private static List<Resource> getResourcesSortedById(final Book book) {
List<Resource> resources = new ArrayList<>(book.getResources().getAll());
Collections.sort(
resources,
(Resource resource1, Resource resource2) ->
resource1.getId().compareToIgnoreCase(resource2.getId()));
return resources;
}
public Image get(Object key) {
try {
if (book == null) {
return null;
}
String imageURL = key.toString();
// see if the image is already in the cache
Image result = cache.get(imageURL);
if (result != null) {
return result;
}
// get the image resource href
String resourceHref = getResourceHref(imageURL);
// find the image resource in the book resources
Resource imageResource = book.getResources().getByHref(resourceHref);
if (imageResource == null) {
return result;
}
// create an image from the resource and add it to the cache
result = createImage(imageResource);
if (result != null) {
cache.put(imageURL.toString(), result);
}
return result;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}