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package org.apache.log4j.rewrite;

import org.apache.log4j.spi.LoggingEvent;

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.
*/

/**
 * This interface is implemented to provide a rewrite strategy for
 * RewriteAppender. RewriteAppender will call the rewrite method with a source
 * logging event. The strategy may return that event, create a new event or
 * return null to suppress the logging request.
 */
public interface RewritePolicy {
    /**
     * Rewrite a logging event.
     * 
     * @param source a logging event that may be returned or used to create a new
     *               logging event.
     * @return a logging event or null to suppress processing.
     */
    LoggingEvent rewrite(final LoggingEvent source);
}