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use std::fmt;
use std::ops::Deref;
use crate::message_dyn::MessageDyn;
use crate::reflect::dynamic::DynamicMessage;
use crate::reflect::reflect_eq::ReflectEq;
use crate::reflect::reflect_eq::ReflectEqMode;
use crate::reflect::MessageDescriptor;
use crate::MessageFull;
#[derive(Clone, Debug)]
enum MessageRefImpl<'a> {
Message(&'a dyn MessageDyn),
EmptyDynamic(DynamicMessage),
}
#[derive(Clone, Debug)]
pub struct MessageRef<'a> {
imp: MessageRefImpl<'a>,
}
impl<'a> fmt::Display for MessageRef<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(self.deref(), f)
}
}
impl<'a> From<&'a dyn MessageDyn> for MessageRef<'a> {
fn from(m: &'a dyn MessageDyn) -> Self {
MessageRef {
imp: MessageRefImpl::Message(m),
}
}
}
impl<'a, M: MessageFull> From<&'a M> for MessageRef<'a> {
fn from(m: &'a M) -> Self {
MessageRef {
imp: MessageRefImpl::Message(m),
}
}
}
impl<'a> ReflectEq for MessageRef<'a> {
fn reflect_eq(&self, that: &Self, mode: &ReflectEqMode) -> bool {
let ad = self.descriptor_dyn();
let bd = that.descriptor_dyn();
ad == bd && ad.reflect_eq(&**self, &**that, mode)
}
}
impl<'a> MessageRef<'a> {
pub fn new(message: &'a dyn MessageDyn) -> MessageRef<'a> {
MessageRef {
imp: MessageRefImpl::Message(message),
}
}
pub fn default_instance(message: &MessageDescriptor) -> MessageRef<'static> {
match message.default_instance() {
Some(m) => MessageRef::new(m),
None => MessageRef {
imp: MessageRefImpl::EmptyDynamic(DynamicMessage::new(message.clone())),
},
}
}
}
impl<'a> Deref for MessageRef<'a> {
type Target = dyn MessageDyn;
fn deref(&self) -> &dyn MessageDyn {
match &self.imp {
MessageRefImpl::Message(m) => *m,
MessageRefImpl::EmptyDynamic(e) => e,
}
}
}