/*
* Copyright 2003-2013 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.openapi.editor.cells.traversal;
import jetbrains.mps.openapi.editor.cells.EditorCell;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.openapi.util.TreeIterator;
public class CellTreeIterable implements Iterable<EditorCell> {
@Nullable
private final EditorCell myRoot;
@NotNull
private final EditorCell myStart;
private final Direction myDirection;
private boolean mySkipStart;
public CellTreeIterable(@Nullable EditorCell root, @NotNull EditorCell start, boolean forward) {
myRoot = root;
myStart = start;
myDirection = forward ? Direction.FORWARD : Direction.BACKWARD;
}
public CellTreeIterable skipStart() {
return skipStart(true);
}
public CellTreeIterable skipStart(boolean skipStart) {
mySkipStart = skipStart;
return this;
}
@Override
public TreeIterator<EditorCell> iterator() {
TreeIterator<EditorCell> result;
if (myRoot == myStart) {
result = new CellSubtreeIterator(myRoot, myDirection);
} else {
result = new CellTreeIterator(myRoot, myStart, myDirection);
}
if (mySkipStart) {
result.next();
}
return result;
}
}