package org.slf4j.spi;
   
   import java.util.function.Supplier;
   
   import org.slf4j.Marker;
   import org.slf4j.event.Level;
   
   /**
    * <p>A no-operation implementation of {@link LoggingEventBuilder}.</p>
   *
   * <p>As the name indicates, the method in this class do nothing, except when a return value is expected
   * in which case a singleton, i.e. the unique instance of this class is returned.
   * </p
   *
   * @author Ceki G&uuml;lc&uuml;
   * @since 2.0.0
   *
   */
  public class NOPLoggingEventBuilder implements LoggingEventBuilder {
  
      static final NOPLoggingEventBuilder SINGLETON = new NOPLoggingEventBuilder();
  
      private NOPLoggingEventBuilder() {
      }
  
      /**
       * <p>Returns the singleton instance of this class.
       * Used by {@link org.slf4j.Logger#makeLoggingEventBuilder(Level) makeLoggingEventBuilder(Level)}.</p>
       *
       * @return the singleton instance of this class
       */
      public static LoggingEventBuilder singleton() {
          return SINGLETON;
      }
  
      @Override
      public LoggingEventBuilder addMarker(Marker marker) {
          return singleton();
      }
  
      @Override
      public LoggingEventBuilder addArgument(Object p) {
          return singleton();
      }
  
      @Override
      public LoggingEventBuilder addArgument(Supplier<?> objectSupplier) {
          return singleton();
      }
  
      @Override
      public LoggingEventBuilder addKeyValue(String key, Object value) {
          return singleton();
      }
  
      @Override
      public LoggingEventBuilder addKeyValue(String key, Supplier<Object> value) {
          return singleton();
      }
  
      @Override
      public LoggingEventBuilder setCause(Throwable cause) {
          return singleton();
      }
  
      @Override
      public void log() {
      }
  
      @Override
      public LoggingEventBuilder setMessage(String message) {
          return this;
      }
      @Override
      public LoggingEventBuilder setMessage(Supplier<String> messageSupplier) {
          return this;
      }
  
      @Override
      public void log(String message) {
      }
  
      @Override
      public void log(Supplier<String> messageSupplier) {
      }
  
      @Override
      public void log(String message, Object arg) {
      }
  
      @Override
      public void log(String message, Object arg0, Object arg1) {
      }
  
      @Override
      public void log(String message, Object... args) {
  
      }
  
 }