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|
use std::fmt;
use serde::{Serialize, Serializer, Deserialize, Deserializer};
use serde::de::Visitor;
/// 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),
}
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),
}
}
}
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())
}
}
mod binary_serialize {
use common::BinarySerializable;
use std::io::{self, Read, Write};
use super::Value;
const TEXT_CODE: u8 = 0;
const U64_CODE: u8 = 1;
const I64_CODE: u8 = 2;
impl BinarySerializable for Value {
fn serialize(&self, writer: &mut Write) -> io::Result<usize> {
let mut written_size = 0;
match *self {
Value::Str(ref text) => {
written_size += try!(TEXT_CODE.serialize(writer));
written_size += try!(text.serialize(writer));
}
Value::U64(ref val) => {
written_size += try!(U64_CODE.serialize(writer));
written_size += try!(val.serialize(writer));
}
Value::I64(ref val) => {
written_size += try!(I64_CODE.serialize(writer));
written_size += try!(val.serialize(writer));
}
}
Ok(written_size)
}
fn deserialize(reader: &mut Read) -> io::Result<Self> {
let type_code = try!(u8::deserialize(reader));
match type_code {
TEXT_CODE => {
let text = try!(String::deserialize(reader));
Ok(Value::Str(text))
}
U64_CODE => {
let value = try!(u64::deserialize(reader));
Ok(Value::U64(value))
}
I64_CODE => {
let value = try!(i64::deserialize(reader));
Ok(Value::I64(value))
}
_ => {
Err(io::Error::new(io::ErrorKind::InvalidData,
format!("No field type is associated with code {:?}",
type_code)))
}
}
}
}
}
|
