@Override
    public void write(Encoder encoder, ImplementationSnapshot implementationSnapshot) throws Exception {
        Impl serializer = determineSerializer(implementationSnapshot);
        encoder.writeSmallInt(serializer.ordinal());
        serializer.write(encoder, implementationSnapshot);
    }

    private static Impl determineSerializer(ImplementationSnapshot implementationSnapshot) {

            if (valueSnapshot instanceof ImplementationSnapshot) {
                ImplementationSnapshot implementationSnapshot = (ImplementationSnapshot) valueSnapshot;
                validateNestedInput(workValidationContext, propertyName, implementationSnapshot);
            }
        });
    }

import org.gradle.internal.snapshot.FileSystemSnapshot;
import org.gradle.internal.snapshot.impl.ClassImplementationSnapshot;
import org.gradle.internal.snapshot.impl.ImplementationSnapshot;

import static org.gradle.internal.execution.history.impl.OutputSnapshotUtil.findOutputsStillPresentSincePreviousExecution;

public class DefaultExecutionStateChangeDetector implements ExecutionStateChangeDetector {