/*************************************************************************
* Copyright 2009-2013 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3 of the License.
*
* This program 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 General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
* CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
* additional information or have any questions.
************************************************************************/
package com.eucalyptus.util;
import javax.annotation.Nonnull;
/**
*
*/
public class Wrappers {
public static <T> T unwrap( @Nonnull Class<T> target,
@Nonnull T item ) {
T current = item;
while ( current instanceof Wrapper ) {
Object unwrapped = Wrapper.class.cast( current ).unwrap();
if ( !target.isInstance( unwrapped ) ) {
break;
}
current = target.cast( unwrapped );
}
return current;
}
public static <T> T unwrapOne( @Nonnull Class<T> target,
@Nonnull T item ) {
T current = item;
if ( current instanceof Wrapper ) {
Object unwrapped = Wrapper.class.cast( current ).unwrap();
if ( target.isInstance( unwrapped ) ) {
current = target.cast( unwrapped );
}
}
return current;
}
}