org.springframework.cloud.gcp.data.datastore.core.convert.EntityPropertyValueProvider Maven / Gradle / Ivy
/*
* Copyright 2017-2018 the original 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
*
* https://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.springframework.cloud.gcp.data.datastore.core.convert;
import com.google.cloud.datastore.BaseEntity;
import org.springframework.cloud.gcp.data.datastore.core.mapping.DatastoreDataException;
import org.springframework.cloud.gcp.data.datastore.core.mapping.DatastorePersistentProperty;
import org.springframework.cloud.gcp.data.datastore.core.mapping.EmbeddedType;
import org.springframework.core.convert.ConversionException;
import org.springframework.data.mapping.model.PropertyValueProvider;
import org.springframework.data.util.TypeInformation;
/**
* A {@link PropertyValueProvider} for Datastore entities.
*
* @author Dmitry Solomakha
* @author Chengyuan Zhao
*
* @since 1.1
*/
public class EntityPropertyValueProvider implements PropertyValueProvider {
private final BaseEntity entity;
private final ReadWriteConversions conversion;
public EntityPropertyValueProvider(BaseEntity entity, ReadWriteConversions readWriteConversions) {
if (entity == null) {
throw new DatastoreDataException("A non-null entity is required");
}
this.entity = entity;
this.conversion = readWriteConversions;
}
@Override
public T getPropertyValue(DatastorePersistentProperty persistentProperty) {
if (persistentProperty.isIdProperty()) {
return this.conversion.convertOnRead(this.entity.getKey(), EmbeddedType.NOT_EMBEDDED,
persistentProperty.getTypeInformation());
}
else if (!persistentProperty.isColumnBacked()) {
return null;
}
return getPropertyValue(persistentProperty.getFieldName(),
persistentProperty.getEmbeddedType(),
persistentProperty.getTypeInformation());
}
@SuppressWarnings("unchecked")
public T getPropertyValue(String fieldName, EmbeddedType embeddedType, TypeInformation targetTypeInformation) {
if (!this.entity.contains(fieldName)) {
return null;
}
try {
return this.conversion.convertOnRead(this.entity.getValue(fieldName).get(),
embeddedType, targetTypeInformation);
}
catch (ConversionException | DatastoreDataException ex) {
throw new DatastoreDataException("Unable to read property " + fieldName, ex);
}
}
}