Interroger un modèle EMF avec le projet EMF Model Query

package monCode;
 
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.widgets.Event;
import org.eclipse.ui.IActionDelegate2;
import org.eclipse.ui.IEditorActionDelegate;
import org.eclipse.ui.IEditorPart;
 
public class AbstractQueryDelegate implements IEditorActionDelegate,
        IActionDelegate2 {
 
    @Override
    public void run(IAction action) {
        // TODO Auto-generated method stub
 
    }
 
    @Override
    public void selectionChanged(IAction action, ISelection selection) {
        // TODO Auto-generated method stub
 
    }
 
    @Override
    public void init(IAction action) {
        // TODO Auto-generated method stub
 
    }
 
    @Override
    public void dispose() {
        // TODO Auto-generated method stub
 
    }
 
    @Override
    public void runWithEvent(IAction action, Event event) {
        // TODO Auto-generated method stub
 
    }
 
    @Override
    public void setActiveEditor(IAction action, IEditorPart targetEditor) {
        // TODO Auto-generated method stub
 
    }
 
}

package monCode;
 
import graphe.presentation.GrapheEditor;
 
import java.util.Collection;
 
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IActionDelegate2;
import org.eclipse.ui.IEditorActionDelegate;
import org.eclipse.ui.IEditorPart;
 
/**
 * This action delegate queries the user for the name of a class. Then it uses
 * the query APIs to find the class and selects it in the editor.
 * 
 * @see IEditorActionDelegate
 */
publicabstractclass AbstractQueryDelegate
    implements IEditorActionDelegate, IActionDelegate2 {
 
    /**
     * Error message to display when an exception occurred
     */
    protectedstaticfinal String MESSAGE_EXCEPTION = 
        "QueryStatementsMessages.message_exception";
 
    /**
     * The shell this action is hosted in
     */
    protected Shell shell = null;
 
    /**
     * The active editor
     */
    protected GrapheEditor editor = null;
 
    /**
     * Selected EObjects
     */
    protected Collection<EObject> selectedEObjects = null;
 
    /**
     * The InputDialog title
     */
    protected String title;
 
    /**
     * The InputDialog message
     */
    protected String message;
 
    /**
     * The message to output when query result set is empty
     */
    protected String notFoundMessage;
 
    /**
     * Constructor
     */
    public AbstractQueryDelegate(String titleIn, 
            String messageIn, String notFoundMessageIn) {
        title = titleIn;
        message = messageIn;
        notFoundMessage = notFoundMessageIn;
    }
 
    /**
     * Perform a query that returns a set of objects.
     * 
     * @param value
     *            The value used to drive the query
     * @return The set of objects returned by the query
     */
    protectedabstract Collection<EObject> performQuery(Object value)
        throws Exception;
 
    /*
     * @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction,
     *      org.eclipse.jface.viewers.ISelection)
     */
    publicvoid selectionChanged(IAction action, 
            final ISelection selection) {
        this.selectedEObjects = null;
        try {
            if (selection instanceof IStructuredSelection) {
                IStructuredSelection structuredSelection = 
                    (IStructuredSelection) selection;
                this.selectedEObjects = 
                    new java.util.ArrayList<EObject>();
                for (Object next : structuredSelection.toList()) {
                    if (next instanceof EObject) {
                        selectedEObjects.add((EObject) next);
                    }
                }
            }
        } catch (Exception e) {
            // Exceptions are not expected
            MessageDialog.openInformation(shell, 
                    title, MESSAGE_EXCEPTION);
            thrownew RuntimeException(e);
        } finally {
            action.setEnabled((null != selectedEObjects));
        }
    }
 
    /*
     * @see org.eclipse.ui.IActionDelegate2#dispose()
     */
    publicvoid dispose() {
        //No-op
    }
 
    /*
     * @see org.eclipse.ui.IEditorActionDelegate#setActiveEditor(org.eclipse.jface.action.IAction,
     *      org.eclipse.ui.IEditorPart)
     */
    publicvoid setActiveEditor(IAction action, 
            IEditorPart targetEditor) {
        this.editor = (GrapheEditor) targetEditor;
        if ( targetEditor != null ) {
            this.shell = targetEditor.getSite().getShell();
        }
    }
 
    /*
     * @see org.eclipse.ui.IActionDelegate2#init(org.eclipse.jface.action.IAction)
     */
    publicvoid init(IAction action) {
        // No-op
    }
 
    /*
     * @see org.eclipse.ui.IActionDelegate2#runWithEvent(org.eclipse.jface.action.IAction,
     *      org.eclipse.swt.widgets.Event)
     */
    publicvoid runWithEvent(IAction action, Event event) {
        run(action);
    }
}

package monCode;
 
import graphe.GraphePackage;
 
import java.util.Collection;
 
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.query.conditions.eobjects.EObjectCondition;
import org.eclipse.emf.query.conditions.eobjects.structuralfeatures.EObjectAttributeValueCondition;
import org.eclipse.emf.query.conditions.numbers.NumberCondition;
import org.eclipse.emf.query.statements.FROM;
import org.eclipse.emf.query.statements.SELECT;
import org.eclipse.emf.query.statements.WHERE;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
 
publicclass SelectBigCostNodesDelegate extends AbstractQueryDelegate {
 
    public SelectBigCostNodesDelegate() {
        super("Sélection nœuds de cout supérieur ou égal à 5",
                null,
                "Pas de nœud de cout supérieur ou égal à 5");
    }
 
    @Override
    publicvoid run(IAction action) {
        try {
            Collection<EObject> result = performQuery(null);
            if (result.isEmpty()) {
                MessageDialog
                    .openInformation(shell, title, notFoundMessage);
            } else {
                this.editor.setSelectionToViewer(result);
            }
        } catch (Exception e) {
            // Exceptions are not expected
            MessageDialog.openInformation(shell, title, MESSAGE_EXCEPTION);
            thrownew RuntimeException(e);
        }
 
    }
 
    @Override
    protected Collection<EObject> performQuery(Object value) throws Exception {
 
        /*
         * Looking for nodes whose "cout" > 5
         */
        EObjectCondition condition = 
            new EObjectAttributeValueCondition(
                GraphePackage.eINSTANCE.getNoeuds_Cout(), 
                NumberCondition.between(5,Integer.MAX_VALUE));
 
        // Build the select query statement
        SELECT select = new SELECT(
                new FROM(selectedEObjects), 
                new WHERE(condition));
 
        // Execute query
        return select.execute();
 
 
    }
}