Lazy values unified in the project

2013-10-01 21:23:24 +04:00
parent 9064cbd664
commit 9bb77b09a3
10 changed files with 48 additions and 132 deletions
@@ -1,61 +0,0 @@
-/*
- * Copyright 2010-2013 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 org.jetbrains.jet.utils;
-
-public abstract class RecursionIntolerantLazyValue<T> {
-
-    private enum State {
-        NOT_COMPUTED,
-        BEING_COMPUTED,
-        COMPUTED,
-        ERROR
-    }
-
-    private State state = State.NOT_COMPUTED;
-    private T value;
-
-    protected abstract T compute();
-
-    protected T getValueOnErrorReentry() {
-        throw new ReenteringLazyValueComputationException();
-    }
-
-    public boolean isComputed() {
-        return state == State.ERROR || state == State.COMPUTED;
-    }
-
-    public final T get() {
-        switch (state) {
-            case NOT_COMPUTED:
-                state = State.BEING_COMPUTED;
-                value = compute();
-                state = State.COMPUTED;
-                return value;
-            case BEING_COMPUTED:
-                state = State.ERROR;
-                throw new ReenteringLazyValueComputationException();
-            case COMPUTED:
-                return value;
-            case ERROR:
-                return getValueOnErrorReentry();
-        }
-        throw new IllegalStateException("Unreachable");
-    }
-
-
-
-}