| /* |
| * Copyright 2000-2009 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.ui.treeStructure; |
| |
| import com.intellij.ide.util.treeView.NodeDescriptor; |
| import com.intellij.openapi.project.Project; |
| import org.jetbrains.annotations.Nullable; |
| |
| public abstract class CachingSimpleNode extends SimpleNode { |
| |
| SimpleNode[] myChildren; |
| |
| protected CachingSimpleNode(SimpleNode aParent) { |
| super(aParent); |
| } |
| |
| protected CachingSimpleNode(Project aProject, @Nullable NodeDescriptor aParentDescriptor) { |
| super(aProject, aParentDescriptor); |
| } |
| |
| public final SimpleNode[] getChildren() { |
| if (myChildren == null) { |
| myChildren = buildChildren(); |
| onChildrenBuilt(); |
| } |
| |
| return myChildren; |
| } |
| |
| protected void onChildrenBuilt() { |
| } |
| |
| protected abstract SimpleNode[] buildChildren(); |
| |
| public void cleanUpCache() { |
| myChildren = null; |
| } |
| |
| @Nullable |
| protected SimpleNode[] getCached() { |
| return myChildren; |
| } |
| |
| } |