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|
use schema::Facet;
use serde::de::Visitor;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use std::fmt;
/// Value represents the value of a any field.
/// It is an enum over all over all of the possible field type.
#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd)]
pub enum Value {
/// The str type is used for any text information.
Str(String),
/// Unsigned 64-bits Integer `u64`
U64(u64),
/// Signed 64-bits Integer `i64`
I64(i64),
/// Hierarchical Facet
Facet(Facet),
/// Arbitrarily sized byte array
Bytes(Vec<u8>),
}
impl Serialize for Value {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
match *self {
Value::Str(ref v) => serializer.serialize_str(v),
Value::U64(u) => serializer.serialize_u64(u),
Value::I64(u) => serializer.serialize_i64(u),
Value::Facet(ref facet) => facet.serialize(serializer),
Value::Bytes(ref bytes) => serializer.serialize_bytes(bytes),
}
}
}
impl<'de> Deserialize<'de> for Value {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
struct ValueVisitor;
impl<'de> Visitor<'de> for ValueVisitor {
type Value = Value;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a string or u32")
}
fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E> {
Ok(Value::U64(v))
}
fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E> {
Ok(Value::I64(v))
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> {
Ok(Value::Str(v.to_owned()))
}
fn visit_string<E>(self, v: String) -> Result<Self::Value, E> {
Ok(Value::Str(v))
}
}
deserializer.deserialize_any(ValueVisitor)
}
}
impl Value {
/// Returns the text value, provided the value is of the `Str` type.
///
/// # Panics
/// If the value is not of type `Str`
pub fn text(&self) -> &str {
match *self {
Value::Str(ref text) => text,
_ => panic!("This is not a text field."),
}
}
/// Returns the u64-value, provided the value is of the `U64` type.
///
/// # Panics
/// If the value is not of type `U64`
pub fn u64_value(&self) -> u64 {
match *self {
Value::U64(ref value) => *value,
_ => panic!("This is not a text field."),
}
}
/// Returns the i64-value, provided the value is of the `I64` type.
///
/// # Panics
/// If the value is not of type `I64`
pub fn i64_value(&self) -> i64 {
match *self {
Value::I64(ref value) => *value,
_ => panic!("This is not a text field."),
}
}
}
impl From<String> for Value {
fn from(s: String) -> Value {
Value::Str(s)
}
}
impl From<u64> for Value {
fn from(v: u64) -> Value {
Value::U64(v)
}
}
impl From<i64> for Value {
fn from(v: i64) -> Value {
Value::I64(v)
}
}
impl<'a> From<&'a str> for Value {
fn from(s: &'a str) -> Value {
Value::Str(s.to_string())
}
}
impl<'a> From<Facet> for Value {
fn from(facet: Facet) -> Value {
Value::Facet(facet)
}
}
impl From<Vec<u8>> for Value {
fn from(bytes: Vec<u8>) -> Value {
Value::Bytes(bytes)
}
}
mod binary_serialize {
use super::Value;
use common::BinarySerializable;
use schema::Facet;
use std::io::{self, Read, Write};
const TEXT_CODE: u8 = 0;
const U64_CODE: u8 = 1;
const I64_CODE: u8 = 2;
const HIERARCHICAL_FACET_CODE: u8 = 3;
const BYTES_CODE: u8 = 4;
impl BinarySerializable for Value {
fn serialize<W: Write>(&self, writer: &mut W) -> io::Result<()> {
match *self {
Value::Str(ref text) => {
TEXT_CODE.serialize(writer)?;
text.serialize(writer)
}
Value::U64(ref val) => {
U64_CODE.serialize(writer)?;
val.serialize(writer)
}
Value::I64(ref val) => {
I64_CODE.serialize(writer)?;
val.serialize(writer)
}
Value::Facet(ref facet) => {
HIERARCHICAL_FACET_CODE.serialize(writer)?;
facet.serialize(writer)
}
Value::Bytes(ref bytes) => {
BYTES_CODE.serialize(writer)?;
bytes.serialize(writer)
}
}
}
fn deserialize<R: Read>(reader: &mut R) -> io::Result<Self> {
let type_code = u8::deserialize(reader)?;
match type_code {
TEXT_CODE => {
let text = String::deserialize(reader)?;
Ok(Value::Str(text))
}
U64_CODE => {
let value = u64::deserialize(reader)?;
Ok(Value::U64(value))
}
I64_CODE => {
let value = i64::deserialize(reader)?;
Ok(Value::I64(value))
}
HIERARCHICAL_FACET_CODE => Ok(Value::Facet(Facet::deserialize(reader)?)),
BYTES_CODE => Ok(Value::Bytes(Vec::<u8>::deserialize(reader)?)),
_ => Err(io::Error::new(
io::ErrorKind::InvalidData,
format!("No field type is associated with code {:?}", type_code),
)),
}
}
}
}
|
