The version of Apache log4j used by SoundHelix.

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PRE_UGLI_MOVE :: src / java / org / apache / log4j / rule /

NotRule.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.util.Stack;

/**
 * A Rule class implementing logical not. 
 * 
 * @author Scott Deboy <sdeboy@apache.org>
 */
public class NotRule extends AbstractRule {
  static final long serialVersionUID = -6827159473117969306L;    
  private final Rule rule;

  private NotRule(Rule rule) {
    this.rule = rule;
  }

  public static Rule getRule(Rule rule) {
      return new NotRule(rule);
  }
  
  public static Rule getRule(Stack stack) {
      if (stack.size() < 1) {
          throw new IllegalArgumentException("Invalid NOT rule - expected one rule but received " + stack.size());
      }  
      Object o1 = stack.pop();
      if (o1 instanceof Rule) {
        Rule p1 = (Rule)o1;
        return new NotRule(p1);
      }
      throw new IllegalArgumentException("Invalid NOT rule: - expected rule but received " + o1);
  }

  public boolean evaluate(LoggingEvent event) {
    return !(rule.evaluate(event));
  }
}
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