EMF Search---Developer Guide

Introduction

Developers have several levels/contexts/persitences configurations for which they want to use EMF Search.

One aspect is which modeling level they want their extension to address :

• meta modeling level
  • Ecore meta-modeling (M3)
  • UML2 meta-modeling or custom meta-models (M2)
  • Model instance (M1)

Another aspect is where and how their meta models are stored :

• meta model perstistence layer type
  • Eclipse Resources
  • Local File System
  • WWW distant resources (Close to be supported)
  • DB persitence (Support planned)

Depending on these particular situations, EMF Search typical usages exist.

Search Scope & Visitors

EMF Search defines a Scope API contract with IModelSearchScope :

    public interface IModelSearchScope<P, O> {
        List<P> getParticipants();
        void addParticipant(P resource);
        void addParticipants(P[] resources);
        void removeParticipant(P resource);
        void removeParticipants(P[] resources);
        List<P> findPartcipant(Class<O> clazz);
        String getLabel();
    }

• Eclipse Workspace resource

• Local File System

• Distant locations (Http URIs)

• EE repositories

Ecore Query & Helper

Ecore EMF Search comes with several helpers for query building & launching :

IModelSearchScope scope = ModelSearchWorkspaceScopeFactory.getInstance().createModelSearchWorkspaceScope("org.eclipse.emf.search.ecoreSearchEngine");
		query = EcoreTextualModelSearchQueryBuilderHelper.getInstance().buildGlobalTextualModelSearchQuery(regex, scope, EcorePackage.eNS_URI);
 
		query.run(new NullProgressMonitor());
 
		ISearchResult result = query.getModelSearchResult();
 
		if (result instanceof IModelSearchResult) {
                    // Help yourself with model result entry
		    Collection<IModelResultEntry> reultEntries = ((IModelSearchResult)result).getResultsFlatenned();
		}