/*
* 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.openapi.util;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* @author cdr
*/
public interface UserDataHolderEx extends UserDataHolder {
/**
* @return written value
*/
@NotNull
<T> T putUserDataIfAbsent(@NotNull Key<T> key, @NotNull T value);
/**
* Replaces (atomically) old value in the map with the new one
* @return true if old value got replaced, false otherwise
* @see java.util.concurrent.ConcurrentMap#replace(Object, Object, Object)
*/
<T> boolean replace(@NotNull Key<T> key, @Nullable T oldValue, @Nullable T newValue);
}