com.vlkan.log4j2.logstash.layout.resolver.MarkerResolver Maven / Gradle / Ivy

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/*
 * Copyright 2017-2020 Volkan Yazıcı
 *
 * Licensed 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 permits and
 * limitations under the License.
 */

package com.vlkan.log4j2.logstash.layout.resolver;

import com.fasterxml.jackson.core.JsonGenerator;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.core.LogEvent;

import java.io.IOException;

class MarkerResolver implements EventResolver {

    private static final TemplateResolver NAME_RESOLVER = (logEvent, jsonGenerator) -> {
        Marker marker = logEvent.getMarker();
        if (marker == null) {
            jsonGenerator.writeNull();
        } else {
            jsonGenerator.writeString(marker.getName());
        }
    };

    private final TemplateResolver internalResolver;

    MarkerResolver(String key) {
        this.internalResolver = createInternalResolver(key);
    }

    private TemplateResolver createInternalResolver(String key) {
        switch (key) {
            case "name": return NAME_RESOLVER;
        }
        throw new IllegalArgumentException("unknown key: " + key);
    }

    static String getName() {
        return "marker";
    }

    @Override
    public void resolve(LogEvent logEvent, JsonGenerator jsonGenerator) throws IOException {
        internalResolver.resolve(logEvent, jsonGenerator);
    }

}