/*************************************************************************
* Copyright 2009-2014 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 java.io.Closeable;
import java.util.List;
import com.google.common.base.Optional;
import com.google.common.collect.Lists;
/**
*
*/
public class IO {
/**
* Close a closable, returning any error.
*
* @param closeable The closeable to close
* @return The optional error
*/
public static Optional<Throwable> close( final Closeable closeable ) {
Optional<Throwable> error = Optional.absent( );
if ( closeable != null ) try {
closeable.close( );
} catch ( Throwable e ) {
error = Optional.of( e );
}
return error;
}
/**
* Close given closables, return errors.
*
* @param closeables The closeables to close
* @return The error list (same length as closeables)
* @see Optional#presentInstances(Iterable)
*/
public static Iterable<Optional<Throwable>> close( final Iterable<? extends Closeable> closeables ) {
final List<Optional<Throwable>> results = Lists.newArrayList( );
if ( closeables != null ) for ( final Closeable closeable : closeables ) {
results.add( close( closeable ) );
}
return results;
}
}