/*
* 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.nodeEditor.selectionRestoring;
import jetbrains.mps.nodeEditor.cells.EditorCell_Collection;
import jetbrains.mps.openapi.editor.EditorContext;
import jetbrains.mps.openapi.editor.cells.EditorCell;
import jetbrains.mps.util.IterableUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
public class ChildCellLocator implements CellLocator {
@NotNull
private final CellLocator myParentLocator;
private final int myChildIndex;
public ChildCellLocator(@NotNull CellLocator parentLocator, int childIndex) {
myParentLocator = parentLocator;
myChildIndex = childIndex;
}
@Nullable
@Override
public EditorCell locate(@NotNull EditorContext editorContext) {
EditorCell parent = myParentLocator.locate(editorContext);
if (!(parent instanceof EditorCell_Collection)) {
return null;
}
EditorCell_Collection parentCollection = (EditorCell_Collection) parent;
if (myChildIndex < 0 || myChildIndex >= parentCollection.getCellsCount()) {
return null;
}
return IterableUtil.get(parentCollection, myChildIndex);
}
}