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Log4j2 Appender plugin pushing logs in batches to Elasticsearch (2.x/5.x/6.x/7.x/8.x) clusters

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package org.appenders.log4j2.elasticsearch.ahc;

/*-
 * #%L
 * log4j2-elasticsearch
 * %%
 * Copyright (C) 2022 Rafal Foltynski
 * %%
 * 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 permissions and
 * limitations under the License.
 * #L%
 */

/**
 * Carries error description of {@link BatchResult} or {@link BatchItemResult}
 */
public class Error {

    private static final String SEPARATOR = ". ";
    private static final Error[] NO_ROOT_CAUSE = new Error[0];

    private String type;

    private String reason;

    private Error causedBy;

    private Error[] rootCause = NO_ROOT_CAUSE;

    public String getType() {
        return type;
    }

    public void setType(final String type) {
        this.type = type;
    }

    public String getReason() {
        return reason;
    }

    public void setReason(final String reason) {
        this.reason = reason;
    }

    public Error getCausedBy() {
        return causedBy;
    }

    public void setCausedBy(final Error causedBy) {
        this.causedBy = causedBy;
    }

    public Error[] getRootCause() {
        return rootCause;
    }

    public void setRootCause(final Error[] rootCause) {
        this.rootCause = rootCause;
    }

    StringBuilder appendErrorMessage(final StringBuilder sb, int depth) {

        if (depth <= 0) {
            return sb;
        }

        depth -= 1;

        if (getCausedBy() != null) {
            getCausedBy().appendErrorMessage(sb, depth);
        }
        if (getRootCause().length > 0) {
            getRootCause()[0].appendErrorMessage(sb, depth);
        }

        if (getType() != null) {
            sb.append(SEPARATOR).append("type: ").append(getType());
        }
        if (getReason() != null) {
            sb.append(SEPARATOR).append("reason: ").append(getReason());

        }

        return sb;
    }

}