Michael Bayne
a9720fd905
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3099 542714f4-19e9-0310-aa3c-eee0fc999fb1
112 lines
3.4 KiB
Java
112 lines
3.4 KiB
Java
//
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// $Id: EntryRemovedEvent.java,v 1.17 2004/08/27 02:20:20 mdb Exp $
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//
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// Narya library - tools for developing networked games
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// Copyright (C) 2002-2004 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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/**
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* An entry removed event is dispatched when an entry is removed from a
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* {@link DSet} attribute of a distributed object. It can also be
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* constructed to request the removal of an entry from a set and posted to
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* the dobjmgr.
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*
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* @see DObjectManager#postEvent
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*/
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public class EntryRemovedEvent 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
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* with the supplied set 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
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* remove an entry.
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* @param name the name of the attribute from which to remove the
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* 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,
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DSet.Entry 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
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* unserialization from the 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 (Comparable)_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 DSet.Entry getOldEntry ()
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{
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return _oldEntry;
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}
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/**
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* Applies this event to the object.
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*/
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public boolean applyToObject (DObject target)
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throws ObjectAccessException
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{
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if (_oldEntry == UNSET_OLD_ENTRY) {
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DSet set = (DSet)target.getAttribute(_name);
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// fetch the previous value for interested callers
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_oldEntry = set.get(_key);
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// remove it from the set
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set.removeKey(_key);
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}
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return true;
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}
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// documentation inherited
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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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((SetListener)listener).entryRemoved(this);
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}
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}
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// documentation inherited
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protected void toString (StringBuffer 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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protected transient DSet.Entry _oldEntry = UNSET_OLD_ENTRY;
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}
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