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/*******************************************************************************
* <copyright>
*
* Copyright (c) 2005, 2010 SAP AG.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Stefan Dimov - initial API, implementation and documentation
*
* </copyright>
*
*******************************************************************************/
package org.eclipse.jpt.jpadiagrameditor.ui.internal.feature;
import org.eclipse.graphiti.features.context.ICreateConnectionContext;
import org.eclipse.graphiti.features.context.impl.AddConnectionContext;
import org.eclipse.graphiti.features.impl.AbstractCreateConnectionFeature;
import org.eclipse.graphiti.mm.pictograms.Anchor;
import org.eclipse.graphiti.mm.pictograms.Connection;
import org.eclipse.graphiti.mm.pictograms.PictogramElement;
import org.eclipse.jpt.jpa.core.context.PersistentType;
import org.eclipse.jpt.jpa.core.context.java.JavaPersistentType;
import org.eclipse.jpt.jpadiagrameditor.ui.internal.provider.IJPAEditorFeatureProvider;
import org.eclipse.jpt.jpadiagrameditor.ui.internal.relations.AbstractRelation;
abstract public class CreateRelationFeature extends AbstractCreateConnectionFeature {
public CreateRelationFeature(IJPAEditorFeatureProvider fp, String name, String description) {
super(fp, name, description);
}
public boolean canCreate(ICreateConnectionContext context) {
JavaPersistentType source = (JavaPersistentType)getPersistentType(context.getSourceAnchor());
JavaPersistentType target = (JavaPersistentType)getPersistentType(context.getTargetAnchor());
if (source != null && target != null) {
return true;
}
return false;
}
public boolean canStartConnection(ICreateConnectionContext context) {
if (getPersistentType(context.getSourceAnchor()) != null)
return true;
return false;
}
public Connection create(ICreateConnectionContext context) {
Connection newConnection = null;
PersistentType source = getPersistentType(context.getSourceAnchor());
PersistentType target = getPersistentType(context.getTargetAnchor());
if (source != null && target != null) {
AbstractRelation rel = createRelation(getFeatureProvider(), context.getSourceAnchor().getParent(),
context.getTargetAnchor().getParent());
AddConnectionContext addContext =
new AddConnectionContext(context.getSourceAnchor(), context
.getTargetAnchor());
addContext.setNewObject(rel);
newConnection =
(Connection) getFeatureProvider().addIfPossible(addContext);
}
return newConnection;
}
/**
* Returns the PersistentType class belonging to the anchor, or null if not available.
*/
protected PersistentType getPersistentType(Anchor anchor) {
if (anchor != null) {
Object refObject =
getBusinessObjectForPictogramElement(anchor.getParent());
if (refObject instanceof PersistentType) {
return (PersistentType) refObject;
}
}
return null;
}
/**
* Creates a new OneToOneRelation between two PersistentType classes.
*/
abstract protected AbstractRelation createRelation(IJPAEditorFeatureProvider fp, PictogramElement source,
PictogramElement target);
public IJPAEditorFeatureProvider getFeatureProvider() {
return (IJPAEditorFeatureProvider)super.getFeatureProvider();
}
}
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