/*******************************************************************************
* Copyright (c) 2012 Association for Decentralized Information Management in
* Industry THTH ry.
* 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:
* VTT Technical Research Centre of Finland - initial API and implementation
*******************************************************************************/
package org.simantics.modeling.adapters;
import gnu.trove.set.hash.THashSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Set;
import org.simantics.db.Resource;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.utils.OrderedSetUtils;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.adapter.Remover;
import org.simantics.db.layer0.adapter.impl.AbstractRemover;
import org.simantics.db.layer0.adapter.impl.EntityRemover;
import org.simantics.db.layer0.util.RemoverUtil;
import org.simantics.diagram.content.ConnectionUtil;
import org.simantics.diagram.stubs.DiagramResource;
import org.simantics.layer0.utils.binaryPredicates.OrderedSetElementsPredicate;
import org.simantics.modeling.ModelingResources;
import org.simantics.structural.stubs.StructuralResource2;
/**
* A {@link Remover} implementation for removing DIA.Element instances.
*
* The implementation has separate paths for STR.Connection instances and other
* DIA.Element instances. For DIA.Element this remover will:
*
* - List connections/monitors the element is attached to
* - Disconnect the element from its owner diagram(s)
* - Remove the element itself with EntityRemover default logic
* - Recursively remove all related degenerate connections, i.e. connections
* that only have one connector after remove the one connected to this removed
* element.
* - Recursively remove monitors attached to the removed element
*
*
*
* For STR.Connections this remover will:
*
* - List all related data (monitors, mapped data)
* - Remove the connection itself
* - Remove the related data
*
*
* @author Tuukka Lehtonen
*/
public class ElementRemover extends AbstractRemover {
private static final boolean DEBUG = false;
public ElementRemover(Resource element) {
super(element);
}
@Override
public void remove(WriteGraph graph) throws DatabaseException {
// 0. Find all connections to the removed element
StructuralResource2 STR = StructuralResource2.getInstance(graph);
if (graph.isInstanceOf(resource, STR.Connection)) {
removeConnection(graph);
} else {
removeElement(graph);
}
}
public void removeElement(WriteGraph graph) throws DatabaseException {
if (DEBUG)
System.out.println(this + " removing element");
Set connectors = null;
StructuralResource2 STR = StructuralResource2.getInstance(graph);
DiagramResource DIA = DiagramResource.getInstance(graph);
Collection connectedTo = graph.getObjects(resource, STR.IsConnectedTo);
for (Resource connector : connectedTo) {
if (connectors == null)
connectors = new THashSet(connectedTo.size());
connectors.add(connector);
}
Collection monitors = graph.getObjects(resource, DIA.HasMonitorComponent_Inverse);
if (DEBUG) {
if (connectors != null)
System.out.println(this + " found " + connectors.size() + " connectors connected to element");
if (!monitors.isEmpty())
System.out.println(this + " found " + monitors.size() + " monitors attached to element");
}
// 1. Disconnect element from diagrams
for (Resource diagram : OrderedSetElementsPredicate.INSTANCE.getSubjects(graph, resource)) {
OrderedSetUtils.remove(graph, diagram, resource);
}
// 2. Delete element itself
EntityRemover.remove(graph, resource);
// 3. Recursively remove all related degenerate connections
// i.e. connections that only have one connector after remove the
// one connected to this removed element.
ConnectionUtil cu = null;
Set connectionsToRemove = null;
if (connectors != null) {
cu = new ConnectionUtil(graph);
Set touchedConnections = new THashSet(connectors.size());
for (Resource connector : connectors) {
Resource connection = ConnectionUtil.tryGetConnection(graph, connector);
if (connection != null)
touchedConnections.add(connection);
cu.removeConnectionPart(connector);
}
for (Resource connection : touchedConnections) {
int removedConnectors = cu.removeUnusedConnectors(connection);
if (DEBUG)
System.out.println(this + " PRUNED " + removedConnectors + " UNUSED CONNECTORS FROM TOUCHED CONNECTION " + connection);
while (true) {
int removedInteriorRouteNodes = cu.removeExtraInteriorRouteNodes(connection);
if (DEBUG)
System.out.println(this + " PRUNED " + removedInteriorRouteNodes + " INTERIOR ROUTE NODES FROM TOUCHED CONNECTION " + connection);
if (removedInteriorRouteNodes == 0)
break;
}
int connectorCount = cu.getConnectedConnectors(connection, null).size();
if (DEBUG)
System.out.println(this + " \t" + connectorCount + " CONNECTORS LEFT");
if (connectorCount < 2) {
if (connectionsToRemove == null)
connectionsToRemove = new THashSet(touchedConnections.size());
connectionsToRemove.add(connection);
}
}
}
if (connectionsToRemove != null) {
for (Resource connection : connectionsToRemove) {
if (DEBUG)
System.out.println(this + " REMOVING connection " + connection);
RemoverUtil.remove(graph, connection);
}
}
// 4. Recursively remove monitors attached to element
if (!monitors.isEmpty())
for (Resource monitor : monitors)
RemoverUtil.remove(graph, monitor);
}
public void removeConnection(WriteGraph graph) throws DatabaseException {
if (DEBUG)
System.out.println(this + " removing connection element");
DiagramResource DIA = DiagramResource.getInstance(graph);
ModelingResources MOD = ModelingResources.getInstance(graph);
// 0. Get set of related data
Collection objects = new ArrayList();
for (Resource relation : new Resource[] {
DIA.HasMonitorComponent_Inverse,
MOD.ElementToComponent,
MOD.DiagramConnectionToConnection,
MOD.DiagramConnectionToConnectionSpecial
}) {
for (Resource object : graph.getObjects(resource, relation)) {
if (!object.equals(resource))
objects.add(object);
}
}
// 1. Remove connection itself
new ConnectionUtil(graph).removeConnection(resource);
// 2. Recursively remove related data
if (!objects.isEmpty())
for (Resource object : objects)
RemoverUtil.remove(graph, object);
}
@Override
public String toString() {
return getClass().getSimpleName() + resource;
}
}