/*
* Copyright 2013 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.typeHandling.coreTypes;
import com.google.common.collect.Maps;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.terasology.reflection.metadata.FieldMetadata;
import org.terasology.engine.module.UriUtil;
import org.terasology.persistence.typeHandling.DeserializationContext;
import org.terasology.persistence.typeHandling.PersistedData;
import org.terasology.persistence.typeHandling.SerializationContext;
import org.terasology.persistence.typeHandling.SimpleTypeHandler;
import org.terasology.persistence.typeHandling.TypeHandler;
import java.util.Map;
/**
* @author Immortius <immortius@gmail.com>
*/
public class MappedContainerTypeHandler<T> extends SimpleTypeHandler<T> {
private static final Logger logger = LoggerFactory.getLogger(MappedContainerTypeHandler.class);
private Map<String, FieldMetadata<T, ?>> fieldByName = Maps.newHashMap();
private Map<FieldMetadata<T, ?>, TypeHandler<?>> mappedFields;
private Class<T> clazz;
public MappedContainerTypeHandler(Class<T> clazz, Map<FieldMetadata<T, ?>, TypeHandler<?>> mappedFields) {
this.clazz = clazz;
this.mappedFields = mappedFields;
for (FieldMetadata<T, ?> field : mappedFields.keySet()) {
this.fieldByName.put(UriUtil.normalise(field.getName()), field);
}
}
@Override
public PersistedData serialize(T value, SerializationContext context) {
if (value == null) {
return context.createNull();
}
Map<String, PersistedData> mappedData = Maps.newLinkedHashMap();
for (Map.Entry<FieldMetadata<T, ?>, TypeHandler<?>> entry : mappedFields.entrySet()) {
Object val = entry.getKey().getValue(value);
if (val != null) {
TypeHandler handler = entry.getValue();
PersistedData fieldValue = handler.serialize(val, context);
if (fieldValue != null) {
mappedData.put(entry.getKey().getName(), fieldValue);
}
}
}
return context.create(mappedData);
}
@Override
public T deserialize(PersistedData data, DeserializationContext context) {
try {
T result = clazz.newInstance();
for (Map.Entry<String, PersistedData> entry : data.getAsValueMap().entrySet()) {
FieldMetadata fieldInfo = fieldByName.get(UriUtil.normalise(entry.getKey()));
if (fieldInfo != null) {
TypeHandler handler = mappedFields.get(fieldInfo);
Object val = handler.deserialize(entry.getValue(), context);
fieldInfo.setValue(result, val);
}
}
return result;
} catch (Exception e) {
logger.error("Unable to deserialize {}", data, e);
}
return null;
}
}