private String getDefaultedRelFor(EmbeddedWrapper wrapper, boolean forCollection) { String valueRel = wrapper.getRel(); if (StringUtils.hasText(valueRel)) { return valueRel; } if (provider == null) { return DEFAULT_REL; } Class<?> type = wrapper.getRelTargetType(); if (type == null) { throw new IllegalStateException(String.format(INVALID_EMBEDDED_WRAPPER, wrapper)); } String rel = forCollection ? provider.getCollectionResourceRelFor(type) : provider.getItemResourceRelFor(type); if (curieProvider != null) { rel = curieProvider.getNamespacedRelFor(rel); } return rel == null ? DEFAULT_REL : rel; }