de.terrestris.shoguncore.converter.PropertyValueConverter Maven / Gradle / Ivy
/**
*
*/
package de.terrestris.shoguncore.converter;
import org.apache.commons.lang3.math.NumberUtils;
import javax.persistence.AttributeConverter;
/**
* This converter can be used for the values of the type Map.
*
* The values of the map will be converted to strings to persist them in a
* string column in the database. A string value coming from the database will
* be converted to the best matching Java type.
*
* Currently {@link String}, {@link Long}, {@link Double} and {@link Boolean}
* values are supported.
*
* @author Nils Bühner
*/
public class PropertyValueConverter implements AttributeConverter {
/**
* Converts an arbitrary object to it's string representation, that will be
* stored in the database.
*/
@Override
public String convertToDatabaseColumn(Object attribute) {
return attribute.toString();
}
/**
* Converts a string value from the database to the best matching java
* primitive type.
*/
@Override
public Object convertToEntityAttribute(String dbData) {
if ("true".equalsIgnoreCase(dbData)) {
return true;
} else if ("false".equalsIgnoreCase(dbData)) {
return false;
} else if (NumberUtils.isParsable(dbData)) {
if (NumberUtils.isDigits(dbData) ||
(dbData.startsWith("-") &&
NumberUtils.isDigits(dbData.substring(1)))) {
return Long.parseLong(dbData);
} else {
return Double.parseDouble(dbData);
}
}
return dbData;
}
}