Examples with SeekableStream org.apache.xmlgraphics.image.codec.util.SeekableStream used on opensource projects

Example 1 with SeekableStream

use of org.apache.xmlgraphics.image.codec.util.SeekableStream in project graphhopper by graphhopper.

the class CGIARProvider method getEle.

@Override
public double getEle(double lat, double lon) {
    // no data we can avoid the trouble
    if (lat > 60 || lat < -60)
        return 0;
    lat = (int) (lat * precision) / precision;
    lon = (int) (lon * precision) / precision;
    String name = getFileName(lat, lon);
    HeightTile demProvider = cacheData.get(name);
    if (demProvider == null) {
        if (!cacheDir.exists())
            cacheDir.mkdirs();
        int minLat = down(lat);
        int minLon = down(lon);
        // less restrictive against boundary checking
        demProvider = new HeightTile(minLat, minLon, WIDTH, degree * precision, degree);
        demProvider.setCalcMean(calcMean);
        cacheData.put(name, demProvider);
        DataAccess heights = getDirectory().find(name + ".gh");
        demProvider.setHeights(heights);
        boolean loadExisting = false;
        try {
            loadExisting = heights.loadExisting();
        } catch (Exception ex) {
            logger.warn("cannot load " + name + ", error: " + ex.getMessage());
        }
        if (!loadExisting) {
            String tifName = name + ".tif";
            String zippedURL = baseUrl + "/" + name + ".zip";
            File file = new File(cacheDir, new File(zippedURL).getName());
            // get zip file if not already in cacheDir - unzip later and in-memory only!
            if (!file.exists()) {
                try {
                    int max = 3;
                    for (int trial = 0; trial < max; trial++) {
                        try {
                            downloader.downloadFile(zippedURL, file.getAbsolutePath());
                            break;
                        } catch (SocketTimeoutException ex) {
                            // just try again after a little nap
                            Thread.sleep(sleep);
                            if (trial >= max - 1)
                                throw ex;
                            continue;
                        } catch (IOException ex) {
                            demProvider.setSeaLevel(true);
                            // use small size on disc and in-memory
                            heights.setSegmentSize(100).create(10).flush();
                            return 0;
                        }
                    }
                } catch (Exception ex) {
                    throw new RuntimeException(ex);
                }
            }
            // short == 2 bytes
            heights.create(2 * WIDTH * WIDTH);
            // logger.info("start decoding");
            // decode tiff data
            Raster raster;
            SeekableStream ss = null;
            try {
                InputStream is = new FileInputStream(file);
                ZipInputStream zis = new ZipInputStream(is);
                // find tif file in zip
                ZipEntry entry = zis.getNextEntry();
                while (entry != null && !entry.getName().equals(tifName)) {
                    entry = zis.getNextEntry();
                }
                ss = SeekableStream.wrapInputStream(zis, true);
                TIFFImageDecoder imageDecoder = new TIFFImageDecoder(ss, new TIFFDecodeParam());
                raster = imageDecoder.decodeAsRaster();
            } catch (Exception e) {
                throw new RuntimeException("Can't decode " + tifName, e);
            } finally {
                if (ss != null)
                    Helper.close(ss);
            }
            // logger.info("start converting to our format");
            final int height = raster.getHeight();
            final int width = raster.getWidth();
            int x = 0, y = 0;
            try {
                for (y = 0; y < height; y++) {
                    for (x = 0; x < width; x++) {
                        short val = (short) raster.getPixel(x, y, (int[]) null)[0];
                        if (val < -1000 || val > 12000)
                            val = Short.MIN_VALUE;
                        heights.setShort(2 * (y * WIDTH + x), val);
                    }
                }
                heights.flush();
            // TODO remove tifName and zip?
            } catch (Exception ex) {
                throw new RuntimeException("Problem at x:" + x + ", y:" + y, ex);
            }
        }
    // loadExisting
    }
    if (demProvider.isSeaLevel())
        return 0;
    return demProvider.getHeight(lat, lon);
}