/*************************************************************************
* Copyright 2009-2012 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.
*
* This file may incorporate work covered under the following copyright
* and permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
*
* Redistribution and use of this software in source and binary forms,
* with or without modification, are permitted provided that the
* following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE
* THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE LICENSED MATERIAL,
* COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE,
* AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
* IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA,
* SANTA BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY,
* WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION,
* REPLACEMENT OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO
* IDENTIFIED, OR WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT
* NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS.
************************************************************************/
package com.eucalyptus.util;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ConcurrentMap;
import org.apache.log4j.Logger;
import com.eucalyptus.system.Ats;
import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
public class Composites {
private static Logger LOG = Logger.getLogger( Composites.class );
private static ConcurrentMap<Class, CompositeHelper> subTypeCache = Maps.newConcurrentMap( );
private static <T> CompositeHelper<T> build( Class<T> destType ) {
List<Class> sourceTypes = Lists.newArrayList( );
if ( !Ats.from( destType ).has( Composite.class ) ) {
sourceTypes.add( destType );
} else {
sourceTypes = Arrays.asList( Ats.from( destType ).get( Composite.class ).value( ) );
}
CompositeHelper<T> helper = null;
if ( !subTypeCache.containsKey( destType ) ) {
helper = new CompositeHelper<T>( destType, sourceTypes );
subTypeCache.putIfAbsent( destType, helper );
} else {
helper = subTypeCache.get( destType );
}
return helper;
}
public static <A,B> B updateNulls( A source, B dest ) {
return ( B ) CompositeHelper.updateNulls( source, dest );
}
public static <A,B> B update( A source, B dest ) {
return ( B ) CompositeHelper.update( source, dest );
}
public static <T> T composeNew( Class<T> destType, Object... sources ) {
T dest;
try {
dest = destType.newInstance( );
return compose( dest, sources );
} catch ( Exception e ) {
LOG.error( e, e );
throw new RuntimeException( "Composition for " + destType.getCanonicalName( ) + " failed because of " + e.getMessage( ), e );
}
}
public static <T> T compose( T dest, Object... sources ) {
CompositeHelper<T> helper = Composites.build( (Class<T>)dest.getClass( ) );
return helper.compose( dest, sources );
}
public static <A,B> B updateNew( A source, Class<B> destType ) {
try {
return ( B ) CompositeHelper.update( source, destType.newInstance( ) );
} catch ( Exception e ) {
LOG.error( e, e );
throw new RuntimeException( "Failed to update composable object because of: " + e.getMessage( ), e );
}
}
public static <T> List<Object> projectNew( T source, Class... destTypes ) {
List<Object> dests = Lists.transform( Arrays.asList( destTypes ), new Function<Class,Object>( ) {
@Override
public Object apply( Class arg0 ) {
try {
return arg0.newInstance( );
} catch ( Exception e ) {
throw new RuntimeException( e );
}
}});
return project( source, dests );
}
public static <T> List<Object> projectNew( T source ) {
try {
List<Object> dests = Lists.transform( subTypeCache.get( source ).getSourceTypes( ), new Function<Class,Object>() {
@Override
public Object apply( Class arg0 ) {
try {
return arg0.newInstance( );
} catch ( Exception e ) {
throw new RuntimeException( e );
}
}} );
return project( source, dests );
} catch ( Exception e ) {
LOG.error( e, e );
throw new RuntimeException( "Projection for " + source.getClass( ).getCanonicalName( ) + " failed because of " + e.getMessage( ), e );
}
}
public static <T> List<Object> project( T source, Object... dests ) {
CompositeHelper<T> helper = ( CompositeHelper<T> ) Composites.build( source.getClass( ) );
return helper.project( source, dests );
}
}