org.dizitart.no2.mapper.AbstractMapper Maven / Gradle / Ivy
/*
*
* Copyright 2017-2018 Nitrite author or authors.
*
* 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.dizitart.no2.mapper;
import org.dizitart.no2.Document;
import static org.dizitart.no2.util.ObjectUtils.newInstance;
/**
* This class provides a skeletal implementation of a {@link NitriteMapper}.
* If an object implements a {@link Mappable} interface, it will use that
* implementation to generate a {@link Document}, otherwise it will use
* vendor specific serializer implementation.
*
* @author Anindya Chatterjee
* @since 2.0
*/
public abstract class AbstractMapper implements NitriteMapper {
/**
* A child class must override this method for vendor specific
* serialization.
*
* @param the type parameter
* @param object the object
* @return the document
*/
protected abstract Document asDocumentInternal(T object);
/**
* A child class must override this method for vendor specific
* de-serialization.
*
* @param the type parameter
* @param document the document
* @param type the type
* @return the de-serialized object
*/
protected abstract T asObjectInternal(Document document, Class type);
@Override
public Document asDocument(T object) {
if (object instanceof Mappable) {
Mappable mappable = (Mappable) object;
return mappable.write(this);
}
return asDocumentInternal(object);
}
@Override
public T asObject(Document document, Class type) {
if (Mappable.class.isAssignableFrom(type)) {
T item = newInstance(type);
if (item != null) {
((Mappable) item).read(this, document);
}
return item;
}
return asObjectInternal(document, type);
}
}