author | alanb |
Mon, 09 May 2011 18:45:33 +0100 | |
changeset 9679 | d98ae8bc45fc |
parent 5506 | 202f599c92aa |
child 14342 | 8435a30053c1 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2009, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.nio.file; |
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import java.io.IOException; |
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/** |
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* An object that may be registered with a watch service so that it can be |
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* <em>watched</em> for changes and events. |
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* |
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* <p> This interface defines the {@link #register register} method to register |
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* the object with a {@link WatchService} returning a {@link WatchKey} to |
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* represent the registration. An object may be registered with more than one |
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* watch service. Registration with a watch service is cancelled by invoking the |
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* key's {@link WatchKey#cancel cancel} method. |
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* |
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* @since 1.7 |
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* |
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* @see Path#register |
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*/ |
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public interface Watchable { |
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/** |
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* Registers an object with a watch service. |
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* |
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* <p> If the file system object identified by this object is currently |
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* registered with the watch service then the watch key, representing that |
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* registration, is returned after changing the event set or modifiers to |
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* those specified by the {@code events} and {@code modifiers} parameters. |
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* Changing the event set does not cause pending events for the object to be |
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* discarded. Objects are automatically registered for the {@link |
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* StandardWatchEventKinds#OVERFLOW OVERFLOW} event. This event is not |
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* required to be present in the array of events. |
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* |
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* <p> Otherwise the file system object has not yet been registered with the |
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* given watch service, so it is registered and the resulting new key is |
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* returned. |
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* |
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* <p> Implementations of this interface should specify the events they |
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* support. |
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* |
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* @param watcher |
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* the watch service to which this object is to be registered |
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* @param events |
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* the events for which this object should be registered |
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* @param modifiers |
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* the modifiers, if any, that modify how the object is registered |
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* |
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* @return a key representing the registration of this object with the |
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* given watch service |
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* |
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* @throws UnsupportedOperationException |
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* if unsupported events or modifiers are specified |
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* @throws IllegalArgumentException |
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* if an invalid of combination of events are modifiers are specified |
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* @throws ClosedWatchServiceException |
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* if the watch service is closed |
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* @throws IOException |
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* if an I/O error occurs |
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* @throws SecurityException |
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* if a security manager is installed and it denies an unspecified |
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* permission required to monitor this object. Implementations of |
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* this interface should specify the permission checks. |
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*/ |
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WatchKey register(WatchService watcher, |
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WatchEvent.Kind<?>[] events, |
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WatchEvent.Modifier... modifiers) |
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throws IOException; |
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/** |
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* Registers an object with a watch service. |
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* |
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* <p> An invocation of this method behaves in exactly the same way as the |
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* invocation |
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* <pre> |
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* watchable.{@link #register(WatchService,WatchEvent.Kind[],WatchEvent.Modifier[]) register}(watcher, events, new WatchEvent.Modifier[0]); |
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* </pre> |
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* |
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* @param watcher |
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* the watch service to which this object is to be registered |
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* @param events |
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* the events for which this object should be registered |
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* |
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* @return a key representing the registration of this object with the |
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* given watch service |
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* |
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* @throws UnsupportedOperationException |
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* if unsupported events are specified |
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* @throws IllegalArgumentException |
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* if an invalid of combination of events are specified |
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* @throws ClosedWatchServiceException |
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* if the watch service is closed |
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* @throws IOException |
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* if an I/O error occurs |
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* @throws SecurityException |
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* if a security manager is installed and it denies an unspecified |
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* permission required to monitor this object. Implementations of |
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* this interface should specify the permission checks. |
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*/ |
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WatchKey register(WatchService watcher, WatchEvent.Kind<?>... events) |
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throws IOException; |
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} |