| /* |
| * Copyright 2000-2013 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 com.intellij.reference; |
| |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.lang.ref.SoftReference; |
| |
| /** |
| * @author Dmitry Avdeev |
| * @since 25.05.2012 |
| */ |
| public abstract class SoftLazyValue<T> { |
| private SoftReference<T> myReference; |
| |
| public T getValue() { |
| T t = com.intellij.reference.SoftReference.dereference(myReference); |
| if (t == null) { |
| t = compute(); |
| myReference = new SoftReference<T>(t); |
| } |
| return t; |
| } |
| |
| @NotNull |
| protected abstract T compute(); |
| } |