/*
* Copyright 2003-2016 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 jetbrains.mps.nodeEditor.cells.collections;
import org.jetbrains.annotations.NotNull;
/**
* Internal interface used by {@link AbstractContainer} implementors in order to associate
* prev/next links with the actual value saved inside this container
* <p>
* User: shatalin
* Date: 10/02/16
*/
public interface Entry<T> {
/**
* @return actual value wrapped by this entry
*/
@NotNull
T getItem();
/**
* Returning next entry in the list. Return null for the last entry.
*
* @return next entry
*/
Entry<T> getNext();
/**
* Setting next entry for this one.
*/
void setNext(Entry<T> next);
/**
* Returning previous entry in the list. Return last entry for the first entry.
*
* @return previous entry
*/
Entry<T> getPrev();
/**
* Setting prev entry for this one.
*/
void setPrev(Entry<T> prev);
}