Switch to slf4j simple logger (fixes #835) (#868)

logging/src/main/java/org/slf4j/impl/StaticLoggerBinder.java

@@ -0,0 +1,82 @@
+/*
+ * 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.slf4j.impl;
+
+import org.slf4j.ILoggerFactory;
+import org.slf4j.spi.LoggerFactoryBinder;
+
+/**
+ * SLF4J LoggerFactoryBinder implementation using MavenSimpleLogger.
+ * This class is part of the required classes used to specify an
+ * SLF4J logger provider implementation.
+ *
+ * @since 3.5.1
+ */
+public final class StaticLoggerBinder implements LoggerFactoryBinder {
+    /**
+     * Declare the version of the SLF4J API this implementation is compiled
+     * against. The value of this field is usually modified with each release.
+     */
+    // to avoid constant folding by the compiler, this field must *not* be final
+    @SuppressWarnings({"checkstyle:staticvariablename", "checkstyle:visibilitymodifier"})
+    public static String REQUESTED_API_VERSION = "1.7.25"; // !final
+
+    private static final String LOGGER_FACTORY_CLASS_STR = MvndLoggerFactory.class.getName();
+
+    /**
+     * The unique instance of this class.
+     */
+    private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
+
+    /**
+     * The ILoggerFactory instance returned by the {@link #getLoggerFactory}
+     * method should always be the same object
+     */
+    private final ILoggerFactory loggerFactory;
+
+    /**
+     * Private constructor to prevent instantiation
+     */
+    private StaticLoggerBinder() {
+        loggerFactory = new MvndLoggerFactory();
+    }
+
+    /**
+     * Returns the singleton of this class.
+     */
+    public static StaticLoggerBinder getSingleton() {
+        return SINGLETON;
+    }
+
+    /**
+     * Returns the factory.
+     */
+    @Override
+    public ILoggerFactory getLoggerFactory() {
+        return loggerFactory;
+    }
+
+    /**
+     * Returns the class name.
+     */
+    @Override
+    public String getLoggerFactoryClassStr() {
+        return LOGGER_FACTORY_CLASS_STR;
+    }
+}