xiaoma20082008 opened a new pull request #25:
URL: https://github.com/apache/velocity-engine/pull/25
I want to refactor the velocity with a more scalable API (for Users) and SPI
(for Developers), but I don't know whether it's needed, So I created this pr
for ensure it (Please tell me if you need otherwise please close this pr, Thank
you! ).
The target is:
1. compile the template(*.vm) to a java class(*.java), also provide a
interpreter like now.
2. the template#render will compile the generated java code to a java class
and execute it.
The sample usage For User:
```java
Template template = VelocityEngine.getTemplate(name, locale, encoding);
template.render(context, writer);
```
Sample Implementation is:
```java
Template getTemplate(String name, Locale locale, String encoding) {
// 0. cache
Resource r = cache.get(name);
// 1. load (the loader maybe is ClasspathLoader, FileLoader, JarLoader... )
r = loader.load(name, locale, encoding);
// 2. read a .vm file to string with encoding
String source = r.getSource();
// 3. convert xxs characters
source = converter.convert(name, source);
// 4. compile
Class<?> templateClass = compiler.compile(source); // maybe a
CompiledTemplate or a InterpretedTemplate
// 5. create template instance
return templateClass.getConstructor().newInstance();
}
```
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