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use protobuf::well_known_types::{ListValue, Value};
use protobuf::RepeatedField;
use google::spanner::v1::keys;
/// Identify range of table rows via start/end points.
#[derive(Clone)]
pub struct KeyRange {
start_open: Vec<String>,
start_closed: Vec<String>,
end_open: Vec<String>,
end_closed: Vec<String>
}
impl KeyRange {
/// Initializes a new KeyRange.
///
/// Specify either a `start_open` or `start_closed` key, or
/// defaults to `start_closed = Vec::new();`. Specify either
/// an `end_open` or `end_closed` key, or defaults to
/// `end_closed = Vec::new();`. However, at least one key
/// has to be specified. If no keys are specified, it'll panic.
///
/// # Arguments
///
/// * `start_open` - Keys identifying start of range (this key excluded).
///
/// * `start_closed` - Keys identifying start of range (this key included).
///
/// * `end_open` - Keys identifying end of range (this key excluded).
///
/// * `end_closed` - Keys identifyind end of range (this key included).
///
/// # Return value
///
/// A new `KeyRange`.
///
/// # Panics
///
/// * If no keys are specified.
/// * If both `start_open`/`start_closed` are specified.
/// * If both `end_open`/`end_closed` are specified.
pub fn new(start_open: Option<Vec<String>>, start_closed: Option<Vec<String>>, end_open: Option<Vec<String>>, end_closed: Option<Vec<String>>) -> Self {
let so = start_open.unwrap_or(Vec::new());
let sc = start_closed.unwrap_or(Vec::new());
let eo = end_open.unwrap_or(Vec::new());
let ec = end_closed.unwrap_or(Vec::new());
if so.is_empty() && sc.is_empty() && ec.is_empty() && eo.is_empty() {
panic!("Must specify at least a start or end row");
}
if !so.is_empty() && !sc.is_empty() {
panic!("Specify one of 'start_open'/'start_closed'.");
}
if !eo.is_empty() && !ec.is_empty() {
panic!("Specify one of 'end_open'/'start_closed'.");
}
KeyRange {
start_open: so,
start_closed: sc,
end_open: eo,
end_closed: ec
}
}
/// Construct a KeyRange protobuf.
///
/// # Return value
///
/// Protobuf corresponding to this instance.
pub fn to_pb(&self) -> keys::KeyRange {
let mut kr = keys::KeyRange::new();
if !self.start_open.is_empty() {
kr.set_start_open(make_list_value_pb(&self.start_open));
}
if !self.start_closed.is_empty() {
kr.set_start_closed(make_list_value_pb(&self.start_closed));
}
if !self.end_open.is_empty() {
kr.set_end_open(make_list_value_pb(&self.end_open));
}
if !self.end_closed.is_empty() {
kr.set_end_closed(make_list_value_pb(&self.end_closed));
}
kr
}
}
/// Identify table rows via keys/ranges.
#[derive(Clone)]
pub struct KeySet {
keys: Vec<Vec<String>>,
ranges: Vec<KeyRange>,
all: bool
}
impl KeySet {
/// Initializes a new KeySet.
///
/// # Arguments
///
/// * `keys` - Keys identifying individual rows withing a table.
///
/// * `ranges` - Ranges identifying rows within a table.
///
/// * `all` - If True, identfy all rows within a table.
///
/// # Return value
///
/// A new `KeySet`.
pub fn new(keys: Option<Vec<String>>, ranges: Option<Vec<KeyRange>>, all: Option<bool>) -> Self {
let k = keys.unwrap_or(Vec::new());
let r = ranges.unwrap_or(Vec::new());
let a = all.unwrap_or(false);
if a && (!k.is_empty() || !r.is_empty()) {
panic!("'all' is exclusive of 'keys'/'ranges'.");
}
KeySet {
keys: vec![k],
ranges: r,
all: a
}
}
/// Construct a KeySet protobuf.
///
/// # Return value
///
/// Protobuf corresponding to this instance.
pub fn to_pb(&self) -> keys::KeySet {
let mut r = keys::KeySet::new();
r.set_all(self.all);
if !self.ranges.is_empty() {
r.set_ranges(RepeatedField::from_vec(self.make_ranges_to_pb()));
}
if !self.keys.is_empty() {
r.set_keys(make_list_value_pbs(&self.keys));
}
r
}
/// Helper method for `to_pb`
fn make_ranges_to_pb(&self) -> Vec<keys::KeyRange> {
self.ranges.iter().map(|kr| kr.to_pb()).collect()
}
}
/// Helper method for `to_pb`
fn make_list_value_pb(values: &Vec<String>) -> ListValue {
let mut lv = ListValue::new();
let a = values.iter().map(|v| {
make_value(v.to_string())
}).collect();
lv.set_values(RepeatedField::from_vec(a));
lv
}
/// Helper method for `to_pb`
fn make_list_value_pbs(values: &Vec<Vec<String>>) -> RepeatedField<ListValue> {
let a = values.iter().map(|v| {
make_list_value_pb(v)
}).collect();
RepeatedField::from_vec(a)
}
/// Helper method for `to_pb`
fn make_value(value: String) -> Value {
let mut v = Value::new();
v.set_string_value(value);
v
}