com.vlkan.log4j2.logstash.layout.resolver.StackTraceObjectResolver 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 java.io.IOException;

class StackTraceObjectResolver implements StackTraceResolver {

    private final TemplateResolver stackTraceElementResolver;

    StackTraceObjectResolver(TemplateResolver stackTraceElementResolver) {
        this.stackTraceElementResolver = stackTraceElementResolver;
    }

    @Override
    public void resolve(Throwable throwable, JsonGenerator jsonGenerator) throws IOException {
        StackTraceElement[] stackTraceElements = throwable.getStackTrace();
        if (stackTraceElements.length  == 0) {
            jsonGenerator.writeNull();
        } else {
            jsonGenerator.writeStartArray();
            // noinspection ForLoopReplaceableByForEach (avoid iterator instantiation)
            for (int stackTraceElementIndex = 0; stackTraceElementIndex < stackTraceElements.length; stackTraceElementIndex++) {
                StackTraceElement stackTraceElement = stackTraceElements[stackTraceElementIndex];
                stackTraceElementResolver.resolve(stackTraceElement, jsonGenerator);
            }
            jsonGenerator.writeEndArray();
        }
    }

}