/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.common.logging;

import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.filter.RegexFilter;
import org.apache.logging.log4j.message.ParameterizedMessage;

public class MockAppender extends AbstractAppender {
    public LogEvent lastEvent;

    public MockAppender(final String name) throws IllegalAccessException {
        super(name, RegexFilter.createFilter(".*(\n.*)*", new String[0], false, null, null), null);
    }

    @Override
    public void append(LogEvent event) {
        lastEvent = event.toImmutable();
    }

    ParameterizedMessage lastParameterizedMessage() {
        return (ParameterizedMessage) lastEvent.getMessage();
    }

    public LogEvent getLastEventAndReset() {
        LogEvent toReturn = lastEvent;
        lastEvent = null;
        return toReturn;
    }
}