davsclaus opened a new pull request, #24031:
URL: https://github.com/apache/camel/pull/24031
## Summary
- Add a new `core/camel-java-io` module that generates fluent Java DSL
source code from Camel model definitions
- Enables full-circle DSL transformation: XML/YAML → Model → Java DSL (and
back via existing parsers)
- Follows the same code-generation pattern as existing `camel-xml-io` and
`camel-yaml-io` modules
## Architecture
| Layer | XML | YAML | **Java DSL (new)** |
|-------|-----|------|-------------------|
| Module | `core/camel-xml-io` | `core/camel-yaml-io` | `core/camel-java-io`
|
| Generated class | `ModelWriter` | `YamlModelWriter` | `JavaDslModelWriter`
|
| Support class | `BaseWriter` | `YamlModelWriterSupport` |
`JavaDslModelWriterSupport` |
| Package | `o.a.c.xml.out` | `o.a.c.yaml.out` | `o.a.c.java.out` |
| Mojo | `XmlModelWriterGeneratorMojo` | `YamlModelWriterGeneratorMojo` |
`JavaDslModelWriterGeneratorMojo` |
| Template | `model-writer.vm` | `model-yaml-writer.vm` |
`model-java-dsl-writer.vm` |
## Example Output
```java
from("direct:start")
.routeId("myRoute")
.choice()
.when(simple("${header.type} == 'a'"))
.to("mock:a")
.when(simple("${header.type} == 'b'"))
.to("mock:b")
.otherwise()
.to("mock:other")
.end()
.to("mock:result");
```
## New Files
- `JavaDslModelWriterGeneratorMojo.java` — Mojo extending
`ModelWriterGeneratorMojo` for code generation
- `model-java-dsl-writer.vm` — Velocity template producing the generated
`JavaDslModelWriter` class
- `core/camel-java-io/` — New module with `JavaDslModelWriterSupport` (DSL
rendering helpers) and generated `JavaDslModelWriter`
- Test suite covering simple routes, choice/when/otherwise, filter, split,
setHeader, setVariable, transform, wireTap, multicast, toD, removeHeader,
multiple expression languages, and writer reusability
## Test Plan
- [x] Unit tests for all major EIP patterns (12 tests)
- [x] Expected output files for exact string comparison
- [x] Writer reusability test (same instance, multiple routes)
- [x] Full root build passes (`mvn clean install -DskipTests`)
_Claude Code on behalf of Claus Ibsen_
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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