001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements. See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache license, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License. You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the license for the specific language governing permissions and
015     * limitations under the license.
016     */
017    package org.apache.logging.log4j.core.selector;
018    
019    import org.apache.logging.log4j.core.LoggerContext;
020    import org.apache.logging.log4j.core.impl.ContextAnchor;
021    
022    import java.util.ArrayList;
023    import java.util.Collections;
024    import java.util.List;
025    
026    /**
027     * Returns either this Thread's context or the default LoggerContext.
028     */
029    public class BasicContextSelector implements ContextSelector {
030    
031        private static final LoggerContext CONTEXT = new LoggerContext("Default");
032    
033        public LoggerContext getContext(final String fqcn, final ClassLoader loader, final boolean currentContext) {
034    
035            final LoggerContext ctx = ContextAnchor.THREAD_CONTEXT.get();
036            return ctx != null ? ctx : CONTEXT;
037        }
038    
039        public LoggerContext locateContext(final String name, final String configLocation) {
040            return CONTEXT;
041        }
042    
043        public void removeContext(final LoggerContext context) {
044    
045        }
046    
047        public List<LoggerContext> getLoggerContexts() {
048            final List<LoggerContext> list = new ArrayList<LoggerContext>();
049            list.add(CONTEXT);
050            return Collections.unmodifiableList(list);
051        }
052    
053    }