如何用Java代码生成EMF模型
我想用Java代码生成EMF模型。例如,我想创建一个新的Ecore建模项目,并构建一个简单的模型,如许多教程中所示(如)。但是我不想用GUI手工完成。我想学习如何使用Java代码创建模型 我试图找到关于这个主题的教程。但令我失望的是,我找不到太多关于这个话题的信息。我只能找到一些。但是没有关于创建新模型的内容。只是浏览API对我没有帮助 关于这个话题有什么消息来源吗?如果没有,我如何通过java代码创建EMF模型?有一个关于动态EMF的主题 但如果您熟悉emf中的创建工作方式,那么这是非常直接的。每个EPackage都有自己的如何用Java代码生成EMF模型,java,eclipse,eclipse-emf,eclipse-emf-ecore,Java,Eclipse,Eclipse Emf,Eclipse Emf Ecore,我想用Java代码生成EMF模型。例如,我想创建一个新的Ecore建模项目,并构建一个简单的模型,如许多教程中所示(如)。但是我不想用GUI手工完成。我想学习如何使用Java代码创建模型 我试图找到关于这个主题的教程。但令我失望的是,我找不到太多关于这个话题的信息。我只能找到一些。但是没有关于创建新模型的内容。只是浏览API对我没有帮助 关于这个话题有什么消息来源吗?如果没有,我如何通过java代码创建EMF模型?有一个关于动态EMF的主题 但如果您熟悉emf中的创建工作方式,那么这是非常直接的
EFactory
和EPackage
实例,它们处理创建(工厂)或存储有关元模型本身的信息(EPackage)
Ecore拥有自己的EPackage
和EFactory
,因此完全可以像这样动态创建新的元模型:
/*Use the Ecore factory*/
EcoreFactory ecoreFactory = EcoreFactory.eINSTANCE;
/*Create your EPackage*/
EPackage myPackage = ecoreFactory.createEPackage();
/*set EPackage properties*/
myPackage.setName("myTest");
myPackage.setNsPrefix("myTest");
myPackage.setNsURI("http://com.myTest");
/*Create your first EClass*/
EClass myFirstEClass = ecoreFactory.createEClass();
myFirstEClass.setName("myClass");
/*Add to your EPackage's EClassifiers*/
/*EClasses and EDatatypes implement both EClassifiers*/
myPackage.getEClassifiers().add(myFirstEClass);
/*Create your first EAtttribute*/
EAttribute myFirstEAtt = ecoreFactory.createEAttribute();
myFirstEAtt.setName("name");
/*Use the EcorePackage Datatypes -> here EString*/
myFirstEAtt.setEType(EcorePackage.eINSTANCE.getEString());
/*use EStructuralFeatures to add your EAtt*/
/*EReferences and EAttributes are both EStructuralfeatures*/
myFirstEClass.getEStructuralFeatures().add(myFirstEAtt);
/*
* Save your EPackage to file ecore file:
*/
/*Initialize your EPackage*/
myPackage.eClass();
Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
Map<String, Object> m = reg.getExtensionToFactoryMap();
/*add default .ecore extension for ecore file*/
m.put(EcorePackage.eNAME, new XMIResourceFactoryImpl());
// Obtain a new resource set
ResourceSet resSet = new ResourceSetImpl();
// create a resource
Resource resource = null;
try {
resource = resSet.createResource(URI.createFileURI("/Your/Path/To/Directory/myTest.ecore"));
} catch (Exception e) {
e.printStackTrace();
}
/*add your EPackage as root, everything is hierarchical included in this first node*/
resource.getContents().add(myPackage);
// now save the content.
try {
resource.save(Collections.EMPTY_MAP);
} catch (IOException e) {
e.printStackTrace();
}
更新:
/*Create your second EClass*/
EClass mySecondEClass = ecoreFactory.createEClass();
mySecondEClass.setName("mySecondClass");
myPackage.getEClassifiers().add(mySecondEClass);
/*now, the firstClass should hold instances of secondClass*/
/*1. create EReference (Ereferences unlike EAttributes define relationships between EClasses)*/
EReference secondClassesRef = ecoreFactory.createEReference();
secondClassesRef.setName("secondClasses");
/*set containment true -> every EObject must have a Container*/
secondClassesRef.setContainment(true);
/*set Type to your EClass*/
secondClassesRef.setEType(mySecondEClass);
/*set upperbound -> now the reference is an EList*/
secondClassesRef.setUpperBound(ETypedElement.UNBOUNDED_MULTIPLICITY);
/*finally add ERef to EClass*/
myFirstEClass.getEStructuralFeatures().add(secondClassesRef);
/*and for example supertypes*/
myFirstEClass.getESuperTypes().add(mySecondEClass);
现在,您有了自己的EPackage
,带有一个新的EClass
,其中包含EAttribute
类型的名称EString
现在还可以将新的EPackage保存到.ecore
文件中,如下所示:
/*Use the Ecore factory*/
EcoreFactory ecoreFactory = EcoreFactory.eINSTANCE;
/*Create your EPackage*/
EPackage myPackage = ecoreFactory.createEPackage();
/*set EPackage properties*/
myPackage.setName("myTest");
myPackage.setNsPrefix("myTest");
myPackage.setNsURI("http://com.myTest");
/*Create your first EClass*/
EClass myFirstEClass = ecoreFactory.createEClass();
myFirstEClass.setName("myClass");
/*Add to your EPackage's EClassifiers*/
/*EClasses and EDatatypes implement both EClassifiers*/
myPackage.getEClassifiers().add(myFirstEClass);
/*Create your first EAtttribute*/
EAttribute myFirstEAtt = ecoreFactory.createEAttribute();
myFirstEAtt.setName("name");
/*Use the EcorePackage Datatypes -> here EString*/
myFirstEAtt.setEType(EcorePackage.eINSTANCE.getEString());
/*use EStructuralFeatures to add your EAtt*/
/*EReferences and EAttributes are both EStructuralfeatures*/
myFirstEClass.getEStructuralFeatures().add(myFirstEAtt);
/*
* Save your EPackage to file ecore file:
*/
/*Initialize your EPackage*/
myPackage.eClass();
Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
Map<String, Object> m = reg.getExtensionToFactoryMap();
/*add default .ecore extension for ecore file*/
m.put(EcorePackage.eNAME, new XMIResourceFactoryImpl());
// Obtain a new resource set
ResourceSet resSet = new ResourceSetImpl();
// create a resource
Resource resource = null;
try {
resource = resSet.createResource(URI.createFileURI("/Your/Path/To/Directory/myTest.ecore"));
} catch (Exception e) {
e.printStackTrace();
}
/*add your EPackage as root, everything is hierarchical included in this first node*/
resource.getContents().add(myPackage);
// now save the content.
try {
resource.save(Collections.EMPTY_MAP);
} catch (IOException e) {
e.printStackTrace();
}
/*
*将EPackage保存到文件ecore文件:
*/
/*初始化您的EPackage*/
myPackage.eClass();
Resource.Factory.Registry reg=Resource.Factory.Registry.INSTANCE;
Map m=reg.getExtensionFactoryMap();
/*为ecore文件添加default.ecore扩展名*/
m、 put(EcorePackage.eNAME,新的XMIResourceFactoryImpl());
//获取新的资源集
ResourceSet RESET=新的ResourceSetImpl();
//创建资源
Resource=null;
试一试{
resource=reset.createResource(URI.createFileURI(“/Your/Path/To/Directory/myTest.ecore”);
}捕获(例外e){
e、 printStackTrace();
}
/*将您的EPackage添加为root,所有内容都包含在第一个节点中*/
resource.getContents().add(myPackage);
//现在保存内容。
试一试{
resource.save(Collections.EMPTY_MAP);
}捕获(IOE异常){
e、 printStackTrace();
}
反之亦然,如果要加载现有ecore EPackage:
/*
* load existing EPackage
*/
EcorePackage.eINSTANCE.eClass();
/*Initialize your EPackage*/
final Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
final Map<String, Object> m = reg.getExtensionToFactoryMap();
m.put(EcorePackage.eNAME, new XMIResourceFactoryImpl());
final ResourceSet resSet = new ResourceSetImpl();
Resource resource = null;
try {
resource = resSet.getResource(URI.createFileURI("/Your/Path/To/Directory/myTest.ecore"), true);
} catch (Exception e) {
e.printStackTrace();
}
/*load root and cast to EPackage*/
final EPackage root = (EPackage) resource.getContents().get(0);
/*
*加载现有EPackage
*/
EcorePackage.eINSTANCE.eClass();
/*初始化您的EPackage*/
final Resource.Factory.Registry reg=Resource.Factory.Registry.INSTANCE;
最终映射m=reg.getExtensionFactoryMap();
m、 put(EcorePackage.eNAME,新的XMIResourceFactoryImpl());
final ResourceSet RESET=新的ResourceSetImpl();
Resource=null;
试一试{
resource=reset.getResource(URI.createFileURI(“/Your/Path/To/Directory/myTest.ecore”),true);
}捕获(例外e){
e、 printStackTrace();
}
/*将根部和铸件装入EPackage*/
最终EPackage根=(EPackage)resource.getContents().get(0);
更新:
Ecore当然有自己的元模型。在中,您可以看到ecore体系结构的一个很好的概述
因此,如果您想使用动态EMF,您需要了解这一点。正如我向您展示的,动态创建EPackage
非常简单,但是您需要知道如何设置ecore模型的基本属性(EClass、EAttributes、erereference、EType、containment、supertypes…)。一旦理解了体系结构,就很容易了。看看页面底部的UML图
我还更新了上面的代码,向您展示了如何初始化EClasses之间的关系谢谢您的帮助,但我还有一个问题:如何在两个类之间创建关系?像普通引用还是超类型关系?更新了我的答案