software.amazon.qldb

Class QldbHash

java.lang.Object

software.amazon.qldb.QldbHash

public class QldbHash
extends Object

A QLDB hash is either a 256 bit number or a special empty hash. See QLDB Verification

The QLDB hash is used to create the commit hash of the transaction. The QLDB hash information is generated using the transaction id with the statements and their parameters used in the transaction.

Constructor Summary

Constructors

Constructor and Description
QldbHash(byte[] qldbHash, com.amazon.ion.IonSystem ionSystem)

Method Summary

Modifier and Type	Method and Description
QldbHash	dot(QldbHash that) The QLDB dot operator joins two hashes and generates a new hash.
boolean	equals(Object other)
int	getHashSize()
byte[]	getQldbHash() Retrieves the `QldbHash` bytes.
int	hashCode()
boolean	isEmpty()
static QldbHash	toQldbHash(com.amazon.ion.IonValue value, com.amazon.ion.IonSystem ionSystem) The QLDB Hash of an IonValue is just the IonHash of that value.
static QldbHash	toQldbHash(String value, com.amazon.ion.IonSystem ionSystem)
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

QldbHash

public QldbHash(byte[] qldbHash,
                com.amazon.ion.IonSystem ionSystem)

Method Detail

toQldbHash

public static QldbHash toQldbHash(String value,
                                  com.amazon.ion.IonSystem ionSystem)

toQldbHash

public static QldbHash toQldbHash(com.amazon.ion.IonValue value,
                                  com.amazon.ion.IonSystem ionSystem)

The QLDB Hash of an IonValue is just the IonHash of that value.

Parameters:

value - The Ion value to hash.

ionSystem - The Ion system that is used to read the Ion value.

Returns:

An instance of the `QldbHash` with the hashed Ion values.

dot

public QldbHash dot(QldbHash that)

The QLDB dot operator joins two hashes and generates a new hash.

Parameters:

that - The Ion value to hash.

Returns:

An instance of the `QldbHash` with the hashed ion values.

equals

public boolean equals(Object other)

Overrides:

equals in class Object

getHashSize

public int getHashSize()

getQldbHash

public byte[] getQldbHash()

Retrieves the `QldbHash` bytes.

Returns:

The `QldbHash` in bytes.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

isEmpty

public boolean isEmpty()

toString

public String toString()

Overrides:

toString in class Object