001package org.slf4j.spi;
002
003import java.util.function.Supplier;
004
005import org.slf4j.Marker;
006import org.slf4j.event.Level;
007
008/**
009 * <p>A no-operation implementation of {@link LoggingEventBuilder}.</p>
010 *
011 * <p>As the name indicates, the method in this class do nothing, except when a return value is expected
012 * in which case a singleton, i.e. the unique instance of this class is returned.
013 * </p
014 *
015 * @author Ceki G&uuml;lc&uuml;
016 * @since 2.0.0
017 *
018 */
019public class NOPLoggingEventBuilder implements LoggingEventBuilder {
020
021    static final NOPLoggingEventBuilder SINGLETON = new NOPLoggingEventBuilder();
022
023    private NOPLoggingEventBuilder() {
024    }
025
026    /**
027     * <p>Returns the singleton instance of this class.
028     * Used by {@link org.slf4j.Logger#makeLoggingEventBuilder(Level) makeLoggingEventBuilder(Level)}.</p>
029     *
030     * @return the singleton instance of this class
031     */
032    public static LoggingEventBuilder singleton() {
033        return SINGLETON;
034    }
035
036    @Override
037    public LoggingEventBuilder addMarker(Marker marker) {
038        return singleton();
039    }
040
041    @Override
042    public LoggingEventBuilder addArgument(Object p) {
043        return singleton();
044    }
045
046    @Override
047    public LoggingEventBuilder addArgument(Supplier<?> objectSupplier) {
048        return singleton();
049    }
050
051    @Override
052    public LoggingEventBuilder addKeyValue(String key, Object value) {
053        return singleton();
054    }
055
056    @Override
057    public LoggingEventBuilder addKeyValue(String key, Supplier<Object> value) {
058        return singleton();
059    }
060
061    @Override
062    public LoggingEventBuilder setCause(Throwable cause) {
063        return singleton();
064    }
065
066    @Override
067    public void log() {
068    }
069
070    @Override
071    public LoggingEventBuilder setMessage(String message) {
072        return this;
073    }
074    @Override
075    public LoggingEventBuilder setMessage(Supplier<String> messageSupplier) {
076        return this;
077    }
078
079    @Override
080    public void log(String message) {
081    }
082
083    @Override
084    public void log(Supplier<String> messageSupplier) {
085    }
086
087    @Override
088    public void log(String message, Object arg) {
089    }
090
091    @Override
092    public void log(String message, Object arg0, Object arg1) {
093    }
094
095    @Override
096    public void log(String message, Object... args) {
097
098    }
099
100}