Michael Bayne
725f656197
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5274 542714f4-19e9-0310-aa3c-eee0fc999fb1
123 lines
3.8 KiB
Java
123 lines
3.8 KiB
Java
//
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// $Id$
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//
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// Narya library - tools for developing networked games
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// Copyright (C) 2002-2007 Three Rings Design, Inc., All Rights Reserved
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// http://www.threerings.net/code/narya/
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.threerings.presents.dobj;
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import static com.threerings.presents.Log.log;
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/**
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* An entry removed event is dispatched when an entry is removed from a {@link DSet} attribute of a
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* distributed object. It can also be constructed to request the removal of an entry from a set and
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* posted to the dobjmgr.
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*
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* @see DObjectManager#postEvent
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*
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* @param <T> the type of entry being handled by this event. This must match the type on the set
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* that generated this event.
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*/
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public class EntryRemovedEvent<T extends DSet.Entry> extends NamedEvent
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{
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/**
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* Constructs a new entry removed event on the specified target object with the supplied set
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* attribute name and entry key to remove.
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*
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* @param targetOid the object id of the object from whose set we will remove an entry.
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* @param name the name of the attribute from which to remove the specified entry.
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* @param key the entry key that identifies the entry to remove.
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* @param oldEntry the previous value of the entry.
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*/
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public EntryRemovedEvent (int targetOid, String name, Comparable<?> key, T oldEntry)
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{
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super(targetOid, name);
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_key = key;
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_oldEntry = oldEntry;
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}
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/**
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* Constructs a blank instance of this event in preparation for unserialization from the
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* network.
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*/
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public EntryRemovedEvent ()
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{
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}
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/**
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* Returns the key that identifies the entry that has been removed.
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*/
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public Comparable<?> getKey ()
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{
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return _key;
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}
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/**
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* Returns the entry that was in the set prior to being updated.
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*/
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public T getOldEntry ()
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{
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return _oldEntry;
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}
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@Override
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public boolean alreadyApplied ()
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{
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return (_oldEntry != UNSET_OLD_ENTRY);
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}
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@Override
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public boolean applyToObject (DObject target)
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throws ObjectAccessException
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{
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if (!alreadyApplied()) {
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DSet<T> set = target.getSet(_name);
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// remove, fetch the previous value for interested callers
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_oldEntry = set.removeKey(_key);
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if (_oldEntry == null) {
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// complain if there was actually nothing there
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log.warning("No matching entry to remove [key=" + _key + ", set=" + set + "].");
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return false;
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}
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}
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return true;
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}
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@Override
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protected void notifyListener (Object listener)
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{
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if (listener instanceof SetListener) {
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@SuppressWarnings("unchecked") SetListener<T> setlist = (SetListener<T>)listener;
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setlist.entryRemoved(this);
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}
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}
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@Override
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protected void toString (StringBuilder buf)
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{
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buf.append("ELREM:");
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super.toString(buf);
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buf.append(", key=").append(_key);
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}
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protected Comparable<?> _key;
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@SuppressWarnings("unchecked")
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protected transient T _oldEntry = (T)UNSET_OLD_ENTRY;
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}
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