Eclipse Modeling Framework

Eclipse Modeling Frameworkajaykemparaj@gmail.comhttp://www.theenmusketeers.comEMF

What is Eclipse ?Eclipse is a Java IDEEclipse is an IDE FrameworkEclipse + JDT = Java IDEFirst class framework for JavaLanguage aware editorIncremental buildIntegrated debuggingEclipse + CDT = C/C++ IDEFirst class framework for C/C++Language aware editorRefactoring, searchEclipse + PHP = PHP IDEEclipse + JDT + CDT + PHP = Java, C/C++, PHP IDE………….

Plug-inPlug-inPlug-inEclipse is a Tools FrameworkTools extend the Eclipse platform using plug-insBusiness Intelligence and Reporting Tools (BIRT)Eclipse Communications Framework (ECF)Web Tools Project (WTP)Eclipse Modelling Framework (EMF)Graphical Editing Framework (GEF)Test and Performance Tooling Project (TPTP

Eclipse is a Application FrameworkRemove the IDE elements, Java language support, team development support, … and you’re left with a pretty comprehensive general application frameworkSupport for multiple platformsLinux, Windows, Mac OSX, UNIX, embeddedRich widget set, graphicsNative-OS integration (drag and drop, OLE/XPCOM integration)A platform for rich clients

Eclipse is all these thingsA Java IDEAn IDE FrameworkA Tools FrameworkAn Application FrameworkAn Open Source EnablerA communityAn eco-systemA foundation

Model Driven Architecture (MDA)• A software architecture proposed by the OMG (Object Management Group)• Application specified in high-level, Platform Independent Model (PIM)• Transformation technologies used to convert PIM toPlatform Specific Model (PSM), implementation code• Includes several open modeling standards: UML™ (Unified Modeling Language) MOF (Meta-Object Facility) XMI (XML Metadata Interchange) CWM (Common Warehouse Model)

What is EMF ?EMF is a simple, pragmatic approach to modeling: Allows us to generate some of the code that we write over and over, paving the way for more complex systems Models are simple, but meant to be mixed with hand-written code It’s real, proven technology (since 2002)

What EMF is ?A Model for describing other Model (Meta Model)

Runtime Emulator for your model

generator for Java Implementation of your ModelEMF is a framework converting various forms of model into core model description called Ecore

Why EMF ?EMF is middle ground in the modeling vs. programming worldsFocus is on class diagram subset of UML modeling (object model)Transforms models into Java codeProvides the infrastructure to use models effectively in your applicationVery low cost of entry EMF is free and open sourceFull scale graphical modeling tool not requiredReuses your knowledge of UML, XML Schema, or JavaIt’s real, proven technology (since 2002)

Some of Eclipse projects which are using EMFTools Project: UML2 and Visual Editor (VE)

Web Tools Platform (WTP) Project

Test and Performance Tools Platform (TPTP) Project

Business Intelligence and Reporting Tools (BIRT) Project

Data Tools Platform (DTP) Project

Modeling : Graphical Modeling Framework (GMF)What is an EMF “Model”?• Specification of an application’s data Object attributes Relationships (associations) between objects Operations available on each object Simple constraints (e.g. multiplicity) on objects and relationships• Essentially, the Class Diagram subset of UML

EMF Components• Core Runtime Notification framework Ecore meta model Persistence (XML/XMI), validation, change model• EMF.Edit Support for model-based editors and viewers Default reflective editor• Codegen Code generator for application models and editors Extensible model importer/exporter framework

The Ecore(Meta) Model• EMF’s metamodel (model of a model)

Model Sources• EMF models can be defined in (at least) three ways:1. Java Interfaces2. UML Class Diagram3. XML Schema

Java Interfacespublic interface Item{ String getProductName(); void setProductName(String value);intgetQuantity(); void setQuantity(int value) float getPrice(); void setPrice(float value);}public interface PurchaseOrder{ String getShipTo(); void setShipTo(String value); String getBillTo(); void setBillTo(String value); List getItems(); // List of Item}• Classes can be defined completely by a subset of members, supplemented by annotations

UML Class Diagram• Built-in support for Rational Rose®• UML2 support available with UML2 (from MDT)

XML Schema<?xml version="1.0" encoding="UTF-8"?><xsd:schemaxmlns:xsd="http://www.w3.org/2001/XMLSchema"targetNamespace="http://www.example.com/SimplePO"xmlns:po="http://www.example.com/SimplePO"><xsd:complexType name="PurchaseOrder"><xsd:sequence><xsd:element name="shipTo" type="xsd:string"/><xsd:element name="billTo" type="xsd:string"/><xsd:element name="items" type=“po:Item"minOccurs="0" maxOccurs="unbounded"/></xsd:sequence></xsd:complexType><xsd:complexType name="Item"><xsd:sequence><xsd:element name="productName" type="xsd:string"/><xsd:element name="quantity" type="xsd:int"/><xsd:element name="price" type="xsd:float"/></xsd:sequence></xsd:complexType></xsd:schema>

Direct Ecore Modeling• Ecore models can be created directly Sample Ecore editor (in EMF) Ecore Tools graphical editor (from EMFT)

Generated Model Code• Interface and implementation for each modeled class Includes get/set accessors for attributes and referencesInterfacepublic interface PurchaseOrder extends EObject{String getShipTo();void setShipTo(String value);String getBillTo();void setBillTo(String value);EList<Item> getItems();}Implementation Classpublic class PurchaseOrderImpl extends EObjectImplimplements PurchaseOrder{...}

Change Notification• Every EObject is also a notifier Sends notification whenever an attributeor reference is changed Observers can update views, dependentobjects Observers are also adaptersAdapterAdapter adapter = ...purchaseOrder.eAdapters().add(adapter);

Factories and Packages• Factory to create instances of model classes• Package provides access to metadataPOFactory factory = POFactory.eINSTANCE;PurchaseOrder order = factory.createPurchaseOrder();POPackagepoPackage = POPackage.eINSTANCE;EClassitemClass = POPackage.Literals.ITEM;//or poPackage.getItem()EAttributepriceAttr = POPackage.Literals.ITEM__PRICE;//or poPackage.getItem_Price()//or itemClass.getEStructuralFeature(POPackage.ITEM__PRICE)

Persistence• Persisted data is referred to a resource• Objects can be spread out among a number ofresources, within a resource set• Proxies represent referenced objects in otherresources

Resource Set• Context for multiple resources that may have references among them• Usually just an instance of ResourceSetImpl• Provides factory method for creating new resources in the setResourceSetrs = new ResourceSetImpl();URI uri = URI.createFileURI("C:/data/po.xml");Resource resource = rs.createResource(uri);• Also provides access to the registries, URI converterand default load options for the set

Resource• Container for objects that are to be persisted together Convert to and from persistent form via save() and load()

Access contents of resource via getContents()URI uri = URI.createFileURI("C:/data/po.xml");Resource resource = rs.createResource(uri);resource.getContents().add(p1);resource.save(null);• EMF provides generic XMLResource implementation Other, customized implementations.<PurchaseOrder><shipTo>John Doe</shipTo><next>p2.xml#p2</next></PurchaseOrder>

Registries• Resource Factory Registry Returns a resource factory for a given type of resource

Based on URI scheme, filename extension or content type

Determines the format for save/load

If no registered resource factory found locally, delegates to global registry: Resource.Factory.Registry.INSTANCE• Package Registry Returns the package identified by a given namespace URI

Eclipse Modeling Framework

More Related Content

Viewers also liked

Similar to Eclipse Modeling Framework

Recently uploaded

In this document

Eclipse Modeling Framework