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19 changes: 11 additions & 8 deletions core/src/main/java/com/google/adk/events/Event.java
Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,7 @@
import java.util.Optional;
import java.util.Set;
import java.util.UUID;
import javax.annotation.Nullable;
import org.jspecify.annotations.Nullable;

// TODO - b/413761119 update Agent.java when resolved.
/** Represents an event in a session. */
Expand Down Expand Up @@ -344,11 +344,14 @@ public final String stringifyContent() {
/** Builder for {@link Event}. */
public static class Builder {

private String id;
private String invocationId;
private String author;
private static final String MISSING_INVOCATION_ID = "__adk__invocation__id__missing";
private static final String MISSING_AUTHOR = "__adk__author__unknown";

private @Nullable String id;
private @Nullable String invocationId;
private @Nullable String author;
private @Nullable Content content;
private EventActions actions;
private @Nullable EventActions actions;
private @Nullable Set<String> longRunningToolIds;
private @Nullable Boolean partial;
private @Nullable Boolean turnComplete;
Expand Down Expand Up @@ -522,9 +525,9 @@ public Builder modelVersion(@Nullable String value) {

public Event build() {
Event event = new Event();
event.setId(id);
event.setInvocationId(invocationId);
event.setAuthor(author);
event.setId(Optional.ofNullable(id).orElse(UUID.randomUUID().toString()));
event.setInvocationId(Optional.ofNullable(invocationId).orElse(MISSING_INVOCATION_ID));
event.setAuthor(Optional.ofNullable(author).orElse(MISSING_AUTHOR));
event.setContent(content);
event.setLongRunningToolIds(longRunningToolIds);
event.setPartial(partial);
Expand Down