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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.helpers;

import org.apache.log4j.spi.AppenderAttachable;
import org.apache.log4j.spi.LoggingEvent;

import org.apache.log4j.Appender;
import java.util.Vector;
import java.util.Enumeration;

/**
   A straightforward implementation of the {@link AppenderAttachable}
   interface.

   @author Ceki Gülcü
   @since version 0.9.1 */
public class AppenderAttachableImpl implements AppenderAttachable {
  
  /** Array of appenders. */
  protected Vector  appenderList;

  /**
     Attach an appender. If the appender is already in the list in
     won't be added again.
  */
  public
  void addAppender(Appender newAppender) {
    // Null values for newAppender parameter are strictly forbidden.
    if(newAppender == null)
      return;
    
    if(appenderList == null) {
      appenderList = new Vector(1);
    }
    if(!appenderList.contains(newAppender))
      appenderList.addElement(newAppender);
  }

  /**
     Call the doAppend method on all attached appenders.  */
  public
  int appendLoopOnAppenders(LoggingEvent event) {
    int size = 0;
    Appender appender;

    if(appenderList != null) {
      size = appenderList.size();
      for(int i = 0; i < size; i++) {
	appender = (Appender) appenderList.elementAt(i);
	appender.doAppend(event);
      }
    }    
    return size;
  }


  /**
     Get all attached appenders as an Enumeration. If there are no
     attached appenders null is returned.
     
     @return Enumeration An enumeration of attached appenders.
   */
  public
  Enumeration getAllAppenders() {
    if(appenderList == null)
      return null;
    else 
      return appenderList.elements();    
  }

  /**
     Look for an attached appender named as name.

     

Return the appender with that name if in the list. Return null otherwise. */ public Appender getAppender(String name) { if(appenderList == null || name == null) return null; int size = appenderList.size(); Appender appender; for(int i = 0; i < size; i++) { appender = (Appender) appenderList.elementAt(i); if(name.equals(appender.getName())) return appender; } return null; } /** Returns true if the specified appender is in the list of attached appenders, false otherwise. @since 1.2 */ public boolean isAttached(Appender appender) { if(appenderList == null || appender == null) return false; int size = appenderList.size(); Appender a; for(int i = 0; i < size; i++) { a = (Appender) appenderList.elementAt(i); if(a == appender) return true; } return false; } /** * Remove and close all previously attached appenders. * */ public void removeAllAppenders() { if(appenderList != null) { int len = appenderList.size(); for(int i = 0; i < len; i++) { Appender a = (Appender) appenderList.elementAt(i); a.close(); } appenderList.removeAllElements(); appenderList = null; } } /** Remove the appender passed as parameter form the list of attached appenders. */ public void removeAppender(Appender appender) { if(appender == null || appenderList == null) return; appenderList.removeElement(appender); } /** Remove the appender with the name passed as parameter form the list of appenders. */ public void removeAppender(String name) { if(name == null || appenderList == null) return; int size = appenderList.size(); for(int i = 0; i < size; i++) { if(name.equals(((Appender)appenderList.elementAt(i)).getName())) { appenderList.removeElementAt(i); break; } } } }





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