Class ConversationPreprocessor

java.lang.Object

com.google.adk.a2a.converters.ConversationPreprocessor

public final class ConversationPreprocessor
extends Object

Preprocesses a batch of ADK events prior to invoking a remote A2A agent.

The class splits the conversation into two logical buckets:

• The historical session events that should be preserved as-is when relayed over the wire.
• The most recent user-authored text event, surfaced separately so it can be supplied as the pending user input on the InvocationContext.

This mirrors the Python A2A implementation where the in-flight user message is maintained separately from the persisted transcript.

**EXPERIMENTAL:** Subject to change, rename, or removal in any future patch release. Do not use in production code.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	ConversationPreprocessor.PreparedInput	Immutable value that surfaces the results of preprocessing.

Method Summary

Modifier and Type	Method	Description
static ConversationPreprocessor.PreparedInput	extractHistoryAndUserContent(List<Event> inputEvents)	Splits the provided event list into history and the latest user-authored text message.

Methods inherited from class Object

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

Method Details

extractHistoryAndUserContent

public static ConversationPreprocessor.PreparedInput extractHistoryAndUserContent(List<Event> inputEvents)

Splits the provided event list into history and the latest user-authored text message.

Parameters:

inputEvents - ordered session events, oldest to newest; may be null

Returns:

container encapsulating the derived history, optional user content, and the original user event when present