private File getCachedImage(File file, int size) throws IOException {
String md5 = DigestUtils.md5Hex(file.getPath());
File cachedImage = new File(getImageCacheDirectory(size), md5 + ".jpeg");
// Is cache missing or obsolete?
if (!cachedImage.exists() || FileUtil.lastModified(file) > cachedImage.lastModified()) {
InputStream in = null;
OutputStream out = null;
try {
in = getImageInputStream(file);
out = new FileOutputStream(cachedImage);
BufferedImage image = ImageIO.read(in);
if (image == null) {
throw new Exception("Unable to decode image.");
}
image = scale(image, size, size);
ImageIO.write(image, "jpeg", out);
} catch (Throwable x) {
// Delete corrupt (probably empty) thumbnail cache.
LOG.warn("Failed to create thumbnail for " + file, x);
IOUtils.closeQuietly(out);
cachedImage.delete();
throw new IOException("Failed to create thumbnail for " + file + ". " + x.getMessage());
} finally {
IOUtils.closeQuietly(in);
IOUtils.closeQuietly(out);
}
}
return cachedImage;
}
public long getLastModified(HttpServletRequest request) {
String path = request.getParameter("path");
if (StringUtils.trimToNull(path) == null) {
return 0;
}
File file = new File(path);
if (!FileUtil.exists(file)) {
return -1;
}
return FileUtil.lastModified(file);
}
public long getLastModified(HttpServletRequest request) {
try {
File file = getImageFile(request);
if (file == null) {
return 0; // Request for the default image.
}
if (!FileUtil.exists(file)) {
return -1;
}
return FileUtil.lastModified(file);
} catch (Exception e) {
return -1;
}
}