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Java Object Document Mapper for MongoDB
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package org.mongodb.morphia.converters;
import org.mongodb.morphia.mapping.MappedField;
import org.mongodb.morphia.mapping.MappingException;
/**
* @author Uwe Schaefer, ([email protected])
* @author scotthernandez
*/
public class CharacterConverter extends TypeConverter implements SimpleValueConverter {
/**
* Creates the Converter.
*/
public CharacterConverter() {
super(char.class, Character.class);
}
@Override
public Object decode(final Class targetClass, final Object fromDBObject, final MappedField optionalExtraInfo) {
if (fromDBObject == null) {
return null;
}
if (fromDBObject instanceof String) {
final char[] chars = ((String) fromDBObject).toCharArray();
if (chars.length == 1) {
return chars[0];
} else if (chars.length == 0) {
return (char) 0;
}
}
throw new MappingException("Trying to map multi-character data to a single character: " + fromDBObject);
}
@Override
public Object encode(final Object value, final MappedField optionalExtraInfo) {
return value == null || value.equals('\0') ? null : String.valueOf(value);
}
}