camel-language-simple

Simple Language interpreter for rust-camel YAML DSL

Overview

camel-language-simple implements Apache Camel's Simple Language — a lightweight expression language for accessing exchange data and building predicates in route definitions.

Supported Expressions

Syntax	Description
`${header.name}`	Access a message header by name
`${body}`	Access the message body as text
`${exchangeProperty.name}`	Access an exchange property

Supported Operators

Operator	Example	Description
`==`	`${header.type} == 'order'`	Equality
`!=`	`${header.type} != null`	Inequality
`>`	`${header.age} > 18`	Greater than (numeric)
`<`	`${header.age} < 100`	Less than (numeric)
`>=`	`${header.count} >= 5`	Greater than or equal
`<=`	`${header.count} <= 10`	Less than or equal
`contains`	`${body} contains 'hello'`	String contains

Usage

use camel_language_simple::SimpleLanguage;
use camel_language_api::Language;

let lang = SimpleLanguage;

// Create a predicate
let pred = lang.create_predicate("${header.type} == 'order'").unwrap();

// Create an expression
let expr = lang.create_expression("${header.name}").unwrap();

Registration

SimpleLanguage is registered by default in CamelContext under the name "simple":

let ctx = CamelContext::new();
let lang = ctx.resolve_language("simple").unwrap();

License

Apache-2.0