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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.events.fields.providers;

import org.graylog.events.event.EventWithContext;
import org.graylog.events.fields.FieldValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class AbstractFieldValueProvider implements FieldValueProvider {
    public interface Factory extends FieldValueProvider.Factory {
        @Override
        TYPE create(Config config);
    }

    private static final Logger LOG = LoggerFactory.getLogger(AbstractFieldValueProvider.class);

    private final Config config;

    public AbstractFieldValueProvider(Config config) {
        this.config = config;
    }

    @Override
    public FieldValue get(String fieldName, EventWithContext eventWithContext) {
        try {
            return doGet(fieldName, eventWithContext);
        } catch (Exception e) {
            LOG.error("Couldn't execute field value provider: {}", config, e);
            return FieldValue.error();
        }
    }

    protected abstract FieldValue doGet(String fieldName, EventWithContext eventWithContext);
}