/*
* Copyright 2014 MovingBlocks
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.terasology.persistence.internal;
import org.terasology.entitySystem.entity.EntityRef;
import org.terasology.reflection.copy.CopyStrategy;
/**
* This copy strategy return {@link DelayedEntityRef}s for persistent entities that exists.
* For non persistent entities or entities that do no longer exist it returns {@link EntityRef#NULL}.
*
*/
class DelayedEntityRefCopyStrategy implements CopyStrategy<EntityRef> {
private DelayedEntityRefFactory delayedEntityRefFactory;
DelayedEntityRefCopyStrategy(DelayedEntityRefFactory delayedEntityRefFactory) {
this.delayedEntityRefFactory = delayedEntityRefFactory;
}
@Override
public EntityRef copy(EntityRef value) {
if (value != null) {
if (value.exists() && value.isPersistent()) {
return delayedEntityRefFactory.createDelayedEntityRef(value.getId());
} else {
return EntityRef.NULL;
}
} else {
return null;
}
}
}