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soheilhy/CakePatternIm.scala

Created June 20, 2012 01:25
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Cake Pattern Imitated
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CakePatternIm.scala
// You create the trait.
trait JavaScriptCompilerComponent {
def compiler: JavaScriptCompiler
trait JavaScriptCompiler {
def compile(files: Seq[Source]): String
}
}
// You implement it.
trait DummyJavaScriptParserComponent extends JavaScriptCompilerComponent {
override val compiler = new DummyJavaScriptCompiler
class DummyJavaScriptCompiler extends JavaScriptCompiler {
override def compile(files: Seq[Source]) = {
...
}
}
}
trait PageRenderer {
def render: Elem
}
// You add the dependecy.
class MyPageRenderer extends PageRenderer { this: JavaScriptCompilerComponent =>
val jsFiles = Source.fromFile("test.js") :: Nil
override def render =
<html>
<script>
{compiler.compile(jsFiles)}
</script>
</html>
}
// And you inject it.
val page = new MyPageRenderer with DummyJavaScriptParserComponent
...
page.render
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