/*
* Copyright 2008-2009 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package org.visage.runtime.sequence;
import org.visage.runtime.TypeInfo;
/**
* Represents a sequence with a single element. Singleton sequences should be created with the Sequences.singleton()
* factory, not the SingletonSequence constructor. O(1) space and time construction costs.
*
* @author Brian Goetz
*/
class SingletonSequence<T> extends AbstractSequence<T> {
private final T value;
public SingletonSequence(TypeInfo<T> ti, T value) {
super(ti);
this.value = value;
}
@Override
public int size() {
return 1;
}
@Override
public T get(int position) {
if (position == 0)
return value;
else
return getDefaultValue();
}
}