public void setDelegates(List<ModuleOptionsMetadataResolver> delegates) {
		Assert.notEmpty(delegates, "at least one delegate resolver is required");
		this.delegates = delegates;
	}
A {@link ModuleOptionsMetadataResolver} that will invoke several other {@link ModuleOptionsMetadataResolver}
instances in turn and merge their results (flattening them).

@author Eric Bottard
spring-xd-module/src/main/java/org/springframework/xd/module/options/DelegatingModuleOptionsMetadataResolver.java