software.amazon.awssdk.enhanced.dynamodb.internal.document

Class DefaultEnhancedDocument

java.lang.Object

software.amazon.awssdk.enhanced.dynamodb.internal.document.DefaultEnhancedDocument

All Implemented Interfaces:

EnhancedDocument

@Immutable
public class DefaultEnhancedDocument
extends Object
implements EnhancedDocument

Default implementation of EnhancedDocument used by the SDK to create Enhanced Documents. Attributes are initially saved as a String-Object Map when documents are created using the builder. Conversion to an AttributeValueMap is done lazily when values are accessed. When the document is retrieved from DynamoDB, the AttributeValueMap is internally saved as the attribute value map. Custom objects or collections are saved in the enhancedTypeMap to preserve the generic class information. Note that no default ConverterProviders are assigned, so ConverterProviders must be passed in the builder when creating enhanced documents.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DefaultEnhancedDocument.DefaultBuilder

Nested classes/interfaces inherited from interface software.amazon.awssdk.enhanced.dynamodb.document.EnhancedDocument

EnhancedDocument.Builder

Constructor Summary

Constructors

Constructor and Description
DefaultEnhancedDocument(DefaultEnhancedDocument.DefaultBuilder builder)

Method Summary

Modifier and Type	Method and Description
List<AttributeConverterProvider>	attributeConverterProviders()
static EnhancedDocument.Builder	builder() Creates a default builder for EnhancedDocument.
static <T> AttributeConverter<T>	converterForClass(EnhancedType<T> type, ChainConverterProvider chainConverterProvider)
boolean	equals(Object o)
<T> T	get(String attributeName, Class<T> clazz) Returns the value of the specified attribute in the current document as a specified class type; or null if the attribute either doesn't exist or the attribute value is null.
<T> T	get(String attributeName, EnhancedType<T> type) Returns the value of the specified attribute in the current document as a specified EnhancedType; or null if the attribute either doesn't exist or the attribute value is null.
Boolean	getBoolean(String attributeName) Gets the Boolean value for the specified attribute.
SdkBytes	getBytes(String attributeName) Gets the SdkBytes value of specified attribute in the document.
Set<SdkBytes>	getBytesSet(String attributeName) Gets the Set of String values of the given attribute in the current document.
String	getJson(String attributeName) Gets the JSON document value of the specified attribute.
<T> List<T>	getList(String attributeName, EnhancedType<T> type) Gets the List of values of type T for the given attribute in the current document.
List<AttributeValue>	getListOfUnknownType(String attributeName) Retrieves a list of AttributeValue objects for a specified attribute in a document.
<K,V> Map<K,V>	getMap(String attributeName, EnhancedType<K> keyType, EnhancedType<V> valueType) Returns a map of a specific Key-type and Value-type based on the given attribute name, key type, and value type.
Map<String,AttributeValue>	getMapOfUnknownType(String attributeName) Retrieves a Map with String keys and corresponding AttributeValue objects as values for a specified attribute in a document.
SdkNumber	getNumber(String attributeName) Gets the SdkNumber value of specified attribute in the document.
Set<SdkNumber>	getNumberSet(String attributeName) Gets the Set of String values of the given attribute in the current document.
String	getString(String attributeName) Gets the String value of specified attribute in the document.
Set<String>	getStringSet(String attributeName) Gets the Set of String values of the given attribute in the current document.
int	hashCode()
boolean	isNull(String attributeName) Checks if the document is a null value.
boolean	isPresent(String attributeName) Checks if the attribute exists in the document.
EnhancedDocument.Builder	toBuilder() Converts an existing EnhancedDocument into a builder object that can be used to modify its values and then create a new EnhancedDocument.
String	toJson()
Map<String,AttributeValue>	toMap() This method converts a document into a key-value map with the keys as String objects and the values as AttributeValue objects.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface software.amazon.awssdk.enhanced.dynamodb.document.EnhancedDocument

fromAttributeValueMap, fromJson

Constructor Detail

DefaultEnhancedDocument

public DefaultEnhancedDocument(DefaultEnhancedDocument.DefaultBuilder builder)

Method Detail

builder

public static EnhancedDocument.Builder builder()

Description copied from interface: EnhancedDocument

Creates a default builder for EnhancedDocument.

Specified by:

builder in interface EnhancedDocument

converterForClass

public static <T> AttributeConverter<T> converterForClass(EnhancedType<T> type,
                                                          ChainConverterProvider chainConverterProvider)

toBuilder

public EnhancedDocument.Builder toBuilder()

Description copied from interface: EnhancedDocument

Converts an existing EnhancedDocument into a builder object that can be used to modify its values and then create a new EnhancedDocument.

Specified by:

toBuilder in interface EnhancedDocument

Returns:

A EnhancedDocument.Builder initialized with the values of this EnhancedDocument.

attributeConverterProviders

public List<AttributeConverterProvider> attributeConverterProviders()

Specified by:

attributeConverterProviders in interface EnhancedDocument

Returns:

List of AttributeConverterProvider defined for the given Document.

isNull

public boolean isNull(String attributeName)

Description copied from interface: EnhancedDocument

Checks if the document is a null value.

Specified by:

isNull in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute that needs to be checked.

Returns:

true if the specified attribute exists with a null value; false otherwise.

isPresent

public boolean isPresent(String attributeName)

Description copied from interface: EnhancedDocument

Checks if the attribute exists in the document.

Specified by:

isPresent in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute that needs to be checked.

Returns:

true if the specified attribute exists with a null/non-null value; false otherwise.

get

public <T> T get(String attributeName,
                 EnhancedType<T> type)

Description copied from interface: EnhancedDocument

Returns the value of the specified attribute in the current document as a specified EnhancedType; or null if the attribute either doesn't exist or the attribute value is null.

Retrieving String Type for a document Retrieving Custom Type for which Convertor Provider was defined while creating the document Retrieving list of strings in a document Retrieving a Map with List of strings in its values

Specified by:

get in interface EnhancedDocument

Type Parameters:

T - The type of the attribute value.

Parameters:

attributeName - Name of the attribute.

type - EnhancedType of the value

Returns:

Attribute value of type T }

getString

public String getString(String attributeName)

Description copied from interface: EnhancedDocument

Gets the String value of specified attribute in the document.

Specified by:

getString in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute.

Returns:

value of the specified attribute in the current document as a string; or null if the attribute either doesn't exist or the attribute value is null

getNumber

public SdkNumber getNumber(String attributeName)

Description copied from interface: EnhancedDocument

Gets the SdkNumber value of specified attribute in the document.

Specified by:

getNumber in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute.

Returns:

value of the specified attribute in the current document as a number; or null if the attribute either doesn't exist or the attribute value is null

get

public <T> T get(String attributeName,
                 Class<T> clazz)

Description copied from interface: EnhancedDocument

Returns the value of the specified attribute in the current document as a specified class type; or null if the attribute either doesn't exist or the attribute value is null.

Retrieving String Type for a document Retrieving Custom Type for which Convertor Provider was defined while creating the document

Note : This API should not be used to retrieve values of List and Map types. Instead, getList and getMap APIs should be used to retrieve attributes of type List and Map, respectively.

Specified by:

get in interface EnhancedDocument

Type Parameters:

T - The type of the attribute value.

Parameters:

attributeName - Name of the attribute.

clazz - Class type of value.

Returns:

Attribute value of type T }

getBytes

public SdkBytes getBytes(String attributeName)

Description copied from interface: EnhancedDocument

Gets the SdkBytes value of specified attribute in the document.

Specified by:

getBytes in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute.

Returns:

the value of the specified attribute in the current document as SdkBytes; or null if the attribute either doesn't exist or the attribute value is null.

getStringSet

public Set<String> getStringSet(String attributeName)

Description copied from interface: EnhancedDocument

Gets the Set of String values of the given attribute in the current document.

Specified by:

getStringSet in interface EnhancedDocument

Parameters:

attributeName - the name of the attribute.

Returns:

the value of the specified attribute in the current document as a set of strings; or null if the attribute either does not exist or the attribute value is null.

getNumberSet

public Set<SdkNumber> getNumberSet(String attributeName)

Description copied from interface: EnhancedDocument

Gets the Set of String values of the given attribute in the current document.

Specified by:

getNumberSet in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute.

Returns:

value of the specified attribute in the current document as a set of SdkNumber; or null if the attribute either doesn't exist or the attribute value is null.

getBytesSet

public Set<SdkBytes> getBytesSet(String attributeName)

Description copied from interface: EnhancedDocument

Gets the Set of String values of the given attribute in the current document.

Specified by:

getBytesSet in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute.

Returns:

value of the specified attribute in the current document as a set of SdkBytes; or null if the attribute doesn't exist.

getList

public <T> List<T> getList(String attributeName,
                           EnhancedType<T> type)

Description copied from interface: EnhancedDocument

Gets the List of values of type T for the given attribute in the current document.

Specified by:

getList in interface EnhancedDocument

Type Parameters:

T - Type T of List elements

Parameters:

attributeName - Name of the attribute.

type - EnhancedType of Type T.

Returns:

value of the specified attribute in the current document as a list of type T, or null if the attribute does not exist.

getMap

public <K,V> Map<K,V> getMap(String attributeName,
                             EnhancedType<K> keyType,
                             EnhancedType<V> valueType)

Description copied from interface: EnhancedDocument

Returns a map of a specific Key-type and Value-type based on the given attribute name, key type, and value type. Example usage: When getting an attribute as a map of UUID keys and Integer values, use this API as shown below:

Specified by:

getMap in interface EnhancedDocument

Type Parameters:

K - The type of the Map keys.

V - The type of the Map values.

Parameters:

attributeName - The name of the attribute that needs to be get as Map.

keyType - Enhanced Type of Key attribute, like String, UUID etc that can be represented as String Keys.

valueType - Enhanced Type of Values , which have converters defineds in EnhancedDocument.Builder.attributeConverterProviders(AttributeConverterProvider...) for the document

Returns:

Map of type K and V with the given attribute name, key type, and value type.

getJson

public String getJson(String attributeName)

Description copied from interface: EnhancedDocument

Gets the JSON document value of the specified attribute.

Specified by:

getJson in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute.

Returns:

value of the specified attribute in the current document as a JSON string; or null if the attribute either doesn't exist or the attribute value is null.

getBoolean

public Boolean getBoolean(String attributeName)

Description copied from interface: EnhancedDocument

Gets the Boolean value for the specified attribute.

Specified by:

getBoolean in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute.

Returns:

value of the specified attribute in the current document as a Boolean representation; or null if the attribute either doesn't exist or the attribute value is null.

getListOfUnknownType

public List<AttributeValue> getListOfUnknownType(String attributeName)

Description copied from interface: EnhancedDocument

Retrieves a list of AttributeValue objects for a specified attribute in a document. This API should be used when the elements of the list are a combination of different types such as Strings, Maps, and Numbers. If all elements in the list are of a known fixed type, use EnhancedDocument.getList(String, EnhancedType) instead.

Specified by:

getListOfUnknownType in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute.

Returns:

value of the specified attribute in the current document as a List of AttributeValue

getMapOfUnknownType

public Map<String,AttributeValue> getMapOfUnknownType(String attributeName)

Description copied from interface: EnhancedDocument

Retrieves a Map with String keys and corresponding AttributeValue objects as values for a specified attribute in a document. This API is particularly useful when the values of the map are of different types such as strings, maps, and numbers. However, if all the values in the map for a given attribute key are of a known fixed type, it is recommended to use the method EnhancedDocument#getMap(String, EnhancedType, EnhancedType) instead.

Specified by:

getMapOfUnknownType in interface EnhancedDocument

Parameters:

attributeName - Name of the attribute.

Returns:

value of the specified attribute in the current document as a AttributeValue

toJson

public String toJson()

Specified by:

toJson in interface EnhancedDocument

Returns:

document as a JSON string. Note all binary data will become base-64 encoded in the resultant string.

toMap

public Map<String,AttributeValue> toMap()

Description copied from interface: EnhancedDocument

This method converts a document into a key-value map with the keys as String objects and the values as AttributeValue objects. It can be particularly useful for documents with attributes of unknown types, as it allows for further processing or manipulation of the document data in a AttributeValue format.

Specified by:

toMap in interface EnhancedDocument

Returns:

Document as a String AttributeValue Key-Value Map

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object