/**
* Copyright 2009 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.model.adt;
/**
* Encapsulates a value that can be set and can be read, but whose value only
* ever increases, as defined by {@link Comparable#compareTo(Object)}.
*
* The value may never be set to null, but may be null initially.
*
*/
public interface MonotonicValue<C extends Comparable<C>> {
/**
* @return current value.
*/
C get();
/**
* Sets this value. If the current value is equal or greater (as defined by
* {@link Comparable#compareTo(Object)}), this method has no effect.
*
* @param value new value, must not be null
*/
void set(C value);
}