The version of Apache log4j used by SoundHelix.

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v1.3alpha8 :: src / java / org / apache / log4j / rule /

Rule.java

/*
 * Copyright 1999,2004 The Apache Software Foundation.
 * 
 * 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.
 */

/*
 */
package org.apache.log4j.rule;

import org.apache.log4j.spi.LoggingEvent;

import java.beans.PropertyChangeListener;


/**
 * A Rule evaluates to true of false given a LoggingEvent object, and can notify
 * listeners when the underlying implementation of this Rule has it's
 * criteria changed by using the standard PropertyChangeListener infrastructure.
 *
 * @author Paul Smith <psmith@apache.org>
 * @author Scott Deboy <sdeboy@apache.org>
 */
public interface Rule {
  /**
   * Returns true if this implementation of the rule accepts the LoggingEvent, 
   * or false if not.
   *
   * <p>What True/False means can be client-specific.
   *
   * @param e LoggingEvent this instance will evaluate
   * @return true if this Rule instance accepts the event, otherwise false.
   */
  public boolean evaluate(LoggingEvent e);

  /**
   * Adds a PropertyChangeListener to this instance, which is notified when 
   * underlying Rule information has changed. 
   * (there are no specific property name events).
   * @param listener
   */
  public void addPropertyChangeListener(PropertyChangeListener listener);

  /**
   * Removes a known PropertyChangeListener from this Rule.
   * @param listener
   */
  public void removePropertyChangeListener(PropertyChangeListener listener);
}
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