private final Map<String, PackageResource> imagesByName = Maps.newHashMap();
@Override
public PackageResource findImage(final ObjectSpecification noSpec) {
final String specFullName = noSpec.getFullIdentifier();
final PackageResource packageResource = findImage(specFullName);
if (packageResource != null) {
return packageResource;
} else {
return findAndCacheImage(noSpec);
}