/**
* Copyright (C) 2009-2010 Wilfred Springer
*
* This file is part of Preon.
*
* Preon 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; either version 2, or (at your option) any later version.
*
* Preon 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
* Preon; see the file COPYING. If not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Linking this library statically or dynamically with other modules is making a
* combined work based on this library. Thus, the terms and conditions of the
* GNU General Public License cover the whole combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent modules, and
* to copy and distribute the resulting executable under terms of your choice,
* provided that you also meet, for each linked independent module, the terms
* and conditions of the license of that module. An independent module is a
* module which is not derived from or based on this library. If you modify this
* library, you may extend this exception to your version of the library, but
* you are not obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package org.codehaus.preon.codec;
import org.codehaus.preon.Codec;
import org.codehaus.preon.CodecFactory;
import org.codehaus.preon.ResolverContext;
import org.codehaus.preon.annotation.BoundList;
import org.codehaus.preon.annotation.Choices;
import java.lang.reflect.AnnotatedElement;
import java.util.List;
import java.util.Map;
public class MapCodecFactory implements CodecFactory {
private final CodecFactory codecFactory;
public MapCodecFactory(CodecFactory codecFactory) {
this.codecFactory = codecFactory;
}
public <T> Codec<T> create(AnnotatedElement metadata, Class<T> type, ResolverContext context) {
if (Map.class.isAssignableFrom(type)) {
BoundList boundList = metadata.getAnnotation(BoundList.class);
if (boundList != null && typeIsGuaranteedToBeEntry(boundList)) {
Codec<List> listCodec =
codecFactory.create(metadata, List.class, context);
if (listCodec != null) {
return new ListBasedMapCodec(listCodec);
} else {
return null;
}
}
}
return null;
}
private boolean typeIsGuaranteedToBeEntry(BoundList boundList) {
if (boundList.type() != null && Map.Entry.class.isAssignableFrom(boundList.type())) {
return true;
} else if (boundList.types() != null && boundList.types().length > 0) {
boolean allGood = true;
for (Class<?> type : boundList.types()) {
allGood &= (type != null && Map.Entry.class.isAssignableFrom(type));
}
return allGood;
} else if (boundList.selectFrom() != null && boundList.selectFrom().alternatives().length > 0) {
boolean allGood = true;
for (Choices.Choice choice : boundList.selectFrom().alternatives()) {
allGood &= (choice != null && Map.Entry.class.isAssignableFrom(choice.type()));
}
return allGood;
}
return false;
}
}