/*
 * Copyright 2000-2014 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 com.intellij.vcs.log.graph.utils;

import com.intellij.util.containers.IntStack;
import org.jetbrains.annotations.NotNull;

public class DfsUtil {
  private final IntStack myStack;

  public DfsUtil() {
    myStack = new IntStack();
  }

  public interface NextNode {
    int NODE_NOT_FOUND = -1;

    int fun(int currentNode);
  }

  public void nodeDfsIterator(int startRowIndex, @NotNull NextNode nextNodeFun) {
    myStack.push(startRowIndex);

    while (!myStack.empty()) {
      int nextNode = nextNodeFun.fun(myStack.peek());
      if (nextNode != NextNode.NODE_NOT_FOUND) {
        myStack.push(nextNode);
      } else {
        myStack.pop();
      }
    }
  }
}

@@ -757,90 +757,25 @@
 %0A  p
-rivate final IntStack myStack;%0A%0A  public DfsUtil() %7B%0A    myStack = new IntStack();
+ublic DfsUtil() %7B
 %0A  %7D
@@ -949,24 +949,63 @@
 tNodeFun) %7B%0A
+    IntStack myStack = new IntStack();%0A
     myStack.
@@ -1238,20 +1238,41 @@
       %7D%0A
-
     %7D%0A
+    myStack.clear();%0A
   %7D%0A%7D%0A

clear IntStack in DfsUtil.