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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.relations;
import org.eclipse.graphiti.mm.pictograms.Anchor;
import org.eclipse.graphiti.mm.pictograms.Connection;
import org.eclipse.graphiti.mm.pictograms.ContainerShape;
import org.eclipse.jpt.jpa.core.context.PersistentType;
import org.eclipse.jpt.jpadiagrameditor.ui.internal.provider.IJPAEditorFeatureProvider;
import org.eclipse.jpt.jpadiagrameditor.ui.internal.util.JPAEditorConstants;
import org.eclipse.jpt.jpadiagrameditor.ui.internal.util.JPAEditorUtil;
public class IsARelation {
protected final static String SEPARATOR = ";isA;"; //$NON-NLS-1$
public final static String IS_A_CONNECTION_PROP_KEY = "is_is_a_connection"; //$NON-NLS-1$
protected PersistentType subclass;
protected PersistentType superclass;
public IsARelation(PersistentType subclass,
PersistentType superclass) {
this.subclass = subclass;
this.superclass = superclass;
}
public IsARelation(IJPAEditorFeatureProvider fp, Connection conn) {
Anchor start = conn.getStart();
Anchor end = conn.getEnd();
Object startObj = fp.getBusinessObjectForPictogramElement((ContainerShape)start.eContainer());
Object endObj = fp.getBusinessObjectForPictogramElement((ContainerShape)end.eContainer());
if ((startObj == null) || (endObj == null))
throw new NullPointerException("Some of the connection ends is null"); //$NON-NLS-1$
if (!(startObj instanceof PersistentType) || !(endObj instanceof PersistentType))
throw new IllegalArgumentException();
this.subclass = (PersistentType)startObj;
this.superclass = (PersistentType)endObj;
}
public PersistentType getSubclass() {
return subclass;
}
public PersistentType getSuperclass() {
return superclass;
}
public static boolean isIsAConnection(Connection conn) {
String val = JPAEditorUtil.getPeUtil().getPropertyValue(conn, IS_A_CONNECTION_PROP_KEY);
return (Boolean.TRUE.toString().equals(val));
}
public String getId() {
return generateId(subclass, superclass);
}
public static String generateId(IJPAEditorFeatureProvider fp, Connection conn) {
Anchor start = conn.getStart();
Anchor end = conn.getEnd();
Object startObj = fp.getBusinessObjectForPictogramElement((ContainerShape)start.eContainer());
Object endObj = fp.getBusinessObjectForPictogramElement((ContainerShape)end.eContainer());
if ((startObj == null) || (endObj == null))
return null;
if (!(startObj instanceof PersistentType) || !(endObj instanceof PersistentType))
return null;
PersistentType startJpt = (PersistentType)startObj;
PersistentType endJpt = (PersistentType)endObj;
return generateId(startJpt, endJpt);
}
private static String generateId(PersistentType startJpt, PersistentType endJpt) {
return JPAEditorConstants.IS_A_RELATION_ID_PREFIX +
startJpt.getName() + SEPARATOR + endJpt.getName();
}
@Override
public boolean equals(Object otherRel) {
if (!IsARelation.class.isInstance(otherRel))
return false;
return getId().equals(((IsARelation)otherRel).getId());
}
@Override
public int hashCode() {
return getId().hashCode();
}
}
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