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/*
 * 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.
 */

package org.apache.log4j.spi;

import java.io.InputStream;
import java.net.URL;

/**
   Implemented by classes capable of configuring log4j using a URL.
   
   @since 1.0
   @author Anders Kristensen
 */
public interface Configurator {

  /**
     Special level value signifying inherited behaviour. The current
     value of this string constant is inherited. {@link #NULL}
     is a synonym.  */
  public static final String INHERITED = "inherited";

  /**
     Special level signifying inherited behaviour, same as {@link
     #INHERITED}. The current value of this string constant is
     null. */
  public static final String NULL = "null";



  /**
    Interpret a resource pointed by a InputStream and set up log4j accordingly.

    The configuration is done relative to the hierarchy
    parameter.

    @param inputStream The InputStream to parse
    @param repository The hierarchy to operation upon.

    @since 1.2.17
   */
  void doConfigure(InputStream inputStream, LoggerRepository repository);

  /**
     Interpret a resource pointed by a URL and set up log4j accordingly.

     The configuration is done relative to the hierarchy
     parameter.

     @param url The URL to parse
     @param repository The hierarchy to operation upon.
   */
  void doConfigure(URL url, LoggerRepository repository);
}