returns the bucketlifecycleconfiguration rule id for thisobject 's expiration , or null if it does n't expire . concode_field_sep String versionId concode_elem_sep String serverSideEncryption concode_elem_sep String expirationTimeRuleId concode_elem_sep Date expirationTime concode_elem_sep String eTag concode_field_sep void setServerSideEncryption concode_elem_sep String getVersionId concode_elem_sep void setVersionId concode_elem_sep Date getExpirationTime concode_elem_sep void setExpirationTimeRuleId concode_elem_sep String getETag concode_elem_sep void setExpirationTime concode_elem_sep String getServerSideEncryption concode_elem_sep void setETag
String function ( ) { return expirationTimeRuleId ; }