Interface ItemConverter
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public interface ItemConverter
The concrete realization of a strategy for converting between Java objects and DynamoDB AttributeValues. Typically created by aConversionSchema
.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description Map<String,AttributeValue>
convert(Object value)
Converts an appropriately-annotated POJO into a Map of AttributeValues.AttributeValue
convert(Method getter, Object value)
Converts a Java object into a DynamoDB AttributeValue.DynamoDBMapperFieldModel
getFieldModel(Method getter)
Returns the metadata (e.g. name, type) of the DynamoDB attribute that the return value of the given getter will be converted to.<T> T
unconvert(Class<T> clazz, Map<String,AttributeValue> values)
Reverses theconvert(Object)
method, turning a map of attribute values back into a POJO of the given class.Object
unconvert(Method getter, Method setter, AttributeValue value)
Reverses theconvert(Method, Object)
method, turning a DynamoDB AttributeValue back into a Java object suitable for passing to the given setter.
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Method Detail
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getFieldModel
DynamoDBMapperFieldModel getFieldModel(Method getter)
Returns the metadata (e.g. name, type) of the DynamoDB attribute that the return value of the given getter will be converted to.- Parameters:
getter
- the getter method to inspect- Returns:
- the metadata of the DynamoDB attribute that the result of the getter will be converted to
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convert
AttributeValue convert(Method getter, Object value)
Converts a Java object into a DynamoDB AttributeValue. Potentially able to handle both scalar and complex types.- Parameters:
getter
- the getter that returned the value to be convertedvalue
- the value to be converted- Returns:
- the converted AttributeValue
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convert
Map<String,AttributeValue> convert(Object value)
Converts an appropriately-annotated POJO into a Map of AttributeValues.- Parameters:
value
- the POJO to convert- Returns:
- the resulting map of attribute values
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unconvert
Object unconvert(Method getter, Method setter, AttributeValue value)
Reverses theconvert(Method, Object)
method, turning a DynamoDB AttributeValue back into a Java object suitable for passing to the given setter.- Parameters:
getter
- the getter for the value to be unconvertedsetter
- the setter for the value to be unconvertedvalue
- the attribute value to be unconverted- Returns:
- the unconverted Java object
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unconvert
<T> T unconvert(Class<T> clazz, Map<String,AttributeValue> values)
Reverses theconvert(Object)
method, turning a map of attribute values back into a POJO of the given class.- Type Parameters:
T
- the compile-time type of the object to create- Parameters:
clazz
- the runtime type of the object to createvalues
- the the map of attribute values to unconvert- Returns:
- the unconverted POJO
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