actiondb 0.7.0

A safe and efficient unstructured text (log) parsing library.
Documentation 
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use super::TestMessage;
use serde;

impl serde::Deserialize for TestMessage {
    fn deserialize<D>(deserializer: &mut D) -> Result<TestMessage, D::Error>
        where D: serde::de::Deserializer
    {
        deserializer.deserialize_struct("TestMessage", &[], TestMessageVisitor)
    }
}

enum Field {
    MESSAGE,
    VALUES,
    TAGS,
}

impl serde::Deserialize for Field {
    fn deserialize<D>(deserializer: &mut D) -> Result<Field, D::Error>
        where D: serde::de::Deserializer
    {
        struct FieldVisitor;

        impl serde::de::Visitor for FieldVisitor {
            type Value = Field;

            fn visit_str<E>(&mut self, value: &str) -> Result<Field, E>
                where E: serde::de::Error
            {
                match value {
                    "message" => Ok(Field::MESSAGE),
                    "values" => Ok(Field::VALUES),
                    "tags" => Ok(Field::TAGS),
                    _ => Err(serde::de::Error::custom(format!("Unexpected field: {}", value))),
                }
            }
        }

        deserializer.deserialize(FieldVisitor)
    }
}


struct TestMessageVisitor;

impl serde::de::Visitor for TestMessageVisitor {
    type Value = TestMessage;

    fn visit_map<V>(&mut self, mut visitor: V) -> Result<TestMessage, V::Error>
        where V: serde::de::MapVisitor
    {
        let mut message = None;
        let mut values = None;
        let mut tags = None;

        while let Some(field) = try!(visitor.visit_key()) {
            match field {
                Field::MESSAGE => message = Some(try!(visitor.visit_value())),
                Field::VALUES => values = Some(try!(visitor.visit_value())),
                Field::TAGS => tags = Some(try!(visitor.visit_value())),
            }
        }

        let message_final = match message {
            Some(message) => message,
            None => try!(visitor.missing_field("message")),
        };

        let values = values.unwrap_or_default();

        try!(visitor.end());

        Ok(TestMessage::new(message_final, values, tags))
    }
}