| /* |
| * 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.logging.log4j.layout.template.json.resolver; |
| |
| import org.apache.logging.log4j.Marker; |
| import org.apache.logging.log4j.core.LogEvent; |
| import org.apache.logging.log4j.layout.template.json.util.JsonWriter; |
| |
| /** |
| * A {@link Marker} resolver. |
| * |
| * <h3>Configuration</h3> |
| * |
| * <pre> |
| * config = "field" -> "name" |
| * </pre> |
| * |
| * <h3>Examples</h3> |
| * |
| * Resolve the marker name: |
| * |
| * <pre> |
| * { |
| * "$resolver": "marker", |
| * "field": "name" |
| * } |
| * </pre> |
| */ |
| final class MarkerResolver implements EventResolver { |
| |
| private static final TemplateResolver<LogEvent> NAME_RESOLVER = |
| (final LogEvent logEvent, final JsonWriter jsonWriter) -> { |
| final Marker marker = logEvent.getMarker(); |
| if (marker == null) { |
| jsonWriter.writeNull(); |
| } else { |
| jsonWriter.writeString(marker.getName()); |
| } |
| }; |
| |
| private final TemplateResolver<LogEvent> internalResolver; |
| |
| MarkerResolver(final TemplateResolverConfig config) { |
| this.internalResolver = createInternalResolver(config); |
| } |
| |
| private TemplateResolver<LogEvent> createInternalResolver( |
| final TemplateResolverConfig config) { |
| final String fieldName = config.getString("field"); |
| if ("name".equals(fieldName)) { |
| return NAME_RESOLVER; |
| } |
| throw new IllegalArgumentException("unknown field: " + config); |
| } |
| |
| static String getName() { |
| return "marker"; |
| } |
| |
| @Override |
| public boolean isResolvable(final LogEvent logEvent) { |
| return logEvent.getMarker() != null; |
| } |
| |
| @Override |
| public void resolve( |
| final LogEvent logEvent, |
| final JsonWriter jsonWriter) { |
| internalResolver.resolve(logEvent, jsonWriter); |
| } |
| |
| } |