我正在使用带有XBase语法的Xtext 在每个生成的java类中,我需要在模型inferer中初始化类变量。这个变量没有在我的模型中定义,但没有区别 我已经可以通过函数
生成这个变量了element.toField("isSomethingSet", newTypeRef("boolean"))
,但我无法初始化它。我确定我应该使用带有初始化程序的附加参数的 toField 函数,但因为它的类型为 Procedure1 我不知道如何用它。
这是我从Xtext文档中略微更改的示例。 语法:
grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.xbase.Xbase
generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"
Domainmodel:
(elements += AbstractElement)*;
AbstractElement:
Entity;
Entity:
'entity' name = ID ('extends' superType = JvmTypeReference)?
'{'
(features += Feature)*
'}';
Feature:
name = ID ':' type = JvmTypeReference;
ModelInferrer.xtend
import com.google.inject.Inject
import org.eclipse.xtext.naming.IQualifiedNameProvider
import org.eclipse.xtext.xbase.jvmmodel.AbstractModelInferrer
import org.eclipse.xtext.xbase.jvmmodel.IJvmDeclaredTypeAcceptor
import org.eclipse.xtext.xbase.jvmmodel.JvmTypesBuilder
import org.xtext.example.mydsl.myDsl.Entity
class MyDslJvmModelInferrer extends AbstractModelInferrer {
@Inject extension JvmTypesBuilder
@Inject extension IQualifiedNameProvider
def dispatch void infer(Entity element, IJvmDeclaredTypeAcceptor acceptor,
boolean isPrelinkingPhase) {
acceptor.accept(element.toClass(element.fullyQualifiedName)).initializeLater [
documentation = element.documentation
members += element.toField("isSomethingSet", newTypeRef("boolean"))
for (feature : element.features) {
members += feature.toField(feature.name, feature.type)
members += feature.toSetter(feature.name, feature.type)
members += feature.toGetter(feature.name, feature.type)
}
]
}
}
答案 0 :(得分:5)
该过程封装了配置字段所需的代码,例如:设置可见性,静态标志,文档或字段初始值设定项:
element.toField("isSomethingSet", newTypeRef("boolean")) [
initializer = '''false''' // with Xtext 2.5 or
initializer = [ append('false') ] // prior to 2.5
]