Tutorial

The following is based on the EMF model created in EMF Tutorial which we are going to persists. Create a new plugin project "de.vogella.emf.webpage.instance". Add the following dependency to your "plugin.xml".

				
package writeWebpage;

import java.io.IOException;
import java.util.Collections;
import java.util.Map;

import org.eclipse.emf.common.util.URI;
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.xmi.impl.XMIResourceFactoryImpl;

import datamodel.website.MyWeb;
import datamodel.website.Webpage;
import datamodel.website.WebsiteFactory;
import datamodel.website.WebsitePackage;
import datamodel.website.impl.WebsitePackageImpl;

public class CreateSaveTester {

	
/**
	 * @param args
	 */
	public static void main(String[] args) {
		// Initialize the model
		WebsitePackage.eINSTANCE.eClass();
		// Retrieve the default factory singleton
		WebsiteFactory factory = WebsiteFactory.eINSTANCE;

		// Create the content of the model via this program
		MyWeb myWeb = factory.createMyWeb();
		Webpage page = factory.createWebpage();
		page.setName("index");
		page.setDescription("Main webpage");
		page.setKeywords("Eclipse, EMF");
		page.setTitle("Eclipse EMF");
		myWeb.getPages().add(page);

		// As of here we preparing to save the model content

		// Register the XMI resource factory for the .website extension

		Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
		Map<String, Object> m = reg.getExtensionToFactoryMap();
		m.put("website", new XMIResourceFactoryImpl());

		// Obtain a new resource set
		ResourceSet resSet = new ResourceSetImpl();

		// Create a resource
		Resource resource = resSet.createResource(URI
				.createURI("website/My2.website"));
		// Get the first model element and cast it to the right type, in my
		// example everything is hierarchical included in this first node
		resource.getContents().add(myWeb);

		// Now save the content.
		try {
			resource.save(Collections.EMPTY_MAP);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

			

The following coding can be used to load an existing model.

				

package writeWebpage;

import java.util.Map;

import org.eclipse.emf.common.util.URI;
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.xmi.impl.XMIResourceFactoryImpl;

import datamodel.website.MyWeb;
import datamodel.website.WebsitePackage;
import datamodel.website.impl.WebsitePackageImpl;

public class EMFModelLoad {
	public MyWeb load() {
		// Initialize the model
		WebsitePackage.eINSTANCE.eClass();
		
		// Register the XMI resource factory for the .website extension

		Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
		Map<String, Object> m = reg.getExtensionToFactoryMap();
		m.put("website", new XMIResourceFactoryImpl());

		// Obtain a new resource set
		ResourceSet resSet = new ResourceSetImpl();

		// Get the resource
		Resource resource = resSet.getResource(URI
				.createURI("website/My.website"), true);
		// Get the first model element and cast it to the right type, in my
		// example everything is hierarchical included in this first node
		MyWeb myWeb = (MyWeb) resource.getContents().get(0);
		return myWeb;
	}

}

			

You can then access the model content via standard Java coding.

				
package writeWebpage;

import java.util.Iterator;

import datamodel.website.MyWeb;
import datamodel.website.Webpage;

public class LoadTest {

	
/**
	 * @param args
	 */
	public static void main(String[] args) {
		// Loading the existing model
		EMFModelLoad loader = new EMFModelLoad();
		MyWeb myWeb = loader.load();
		// Accessing the model information
		System.out.println(myWeb.getDescription());
		System.out.println(myWeb.getTitle());
		// Lets see what info the webpage has
		for (Iterator<Webpage> iterator = myWeb.getPages().iterator(); iterator
				.hasNext();) {
			Webpage page = iterator.next();
			System.out.println("Name : " + page.getName());
			// We could also iterate over the Articles...
		}
	}
}

			

Source Code of Examples

http://www.eclipse.org/modeling/emf Eclipse EMF Homepage

http://www.eclipse.org/modeling/emf/docs/ EMF Documentation

http://www.ibm.com/developerworks/opensource/library/os-ecemf1 Model with the Eclipse Modeling Framework, Part 1: Create UML models and generate code

http://www.ibm.com/developerworks/opensource/library/os-ecemf2 Model with the Eclipse Modeling Framework, Part 2: Generate code with Eclipse's Java Emitter Templates

http://www.eclipse.org/m2m/atl/ ATL allows model to model transformation for EMF

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