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package org.slf4j.spi;

import java.util.function.Supplier;

import org.slf4j.Marker;
import org.slf4j.event.Level;

/**
 * 

A no-operation implementation of {@link LoggingEventBuilder}.

* *

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. *

Returns the singleton instance of this class. * Used by {@link org.slf4j.Logger#makeLoggingEventBuilder(Level) makeLoggingEventBuilder(Level)}.

* * @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 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 messageSupplier) { return this; } @Override public void log(String message) { } @Override public void log(Supplier 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) { } }