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The Trove library provides high speed regular and primitive collections for Java.

There is a newer version: 3.0.3

// ////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2009, Rob Eden All Rights Reserved.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// ////////////////////////////////////////////////////////////////////////////

package gnu.trove.impl.sync;

import java.util.Set;


/** Local implementation of SynchronizedSet so we can set the mutex explicitly. */
class SynchronizedSet extends SynchronizedCollection implements Set {
	private static final long serialVersionUID = 487447009682186044L;

	SynchronizedSet( Set s, Object mutex ) { super( s, mutex ); }
	public boolean equals( Object o ) { synchronized( mutex ) { return c.equals( o ); } }
	public int hashCode() { synchronized( mutex ) { return c.hashCode(); } }
}