Xtext＆Xtend - 向RequestMapping添加更多參數

Question

我一直在嘗試生成如下的Java彈簧代碼。

@RequestMapping(method=RequestMethod.DELETE, value="/message/{id}") 
public void reject(@PathVariable final Long id) { 
    return; 
} 

我在xtend文件中提供了下面的代碼。

members += event.toMethod(event.action.name, typeRef(void)) [ 
    var dataType = map.get(method.action.name) 
    parameters += event.toParameter(method.type.parameter.name, dataType.javaType) => [ 
     annotations += annotationRef("org.springframework.web.bind.annotation.PathVariable"); 
    ] 
    annotations += annotationRef("org.springframework.web.bind.annotation.RequestMapping", "method=RequestMethod.DELETE", "/message/{id}"); 
    body = ''' 
     return; 
    ''' 
] 

和我得到的輸出是

@RequestMapping({ "method=RequestMethod.DELETE", "/message/{id}" }) 
public void reject(@PathVariable final Long id) { 
    return; 
} 

我很困惑如何提供XTEND代碼，使我能得到RequestMapping格式@RequestMapping(method=RequestMethod.DELETE, value="/message/{id}")

Answer 1

的API有沒有方便那個用例，所以你必須自己動手

package org.eclipse.xtext.example.domainmodel.jvmmodel

import com.google.inject.Inject 
import org.eclipse.emf.ecore.EObject 
import org.eclipse.xtext.common.types.JvmAnnotationReference 
import org.eclipse.xtext.common.types.JvmAnnotationType 
import org.eclipse.xtext.common.types.JvmType 
import org.eclipse.xtext.common.types.TypesFactory 
import org.eclipse.xtext.common.types.util.TypeReferences 
import org.eclipse.xtext.example.domainmodel.domainmodel.Entity 
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.JvmAnnotationReferenceBuilder 
import org.eclipse.xtext.xbase.jvmmodel.JvmTypesBuilder 
import org.eclipse.xtext.common.types.JvmStringAnnotationValue 

class DomainmodelJvmModelInferrer extends AbstractModelInferrer { 

    @Inject extension JvmTypesBuilder 
    @Inject extension IQualifiedNameProvider 

    def dispatch infer(Entity entity, extension IJvmDeclaredTypeAcceptor acceptor, boolean prelinkingPhase) { 
     accept(entity.toClass(entity.fullyQualifiedName)) [ 
      documentation = entity.documentation 
      members += entity.toMethod("demo", Void.TYPE.typeRef) [ 
       annotations += 
        entity.toAnnotationRef("org.eclipse.xtext.example.domainmodel.lib.Demo", "a" -> "Hallo", 
         "b" -> "Welt", "c" -> "!") 
       body = '''''' 
      ] 
     ] 
    } 

    @Inject 
    private TypesFactory typesFactory; 

    @Inject 
    private TypeReferences references; 

    def toAnnotationRef(EObject context, String annotationTypeName, Pair<String, String> ... values) { 
     val JvmAnnotationReference result = typesFactory.createJvmAnnotationReference(); 
     val JvmType jvmType = references.findDeclaredType(annotationTypeName, context); 
     if (jvmType == null) { 
      throw new IllegalArgumentException("The type " + annotationTypeName + " is not on the classpath."); 
     } 
     if (!(jvmType instanceof JvmAnnotationType)) { 
      throw new IllegalArgumentException("The given class " + annotationTypeName + " is not an annotation type."); 
     } 
     val jvmAnnotationType = jvmType as JvmAnnotationType 

     result.setAnnotation(jvmAnnotationType); 
     for (value : values) { 
      val JvmStringAnnotationValue annoValue = typesFactory.createJvmStringAnnotationValue 
      annoValue.values += value.value 
      annoValue.operation = jvmAnnotationType.declaredOperations.findFirst[simpleName == value.key] 
      result.explicitValues.add(annoValue) 
     } 
     return result 

    } 

}