/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements.  See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License.  You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.apache.log4j.spi;import org.apache.log4j.Appender;import org.apache.log4j.Level;import org.apache.log4j.Logger;import org.apache.log4j.Priority;import java.util.Enumeration;import java.util.ResourceBundle;import java.util.Vector;/** * No-operation implementation of Logger used by NOPLoggerRepository. * @since 1.2.15 */public final class NOPLogger extends Logger {    /**     * Create instance of Logger.     * @param repo repository, may not be null.     * @param name name, may not be null, use "root" for root logger.     */    public NOPLogger(NOPLoggerRepository repo, final String name) {        super(name);        this.repository = repo;        this.level = Level.OFF;        this.parent = this;    }    /** {@inheritDoc} */    public void addAppender(final Appender newAppender) {    }    /** {@inheritDoc} */    public void assertLog(final boolean assertion, final String msg) {    }    /** {@inheritDoc} */    public void callAppenders(final LoggingEvent event) {    }    /** {@inheritDoc} */    void closeNestedAppenders() {    }    /** {@inheritDoc} */    public void debug(final Object message) {    }    /** {@inheritDoc} */    public void debug(final Object message, final Throwable t) {    }    /** {@inheritDoc} */    public void error(final Object message) {    }    /** {@inheritDoc} */    public void error(final Object message, final Throwable t) {    }    /** {@inheritDoc} */    public void fatal(final Object message) {    }    /** {@inheritDoc} */    public void fatal(final Object message, final Throwable t) {    }    /** {@inheritDoc} */    public Enumeration getAllAppenders() {      return new Vector().elements();    }    /** {@inheritDoc} */    public Appender getAppender(final String name) {       return null;    }    /** {@inheritDoc} */    public Level getEffectiveLevel() {      return Level.OFF;    }    /** {@inheritDoc} */    public Priority getChainedPriority() {      return getEffectiveLevel();    }    /** {@inheritDoc} */    public ResourceBundle getResourceBundle() {      return null;    }    /** {@inheritDoc} */    public void info(final Object message) {    }    /** {@inheritDoc} */    public void info(final Object message, final Throwable t) {    }    /** {@inheritDoc} */    public boolean isAttached(Appender appender) {      return false;    }    /** {@inheritDoc} */    public boolean isDebugEnabled() {      return false;    }    /** {@inheritDoc} */    public boolean isEnabledFor(final Priority level) {      return false;    }    /** {@inheritDoc} */    public boolean isInfoEnabled() {      return false;    }    /** {@inheritDoc} */    public void l7dlog(final Priority priority, final String key, final Throwable t) {    }    /** {@inheritDoc} */    public void l7dlog(final Priority priority, final String key,  final Object[] params, final Throwable t) {    }    /** {@inheritDoc} */    public void log(final Priority priority, final Object message, final Throwable t) {    }    /** {@inheritDoc} */    public void log(final Priority priority, final Object message) {    }    /** {@inheritDoc} */    public void log(final String callerFQCN, final Priority level, final Object message, final Throwable t) {    }    /** {@inheritDoc} */    public void removeAllAppenders() {    }    /** {@inheritDoc} */    public void removeAppender(Appender appender) {    }    /** {@inheritDoc} */    public void removeAppender(final String name) {    }    /** {@inheritDoc} */    public void setLevel(final Level level) {    }    /** {@inheritDoc} */    public void setPriority(final Priority priority) {    }    /** {@inheritDoc} */    public void setResourceBundle(final ResourceBundle bundle) {    }    /** {@inheritDoc} */    public void warn(final Object message) {    }    /** {@inheritDoc} */    public void warn(final Object message, final Throwable t) {    }    /** {@inheritDoc} */    public void trace(Object message) {    }    /** {@inheritDoc} */    public void trace(Object message, Throwable t) {    }    /** {@inheritDoc} */    public boolean isTraceEnabled() {        return false;    }}