> + */
> + @Named("DeleteVault")
> + @DELETE
> + @Path("/-/vaults/{vault}")
> + @Fallback(FalseIfVaultNotEmpty.class)
> + ListenableFuture<Boolean> deleteVaultIfEmpty(@PathParam("vault")
> @ParamValidators(VaultNameValidator.class) String vaultName);
> +
> + /**
> + * @see GlacierClient#describeVault
> + */
> + @Named("DescribeVault")
> + @GET
> + @Path("/-/vaults/{vault}")
> + @ResponseParser(ParseVaultMetadataFromHttpContent.class)
> + ListenableFuture<VaultMetadata> describeVault(
> + @PathParam("vault") @ParamValidators(VaultNameValidator.class)
> String vaultName);
Should this fail if the vault does not exist or just return `null`? Many
jclouds providers have the convention to return `null` in that case. You can
easily do that by adding the following fallback:
```java
@Fallback(NullOnNotFoundOr404.class)
```
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