--- /dev/null
+/*
+ * 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.Level;
+import org.apache.log4j.Category;
+import org.apache.log4j.Logger;
+import org.apache.log4j.Appender;
+
+import java.util.Enumeration;
+import java.util.Vector;
+
+/**
+ * No-operation implementation of LoggerRepository which is used when
+ * LogManager.repositorySelector is erroneously nulled during class reloading.
+ * @since 1.2.15
+ */
+public final class NOPLoggerRepository implements LoggerRepository {
+ /**
+ * {@inheritDoc}
+ */
+ public void addHierarchyEventListener(final HierarchyEventListener listener) {
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public boolean isDisabled(final int level) {
+ return true;
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void setThreshold(final Level level) {
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void setThreshold(final String val) {
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void emitNoAppenderWarning(final Category cat) {
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public Level getThreshold() {
+ return Level.OFF;
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public Logger getLogger(final String name) {
+ return new NOPLogger(this, name);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public Logger getLogger(final String name, final LoggerFactory factory) {
+ return new NOPLogger(this, name);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public Logger getRootLogger() {
+ return new NOPLogger(this, "root");
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public Logger exists(final String name) {
+ return null;
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void shutdown() {
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public Enumeration getCurrentLoggers() {
+ return new Vector().elements();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public Enumeration getCurrentCategories() {
+ return getCurrentLoggers();
+ }
+
+
+ /**
+ * {@inheritDoc}
+ */
+ public void fireAddAppenderEvent(Category logger, Appender appender) {
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void resetConfiguration() {
+ }
+}