platform/platform-api/src/com/intellij/ide/util/treeView/AbstractTreeStructure.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package com.intellij.ide.util.treeView;
  18
  19 import org.jetbrains.annotations.NotNull;
  20 import org.jetbrains.annotations.Nullable;
  21
  22 public abstract class AbstractTreeStructure {
  23   public abstract Object getRootElement();
  24   public abstract Object[] getChildElements(Object element);
  25   @Nullable
  26   public abstract Object getParentElement(Object element);
  27
  28   @NotNull
  29   public abstract NodeDescriptor createDescriptor(Object element, NodeDescriptor parentDescriptor);
  30
  31   public abstract void commit();
  32   public abstract boolean hasSomethingToCommit();
  33
  34   public boolean isToBuildChildrenInBackground(Object element){
  35     return false;
  36   }
  37
  38   public boolean isAlwaysLeaf(Object element) {
  39     return false;
  40   }
  41
  42 }