    }
}

From source file:org.n52.v3d.terrainserver.povraywts.WebTerrainServlet.java

private BufferedImage prepareImage(ImageInputStream pImageIn, int pHeight, int pWidth, VgElevationGrid pTerrain,
        double pPitch, double pYaw, double pDistance, double pExaggeration, boolean pDrawNorthArrow,
        boolean pHints) {
    BufferedImage lImage = null;/* w w w  .  j a  v  a 2 s  .  co  m*/
    Iterator iter = ImageIO.getImageReaders(pImageIn); // liefert PNG-ImageReader
    ImageReader reader = (ImageReader) iter.next();
    reader.setInput(pImageIn, true); // seek forward only?

    boolean ready = false;
    int lMaxIntervalChecks = 40;
    long lCheckInterval = mRendererTimeout / lMaxIntervalChecks;
    int ct = 0;
    while ((!ready) && (ct < lMaxIntervalChecks)) {
        try {
            lImage = reader.read(0);
            ready = true;
        } catch (IOException e) {
            ct++;
            try {
                Thread.sleep(lCheckInterval);
            } catch (Exception e2) {
            }
            ;
        }
    }
    if (!ready)
        throw new T3dException("An I/O exception occured. The renderer did not generate an image file.", 403);

    // Copyright-Text und Nordpfeil ergnzen:
    this.addAnnotations(lImage, pHeight, pWidth, pPitch, pYaw, pDrawNorthArrow);
    // Ggf. weitere Information (Hints) ergnzen:
    if (pHints)
        this.addHints(lImage, pTerrain, pDistance, pYaw, pExaggeration);

    return lImage;
}

From source file:org.xwiki.contrib.ldap.XWikiLDAPUtils.java

/**
 * Guess image type of InputStream.//from   www  . j a  va  2 s  .co m
 * 
 * @param imageInputStream InputStream containing image.
 * @return type of image as String.
 */
protected String guessImageType(InputStream imageInputStream) {
    ImageInputStream imageStream;
    try {
        imageStream = ImageIO.createImageInputStream(imageInputStream);
    } catch (IOException ex) {
        LOGGER.error(ex.getMessage());
        return null;
    }

    Iterator<ImageReader> it = ImageIO.getImageReaders(imageStream);
    if (!it.hasNext()) {
        LOGGER.warn("No image readers found for provided stream.");
        return null;
    }

    ImageReader imageReader = it.next();
    imageReader.setInput(imageStream);

    try {
        return imageReader.getFormatName();
    } catch (IOException ex) {
        LOGGER.error(ex.getMessage());
        return null;
    } finally {
        imageReader.dispose();
    }
}