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Difference between revisions of "MoDisco/Components/FacetManager/Documentation/0.8"

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{{MoDiscoFacetManagerTabs}}
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#REDIRECT [[MoDisco/Moved To Help Center]]
 
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==How to create a model facet set==
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The first step is to [[MoDisco/ProjectNature|create
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a MoDisco project]].
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The second step is to [[MoDisco/QueryManager|create
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a query set]]. This query set will store boolean queries indicating if an
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object conforms to a facet.
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Right-click on the MoDisco project and select the "New > Other
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..." button.
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[[Image:MoDisco_Role_newRoleSet_001.gif]]
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Select "Facet Model" and press the "Next" button
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[[Image:MoDisco_Role_newRoleSet_002.gif]]
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Choose a name for your model facet set (My.facetSet in the example)
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and press "Next".
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[[Image:MoDisco_Role_newRoleSet_003.gif]]
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Select "FacetSet" in the "Model Object" list and press "Finish"
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[[Image:MoDisco_Role_newRoleSet_004.gif]]
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[[Image:MoDisco_Role_newRoleSet_005.gif]]
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Open the "My.facetSet" file and open the "Properties View"
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[[Image:MoDisco_Role_newRoleSet_006.gif]]
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Set the name of the facet set and make sure that the facet set name
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is the same as the containing file name ("My" in the example). The
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nsURI and prefix must also be filled.
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[[Image:MoDisco_Role_newRoleSet_007.gif]]
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Load the resources containing the meta-model extended by the
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facet set. To load a meta-model resource the user must use the "Load
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meta-model resource" action.
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[[Image:MoDisco_Role_newRoleSet_008.gif]]
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In this example, we choose to use the Java meta-model.
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[[Image:MoDisco_Role_newRoleSet_009.gif]]
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Fill the "Extended package" field with the ePackages
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containing the virtually extended meta-model.
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[[Image:MoDisco_Role_newRoleSet_010.gif]]
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Right click on the FacetSet element and choose the "New Child > Facet"
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action to create a facet.
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[[Image:MoDisco_Role_newRoleSet_011.gif]]
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Set the facet name and the class that the facet will extend.
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[[Image:MoDisco_Role_newRoleSet_012.gif]]
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To specify how to know if an object conforms to a facet, we have
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to provide a boolean query. To provide this query we have to load the
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model containing its description.
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[[Image:MoDisco_Role_newRoleSet_013.gif]]
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The query has to be referred to using the MoDisco protocol:
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"modisco:/query/<querySetName>". In the example, we use the "My"
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query set.
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[[Image:MoDisco_Role_newRoleSet_014.gif]]
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Once the query set resource is referenced, we just have to select the
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query describing the facet. In the example this query is named
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"isAbstract".
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[[Image:MoDisco_Role_newRoleSet_015.gif]]
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At this step, if we save the model, the "red cross" should disappear
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from the file icon. This means that the facet set model is now valid.
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[[Image:MoDisco_Role_newRoleSet_016.gif]]
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If the facet has specific attributes or references which can be
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calculated, we can declare them. In this example, we will declare an
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attribute indicating the number of abstract methods contained in the
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abstract class. To create a new facet attribute right-click on the facet
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element and select the "New Child > FacetAttribute" item.
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[[Image:MoDisco_Role_newRoleSet_017.gif]]
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The attribute's type and name must be set. The "Value Query" field must
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be filled with a reference to a query which is used to calculate the
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attribute's value. This query must have the same type as the attribute
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and be applicable to the virtually extended class.
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[[Image:MoDisco_Role_newRoleSet_018.gif]]
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The facet set is now ready to be used.
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== How to consult the MoDisco facet set catalog through the UI ==
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If a facet set model is valid, it is registered in the facet set
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catalog. To consult the facet set catalog, we can use the "Facet Set"
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view.
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To open this view select "Windows > Show view > Other ..."
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in the menu bar and choose "Facet Set" in the list.
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[[Image:MoDisco_Role_newRoleSet_019.gif]]
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[[Image:MoDisco_Role_newRoleSet_020.gif]]
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The "Facet set" view presents the available facet sets and their
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facets. For each facet set the location of its description model is pointed out.
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[[Image:MoDisco_Role_newRoleSet_021.gif]]
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== How to programmatically use the MoDisco facet set catalog ==
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Here is an example of using the MoDisco facet API. For more information please refer to the JavaDoc.
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import org.eclipse.emf.ecore.EObject;
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import org.eclipse.gmt.modisco.infra.query.core.exception.ModelQueryException;
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import org.eclipse.gmt.modisco.infra.facet.Facet;
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import org.eclipse.gmt.modisco.infra.facet.FacetSet;
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import org.eclipse.gmt.modisco.infra.facet.core.FacetSetCatalog;
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import org.eclipse.gmt.modisco.infra.facet.core.exception.ModiscoFacetException;
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public class Example {
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public Integer getNbAbstractMethod(EObject eObject)
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throws ModelQueryException, ModiscoFacetException {
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FacetSet facetSet = FacetSetCatalog.getSingleton().getFacetSet("My");
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FacetContext context = new FacetContext();
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context.addFacetSet(facetSet);
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Facet facet = facetSet.getFacet("AbstractClassDeclaration");
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if (context.isInstance(eObject, facet)) {
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Object object = context.get(eObject, facet
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.getEStructuralFeature("nbAbstractMethod"));
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if (object instanceof Integer) {
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Integer nbAbstractMethod = (Integer) object;
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return nbAbstractMethod;
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}
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}
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return null;
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}
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}
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== How to package a facet set in a plug-in ==
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To package a facet set in a plug-in, an extension must be added in the file plugin.xml (contained by the facet set’s project). The extension point to use is: org.eclipse.gmt.modisco.infra.facet.registration.
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Here is an example of query set declaration:
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  <plugin>
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      <extension
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          point="org.eclipse.gmt.modisco.infra.facet.registration">
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        <facetset
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              file="_example_jdkAndEclipseFacets.facetSet">
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        </facetset>
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    </extension>
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  </plugin>
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Thanks to this extension declaration, The MoDisco project is ready to be exported has a plug-in.
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== Facet Meta-model Description ==
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[[Image:MoDisco_Role_metamodel.png]]
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The facet meta-model extends the ecore meta-model and uses the query meta-model.
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A FacetSet is a kind of EPackage. A FacetSet contains facets through
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the eClassifier reference. A facet is a kind of EClass.
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For a facet instance, the eSuperType reference must be set to
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specify which class the facet virtually extends.
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The facet class has one specific reference: conditionQuery. The
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conditionQuery reference points to the ModelQuery class. The model queries
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pointed to by the conditionQuery reference must return a Boolean. Those
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queries are used to specify how to decide whether an instance conforms to a
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facet. If the conditionQuery is empty then all the instances of the class
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referred to by the facet instance through the eSuperType reference conform
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to this facet.
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A facet contains facetAttributes and facetReferences through the
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eStructuralFeature reference. The FacetAttribute and FacetReference
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classes have a common super class: FacetStructuralFeature. The
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FacetStructuralFeature has one reference named valueQuery pointing to
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the ModelQuery class. The valueQuery is used to compute the facet
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structural feature value. The facetAttribute and facetReference must have
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the same type as the query they refer to.
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[[Category:MoDisco]]
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Latest revision as of 10:34, 2 April 2012

  1. REDIRECT MoDisco/Moved To Help Center

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