com.google.crypto.tink.internal

Class ParametersParser<SerializationT extends Serialization>

java.lang.Object

com.google.crypto.tink.internal.ParametersParser<SerializationT>

public abstract class ParametersParser<SerializationT extends Serialization>
extends Object

Parses Serialization objects into Parameters objects of a certain kind.

This class should eventually be in Tinks public API -- however, it might still change before that.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ParametersParser.ParametersParsingFunction<SerializationT extends Serialization> A function which parses a Parameters object.

Method Summary

Modifier and Type	Method and Description
static <SerializationT extends Serialization> ParametersParser<SerializationT>	create(ParametersParser.ParametersParsingFunction<SerializationT> function, Bytes objectIdentifier, Class<SerializationT> serializationClass) Creates a ParametersParser object.
Bytes	getObjectIdentifier() Returns the objectIdentifier for this serialization.
Class<SerializationT>	getSerializationClass()
abstract Parameters	parseParameters(SerializationT serialization) Parses a serialization into a Parameters object.

Methods inherited from class java.lang.Object

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

Method Detail

parseParameters

public abstract Parameters parseParameters(SerializationT serialization)
                                    throws GeneralSecurityException

Parses a serialization into a Parameters object.

This function is usually called with a Serialization matching the result of getObjectIdentifier. However, implementations should check that this is the case.

Throws:

GeneralSecurityException

getObjectIdentifier

public final Bytes getObjectIdentifier()

Returns the objectIdentifier for this serialization.

The object identifier is a unique identifier per registry for this object (in the standard proto serialization, it is the typeUrl). In other words, when registering a ParametersParser, the registry will invoke this to get the handled object identifier. In order to parse an object of type SerializationT, the registry will then obtain the objectIdentifier of this serialization object, and call the parser corresponding to this object.

getSerializationClass

public final Class<SerializationT> getSerializationClass()

create

public static <SerializationT extends Serialization> ParametersParser<SerializationT> create(ParametersParser.ParametersParsingFunction<SerializationT> function,
                                                                                             Bytes objectIdentifier,
                                                                                             Class<SerializationT> serializationClass)

Creates a ParametersParser object.

In order to create a ParametersParser object, one typically writes a function

 class MyClass {
   private static MyParameters parse(MySerialization parametersSerialization)
             throws GeneralSecurityException {
     ...
   }
 }
 

This function can then be used to create a ParametersParser:

 ParametersParser<MySerialization> parser =
       ParametersParser.create(MyClass::parse, objectIdentifier, MySerialization.class);
 

Parameters:

function - The function used to parse a Parameters object.

objectIdentifier - The identifier to be returned by getObjectIdentifier()

serializationClass - The class object corresponding to SerializationT