com.amazonaws.services.dynamodbv2.datamodeling.internal

Class AttributeValueMarshaller

java.lang.Object

com.amazonaws.services.dynamodbv2.datamodeling.internal.AttributeValueMarshaller

public class AttributeValueMarshaller
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static java.nio.ByteBuffer	marshall(com.amazonaws.services.dynamodbv2.model.AttributeValue attributeValue) Marshalls the data using a TLV (Tag-Length-Value) encoding.
static com.amazonaws.services.dynamodbv2.model.AttributeValue	unmarshall(java.nio.ByteBuffer plainText)

Methods inherited from class java.lang.Object

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

Method Detail

marshall

public static java.nio.ByteBuffer marshall(com.amazonaws.services.dynamodbv2.model.AttributeValue attributeValue)

Marshalls the data using a TLV (Tag-Length-Value) encoding. The tag may be 'b', 'n', 's', '?', '\0' to represent a ByteBuffer, Number, String, Boolean, or Null respectively. The tag may also be capitalized (for 'b', 'n', and 's',) to represent an array of that type. If an array is stored, then a four-byte big-endian integer is written representing the number of array elements. If a ByteBuffer is stored, the length of the buffer is stored as a four-byte big-endian integer and the buffer then copied directly. Both Numbers and Strings are treated identically and are stored as UTF8 encoded Unicode, proceeded by the length of the encoded string (in bytes) as a four-byte big-endian integer. Boolean is encoded as a single byte, 0 for false and 1 for true (and so has no Length parameter). The Null tag ('\0') takes neither a Length nor a Value parameter.

The tags 'L' and 'M' are for the document types List and Map respectively. These are encoded recursively with the Length being the size of the collection. In the case of List, the value is a Length number of marshalled AttributeValues. If the case of Map, the value is a Length number of AttributeValue Pairs where the first must always have a String value.

This implementation does not recognize loops. If an AttributeValue contains itself (even indirectly) this code will recurse infinitely.

Parameters:

attributeValue -

Returns:

the serialized AttributeValue

See Also:

DataInput

unmarshall

public static com.amazonaws.services.dynamodbv2.model.AttributeValue unmarshall(java.nio.ByteBuffer plainText)

See Also:

marshall(AttributeValue)