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 */
017package org.apache.logging.log4j.core.selector;
018
019import java.net.URI;
020import java.util.ArrayList;
021import java.util.Collections;
022import java.util.List;
023
024import org.apache.logging.log4j.core.LoggerContext;
025import org.apache.logging.log4j.core.impl.ContextAnchor;
026
027/**
028 * Returns either this Thread's context or the default LoggerContext.
029 */
030public class BasicContextSelector implements ContextSelector {
031
032    private static final LoggerContext CONTEXT = new LoggerContext("Default");
033
034    @Override
035    public LoggerContext getContext(final String fqcn, final ClassLoader loader, final boolean currentContext) {
036
037        final LoggerContext ctx = ContextAnchor.THREAD_CONTEXT.get();
038        return ctx != null ? ctx : CONTEXT;
039    }
040
041
042    @Override
043    public LoggerContext getContext(final String fqcn, final ClassLoader loader, final boolean currentContext,
044                                    final URI configLocation) {
045
046        final LoggerContext ctx = ContextAnchor.THREAD_CONTEXT.get();
047        return ctx != null ? ctx : CONTEXT;
048    }
049
050    public LoggerContext locateContext(final String name, final String configLocation) {
051        return CONTEXT;
052    }
053
054    @Override
055    public void removeContext(final LoggerContext context) {
056        // does not remove anything
057    }
058
059    @Override
060    public List<LoggerContext> getLoggerContexts() {
061        final List<LoggerContext> list = new ArrayList<>();
062        list.add(CONTEXT);
063        return Collections.unmodifiableList(list);
064    }
065
066}