Text File Parsing - Java Bean Instantiation with mwe2 (Xtext)

Question

I have text files to be parsed (i.e., convert to Java Bean Instances),

Formed the required XText grammar.

My XText Grammar:

grammar org.eclipse.xtext.example.Domainmodel with org.eclipse.xtext.common.Terminals

generate domainmodel "http://www.eclipse.org/xtext/example/Domainmodel"

Model:
    greetings+=Greeting*;

Greeting:
    'Hello' name =ID '!' ;

Able to generate the Greeting and Model Java Bean Classes, By running " Generate XText Artifacts " Generated Bean classes are given below

Greeting.java

package org.eclipse.xtext.example.domainmodel;

import org.eclipse.emf.ecore.EObject;

public interface Greeting extends EObject
{
  String getName();
  void setName(String value);

}

Model.java

package org.eclipse.xtext.example.domainmodel;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.ecore.EObject;

public interface Model extends EObject
{
  EList<Greeting> getGreetings();
}

GenerateDomainmodel.mwe2 generated.

Able to generate Resource using the .genmodel, as given in the below Main (Partial) class

package org.eclipse.xtext.example;

import java.io.File;
import java.util.List;
import java.util.Map;

import javax.tools.Diagnostic;

import org.eclipse.emf.codegen.ecore.genmodel.GenModel;
import org.eclipse.emf.codegen.ecore.genmodel.GenModelPackage;
import org.eclipse.emf.codegen.ecore.genmodel.GenPackage;
import org.eclipse.emf.codegen.ecore.genmodel.impl.GenModelImpl;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.common.util.TreeIterator;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.util.Diagnostician;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.ecore.xmi.impl.EcoreResourceFactoryImpl;
import org.eclipse.emf.ecore.xmi.impl.XMIResourceFactoryImpl;
import org.eclipse.emf.ecore.xmi.impl.XMLResourceFactoryImpl;
import org.eclipse.emf.mwe2.language.mwe2.Mwe2Package;
import org.eclipse.emf.mwe2.runtime.workflow.IWorkflow;
import org.eclipse.xtext.AbstractElement;
import org.eclipse.xtext.example.domainmodel.DomainmodelFactory;
import org.eclipse.xtext.example.domainmodel.Greeting;
import org.eclipse.xtext.example.domainmodel.Model;
import org.eclipse.xtext.example.domainmodel.impl.DomainmodelFactoryImpl;
import org.eclipse.xtext.example.domainmodel.impl.DomainmodelPackageImpl;
import org.eclipse.xtext.example.domainmodel.impl.GreetingImpl;

public class Main {

    public static void main(String args[]){

        new DomainmodelStandaloneSetup().createInjectorAndDoEMFRegistration();
        ResourceSet rs = new ResourceSetImpl();
        rs.getResourceFactoryRegistry().getExtensionToFactoryMap().put("genmodel", new XMIResourceFactoryImpl());

        EPackage.Registry.INSTANCE.put(GenModelPackage.eNS_URI, GenModelPackage.eINSTANCE);

        File f = new File("/data/TASKS/4. 2016-2017_PS1/XTEXT/ECLIPSE WORKSPACE 1/org.eclipse.xtext.example.domainmodel/model/generated/Domainmodel.genmodel");
        System.out.println(f.canRead());
        Resource resource = rs.getResource(URI.createURI(f.toURI().toString()), true);
    }
}

Having done all this, How to generate the Greeting class instances using the below text input file.

Hello Ramasamy !
Hello Govinda Govinda !
Hello Kuppusamy !
Hello Karuppusamy !

I am in need of Model Instance, which contains 4 No. of Greeting Instances with the following values as a name.

1. Greeting instance1 -> name ( " Ramasamy " )
2. Greeting instance1 -> name ( " Govinda Govinda " )
3. Greeting instance1 -> name ( " Kuppusamy " )
4. Greeting instance1 -> name ( " Karuppusamy " )

My Main program has to generate the Greeting instances using the above text input file, Can somebody help me out on this

Or is there any other way to achieve?

Answer 1

Here is a sample for such a main

import java.io.IOException;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.xtext.example.mydsl.myDsl.Greeting;
import org.xtext.example.mydsl.myDsl.Model;

import com.google.inject.Injector;

public class Main {

    public static void main(String[] args) throws IOException {
        Injector i = new MyDslStandaloneSetup().createInjectorAndDoEMFRegistration();
        ResourceSet rs = i.getInstance(ResourceSet.class);
        Resource r = rs.getResource(URI.createFileURI("./test.mydsl"), true);
        r.load(null);
        Model m = (Model) r.getContents().get(0);
        for (Greeting g : m.getGreetings()) {
            System.out.println(g.getName());
        }
    }

}

updated to your code it would look like

import java.io.IOException;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.xtext.example.DomainmodelStandaloneSetup;
import org.eclipse.xtext.example.domainmodel.Greeting;
import org.eclipse.xtext.example.domainmodel.Model;

import com.google.inject.Injector;

public class Main {

    public static void main(String[] args) throws IOException {
        Injector i = new DomainmodelStandaloneSetup().createInjectorAndDoEMFRegistration();
        ResourceSet rs = i.getInstance(ResourceSet.class);
        Resource r = rs.getResource(URI.createFileURI("./src/mydsl.dmodel"), true);
        r.load(null);
        Model m = (Model) r.getContents().get(0);
        for (Greeting g : m.getGreetings()) {
            System.out.println(g.getNamee());
        }
    }

}