| /* Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 java.nio.channels.spi; |
| |
| import java.nio.channels.SelectionKey; |
| |
| /** |
| * {@code AbstractSelectionKey} is the base implementation class for selection keys. |
| * It implements validation and cancellation methods. |
| */ |
| public abstract class AbstractSelectionKey extends SelectionKey { |
| |
| /* |
| * package private for deregister method in AbstractSelector. |
| */ |
| boolean isValid = true; |
| |
| /** |
| * Constructs a new {@code AbstractSelectionKey}. |
| */ |
| protected AbstractSelectionKey() { |
| super(); |
| } |
| |
| /** |
| * Indicates whether this key is valid. A key is valid as long as it has not |
| * been canceled. |
| * |
| * @return {@code true} if this key has not been canceled, {@code false} |
| * otherwise. |
| */ |
| @Override |
| public final boolean isValid() { |
| return isValid; |
| } |
| |
| /** |
| * Cancels this key. |
| * <p> |
| * A key that has been canceled is no longer valid. Calling this method on |
| * an already canceled key does nothing. |
| */ |
| @Override |
| public final void cancel() { |
| if (isValid) { |
| isValid = false; |
| ((AbstractSelector) selector()).cancel(this); |
| } |
| } |
| } |