/*
* 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 <code>doAppend</code> 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 <code>null</code> 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 <code>name</code>.
<p>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 <code>true</code> if the specified appender is in the
list of attached appenders, <code>false</code> 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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