/**
* Copyright 2008 Google Inc.
*
* 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.waveprotocol.wave.client.common.util;
/**
* Wrapper for an element in a sequence
* <p>
* Implementations must enforce the contract that
* element.getNext().getPrev() == element.getPrev().getNext() == element
*
* @author danilatos@google.com (Daniel Danilatos)
* @param <T>
*/
public interface SequenceElement<T> {
/**
* @return Next element in the sequence (wraps)
*/
SequenceElement<T> getNext();
/**
* @return Previous element in the sequence (wraps)
*/
SequenceElement<T> getPrev();
/**
* @return Boxed value
*/
T value();
}