| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * 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 |
| * |
| * hcodep://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.onosproject.store.service; |
| |
| /** |
| * Transactional Set data structure. |
| * <p> |
| * A TransactionalSet is implemented with the help of TransactionalMap data structure. |
| * All operations performed on this set within a transaction boundary are invisible externally |
| * until the point when the transaction commits. A commit usually succeeds in the absence of conflicts. |
| * |
| * @param <E> type of element. |
| */ |
| public interface TransactionalSet<E> { |
| |
| /** |
| * Adds the specified element to this set if it is not already present |
| * (optional operation). More formally, adds the specified element |
| * <code>e</code> to this set if the set contains no element <code>e2</code> |
| * such that |
| * <code>(e==null ? e2==null : e.equals(e2))</code>. |
| * If this set already contains the element, the call leaves the set |
| * unchanged and returns <code>false</code>. In combination with the |
| * restriction on constructors, this ensures that sets never contain |
| * duplicate elements. |
| * |
| * @param e element to be added to this set |
| * @return <code>true</code> if this set did not already contain the specified |
| * element |
| */ |
| boolean add(E e); |
| |
| /** |
| * Removes the specified element from this set if it is present |
| * (optional operation). More formally, removes an element <code>e</code> |
| * such that |
| * <code>(o==null ? e==null : o.equals(e))</code>, if |
| * this set contains such an element. Returns <code>true</code> if this set |
| * contained the element (or equivalently, if this set changed as a |
| * result of the call). (This set will not contain the element once the |
| * call returns.) |
| * |
| * @param e element to be removed to this set |
| * @return <code>true</code> if this set contained the specified element |
| */ |
| boolean remove(E e); |
| |
| /** |
| * Returns <code>true</code> if this set contains the specified element. |
| * More formally, returns <code>true</code> if and only if this set |
| * contains an element <code>e</code> such that |
| * <code>(o==null ? e==null : o.equals(e))</code>. |
| * |
| * @param e element whose presence in this set is to be tested |
| * @return <code>true</code> if this set contains the specified element |
| * @throws ClassCastException if the type of the specified element |
| * is incompatible with this set |
| * @throws NullPointerException if the specified element is null and this |
| * set does not permit null elements |
| */ |
| boolean contains(E e); |
| } |