minecraft-src/net/minecraft/commands/execution/ExecutionControl.java

package net.minecraft.commands.execution;

import net.minecraft.commands.ExecutionCommandSource;
import org.jetbrains.annotations.Nullable;

public interface ExecutionControl<T> {
	void queueNext(EntryAction<T> entry);

	void tracer(@Nullable TraceCallbacks tracer);

	@Nullable
	TraceCallbacks tracer();

	Frame currentFrame();

	static <T extends ExecutionCommandSource<T>> ExecutionControl<T> create(ExecutionContext<T> executionContext, Frame frame) {
		return new ExecutionControl<T>() {
			@Override
			public void queueNext(EntryAction<T> entry) {
				executionContext.queueNext(new CommandQueueEntry<>(frame, entry));
			}

			@Override
			public void tracer(@Nullable TraceCallbacks tracer) {
				executionContext.tracer(tracer);
			}

			@Nullable
			@Override
			public TraceCallbacks tracer() {
				return executionContext.tracer();
			}

			@Override
			public Frame currentFrame() {
				return frame;
			}
		};
	}
}