https://openjdk.java.net/ 
public interface jdk.internal.jline.console.completer.CompletionHandler
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.internal.jline.console.completer.CompletionHandler
  super_class: java.lang.Object
{
  public abstract boolean complete(jdk.internal.jline.console.ConsoleReader, java.util.List<java.lang.CharSequence>, );
    descriptor: (Ljdk/internal/jline/console/ConsoleReader;Ljava/util/List;I)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException
    Signature: (Ljdk/internal/jline/console/ConsoleReader;Ljava/util/List<Ljava/lang/CharSequence;>;I)Z
    MethodParameters:
            Name  Flags
      reader      
      candidates  
      position    
}
SourceFile: "CompletionHandler.java"