CreateRelationshipAction.java example

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package org.apache.cayenne.modeler.action;

import org.apache.cayenne.configuration.ConfigurationNode;
import org.apache.cayenne.configuration.DataChannelDescriptor;
import org.apache.cayenne.dbsync.naming.NameBuilder;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.map.DbRelationship;
import org.apache.cayenne.map.Entity;
import org.apache.cayenne.map.ObjEntity;
import org.apache.cayenne.map.ObjRelationship;
import org.apache.cayenne.map.Relationship;
import org.apache.cayenne.map.event.MapEvent;
import org.apache.cayenne.map.event.RelationshipEvent;
import org.apache.cayenne.modeler.Application;
import org.apache.cayenne.modeler.ProjectController;
import org.apache.cayenne.modeler.event.RelationshipDisplayEvent;
import org.apache.cayenne.modeler.undo.CreateRelationshipUndoableEdit;
import org.apache.cayenne.modeler.util.CayenneAction;
import org.apache.cayenne.util.DeleteRuleUpdater;

import java.awt.event.ActionEvent;

public class CreateRelationshipAction extends CayenneAction {

    /**
     * Constructor for CreateRelationshipAction.
     */
    public CreateRelationshipAction(Application application) {
        super(getActionName(), application);
    }

    public static String getActionName() {
        return "Create Relationship";
    }

    /**
     * Fires events when a obj rel was added
     */
    static void fireObjRelationshipEvent(Object src, ProjectController mediator, ObjEntity objEntity,
                                         ObjRelationship rel) {

        mediator.fireObjRelationshipEvent(new RelationshipEvent(src, rel, objEntity, MapEvent.ADD));

        RelationshipDisplayEvent rde = new RelationshipDisplayEvent(src, rel, objEntity, mediator.getCurrentDataMap(),
                (DataChannelDescriptor) mediator.getProject().getRootNode());

        mediator.fireObjRelationshipDisplayEvent(rde);
    }

    /**
     * Fires events when a db rel was added
     */
    static void fireDbRelationshipEvent(Object src, ProjectController mediator, DbEntity dbEntity, DbRelationship rel) {

        mediator.fireDbRelationshipEvent(new RelationshipEvent(src, rel, dbEntity, MapEvent.ADD));

        RelationshipDisplayEvent rde = new RelationshipDisplayEvent(src, rel, dbEntity, mediator.getCurrentDataMap(),
                (DataChannelDescriptor) mediator.getProject().getRootNode());

        mediator.fireDbRelationshipDisplayEvent(rde);
    }

    @Override
    public String getIconName() {
        return "icon-relationship.png";
    }

    /**
     * @see org.apache.cayenne.modeler.util.CayenneAction#performAction(ActionEvent)
     */
    @Override
    public void performAction(ActionEvent e) {
        ObjEntity objEnt = getProjectController().getCurrentObjEntity();
        if (objEnt != null) {

            ObjRelationship rel = new ObjRelationship();
            rel.setName(NameBuilder.builder(rel, objEnt).name());
            createObjRelationship(objEnt, rel);

            application.getUndoManager().addEdit(
                    new CreateRelationshipUndoableEdit(objEnt, new ObjRelationship[]{rel}));
        } else {
            DbEntity dbEnt = getProjectController().getCurrentDbEntity();
            if (dbEnt != null) {

                DbRelationship rel = new DbRelationship();
                rel.setName(NameBuilder.builder(rel, dbEnt).name());
                createDbRelationship(dbEnt, rel);

                application.getUndoManager().addEdit(
                        new CreateRelationshipUndoableEdit(dbEnt, new DbRelationship[]{rel}));
            }
        }
    }

    public void createObjRelationship(ObjEntity objEntity, ObjRelationship rel) {
        ProjectController mediator = getProjectController();

        rel.setSourceEntity(objEntity);
        DeleteRuleUpdater.updateObjRelationship(rel);

        objEntity.addRelationship(rel);
        fireObjRelationshipEvent(this, mediator, objEntity, rel);
    }

    public void createDbRelationship(DbEntity dbEntity, DbRelationship rel) {
        ProjectController mediator = getProjectController();

        rel.setSourceEntity(dbEntity);
        dbEntity.addRelationship(rel);

        fireDbRelationshipEvent(this, mediator, dbEntity, rel);
    }

    /**
     * Returns <code>true</code> if path contains an Entity object.
     */
    @Override
    public boolean enableForPath(ConfigurationNode object) {
        if (object == null) {
            return false;
        }

        if (object instanceof Relationship) {
            return ((Relationship) object).getParent() != null && ((Relationship) object).getParent() instanceof Entity;
        }

        return false;
    }
}