/*
* Copyright 2003-2014 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jetbrains.mps.nodeEditor;
import jetbrains.mps.smodel.SNodePointer;
import jetbrains.mps.smodel.event.SModelChildEvent;
import jetbrains.mps.smodel.event.SModelEvent;
import jetbrains.mps.smodel.event.SModelEventVisitorAdapter;
import jetbrains.mps.smodel.event.SModelPropertyEvent;
import jetbrains.mps.smodel.event.SModelReferenceEvent;
import jetbrains.mps.smodel.event.SModelRootEvent;
import jetbrains.mps.util.Pair;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.openapi.model.SModelReference;
import org.jetbrains.mps.openapi.model.SNode;
import org.jetbrains.mps.openapi.model.SNodeId;
import org.jetbrains.mps.openapi.model.SNodeReference;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
/**
* User: shatalin
* Date: 12/07/14
*/
public class SModelModificationsCollector extends SModelEventVisitorAdapter {
private Collection<Pair<SNode, SNodeReference>> myModifications = null;
// TODO: move to jetbrains.mps.nodeEditor.updater package, make package-local
public SModelModificationsCollector(List<SModelEvent> events) {
if (events == null) {
return;
}
myModifications = new LinkedHashSet<Pair<SNode, SNodeReference>>();
for (SModelEvent event : events) {
event.accept(this);
}
}
public List<Pair<SNode, SNodeReference>> getModifications() {
return myModifications == null ? null : new ArrayList<Pair<SNode, SNodeReference>>(myModifications);
}
@Override
public void visitRootEvent(SModelRootEvent event) {
Queue<SNode> nodeQueue = new LinkedList<SNode>();
nodeQueue.add(event.getRoot());
while (!nodeQueue.isEmpty()) {
SNode nextNode = nodeQueue.remove();
for (SNode child : nextNode.getChildren()) {
nodeQueue.add(child);
}
addModification(nextNode, event);
}
}
@Override
public void visitChildEvent(SModelChildEvent event) {
addModification(event.getParent(), event);
Queue<SNode> nodeQueue = new LinkedList<SNode>();
nodeQueue.add(event.getChild());
while (!nodeQueue.isEmpty()) {
SNode nextNode = nodeQueue.remove();
for (SNode child : nextNode.getChildren()) {
nodeQueue.add(child);
}
addModification(nextNode, event);
}
}
@Override
public void visitReferenceEvent(SModelReferenceEvent event) {
addModification(event.getReference().getSourceNode(), event);
}
@Override
public void visitPropertyEvent(SModelPropertyEvent event) {
addModification(event.getNode(), event);
}
private void addModification(SNode node, SModelEvent event) {
myModifications.add(new Pair<SNode, SNodeReference>(node, new CachingSNodePointer(event.getModel().getReference(), node.getNodeId())));
}
// TODO: move this logic to SNodePointer? Ask MMuhin.
private static class CachingSNodePointer extends SNodePointer {
private int myHashCode = -1;
private CachingSNodePointer(@Nullable SModelReference modelReference, @Nullable SNodeId nodeId) {
super(modelReference, nodeId);
}
@Override
public int hashCode() {
if (myHashCode == -1) {
myHashCode = super.hashCode();
}
return myHashCode;
}
}
}