/*
* Copyright 2003-2011 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 org.jetbrains.mps.openapi.util;
import java.util.Iterator;
/**
* Tree iterator traverses a n-ary tree in a way that a parent node is visited before its children and
* children are returned left-to-right.
*/
public interface TreeIterator<T> extends Iterator<T> {
/**
* Skip children of the last element returned by the iterator.
*
* @throws IllegalStateException if the <tt>next</tt> method has not yet been called
*/
void skipChildren();
}