/*
* Copyright 2003-2015 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.smodel.loading;
import jetbrains.mps.extapi.model.SModelData;
import jetbrains.mps.smodel.InterfaceSNode;
import jetbrains.mps.smodel.LazySNode;
import jetbrains.mps.util.IterableUtil;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.mps.openapi.language.SContainmentLink;
import org.jetbrains.mps.openapi.model.SModel;
import org.jetbrains.mps.openapi.model.SNode;
import org.jetbrains.mps.openapi.model.SNodeId;
import java.util.Iterator;
/**
* Takes partially-loaded model and fills it with nodes from a fully-loaded counterpart.
* Preserves instances of original partially-loaded model as they might be already exposed to user code
* (i.e. full load triggered as part of model traversal, with partial root already accessed by a client).
* Fully-loaded model is not preserved.
* SHALL MOVE TO [smodel] once LazySNode and InterfaceSNode move there (either with SNode or as interfaces).
*/
public class PartialModelUpdateFacility {
private static final Logger LOG = LogManager.getLogger(PartialModelUpdateFacility.class);
private SModelData myModel;
private SModelData myFullModel;
private final SModel myDataOwner;
/**
*
* @param model model being updated, survives.
* @param fullModel source of nodes to inject into updated models, for disposal.
* @param dataOwner provides extra information about location in case anything goes wrong
*/
public PartialModelUpdateFacility(@NotNull SModelData model, @NotNull SModelData fullModel, @NotNull SModel dataOwner) {
myModel = model;
myFullModel = fullModel;
myDataOwner = dataOwner;
}
/**
* Update initial model with elements from full model. Instance of initial model is the one to keep.
*/
public void update() {
for (SNode root : myModel.getRootNodes()) {
if (root instanceof LazySNode) {
SNode fullRoot = myFullModel.getNode(root.getNodeId());
if (fullRoot == null) continue; //this can happen after model update if the
for (SNode child : IterableUtil.copyToList(fullRoot.getChildren())) {
SContainmentLink role = child.getContainmentLink();
fullRoot.removeChild(child);
root.addChild(role, child);
}
} else if (root instanceof InterfaceSNode) {
update((InterfaceSNode) root);
}
}
}
private void update(InterfaceSNode node) {
if (node.hasSkippedChildren()) {
SNode fullNode = myFullModel.getNode(node.getNodeId());
if (fullNode == null) {
final String m = "model %s: no peer node in full model for %s (in %s)";
LOG.error(String.format(m, myModel.getReference().getModelName(), node.getNodeId(), myDataOwner.getSource().getLocation()));
return;
}
Iterator<? extends SNode> it = fullNode.getChildren().iterator();
SNode curr = it.hasNext() ? it.next() : null;
for (SNode child : node.getChildren()) {
SNodeId childId = child.getNodeId();
while (curr != null && !childId.equals(curr.getNodeId())) {
SNode next = it.hasNext() ? it.next() : null;
SContainmentLink role = curr.getContainmentLink();
curr.delete();
node.insertChildBefore(role, curr, child);
curr = next;
}
if (curr != null && childId.equals(curr.getNodeId())) {
// skip
curr = it.hasNext() ? it.next() : null;
}
if (curr == null) {
break;
}
}
while (curr != null) {
SNode next = it.hasNext() ? it.next() : null;
SContainmentLink role = curr.getContainmentLink();
curr.delete();
node.addChild(role, curr);
curr = next;
}
node.cleanSkippedRoles();
}
for (SNode n : node.getChildren()) {
if (n instanceof InterfaceSNode) {
update((InterfaceSNode) n);
}
}
}
}