/**
* If pictures is not null, add a list of images of the given primary type to the described
* object. If no images of the primary type are found, fall back to the first, or optional second
* type. Only one (the first) fallback image will be used. Ordering is preserved for images. If
* pictures is null, this method does nothing.
*
* @param pictures The picture collection to use
* @param described The object that will have images added
* @param primaryImageType The primary image type to add
* @param firstFallbackType The preferred fallback image type to add
* @param secondFallbackType The optional fallback image type to add
*/
void selectImages(
Pictures pictures,
Described described,
String primaryImageType,
String firstFallbackType,
Maybe<String> secondFallbackType) {
if (pictures != null) {
Set<Image> images = Sets.newLinkedHashSet();
Image fallbackImage = null;
boolean hasFirstFallbackType = false;
for (PictureUsage picture : pictures.getPictureUsage()) {
Image image = createImage(picture);
if (secondFallbackType.hasValue()
&& picture.getType().equals(secondFallbackType.requireValue())
&& images.isEmpty()
&& fallbackImage == null) {
setPrimaryImage(described, image, picture);
fallbackImage = image;
}
if (picture.getType().equals(firstFallbackType)
&& images.isEmpty()
&& !hasFirstFallbackType) {
setPrimaryImage(described, image, picture);
fallbackImage = image;
hasFirstFallbackType = true;
}
if (picture.getType().equals(primaryImageType)) {
if (images.size() == 0) {
setPrimaryImage(described, image, picture);
}
images.add(image);
}
}
if (!images.isEmpty()) {
described.setImages(images);
} else if (fallbackImage != null) {
described.setImages(ImmutableSet.of(fallbackImage));
}
}
}
