/**
* 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.util;
/**
* A read-write interface to a set of elements.
*
* This is used in favor of using a standard Java collections interface so that
* Javascript-optimized implementations can be used in GWT code.
*
* Consistent with {@link ReadableIdentitySet}, null is not permitted as a
* value. All methods will reject null values.
*
*/
public interface IdentitySet<T> extends ReadableIdentitySet<T> {
/**
* Adds that an element to this set it is it not already present. Otherwise,
* does nothing.
*
* @param s element to add
*/
void add(T s);
/**
* Removes an element from this set if it is present. Otherwise, does nothing.
*
* @param s element to remove
*/
void remove(T s);
/**
* Removes all elements from this set.
*/
void clear();
}