org.apache.log4j.helpers.AppenderAttachableImpl Maven / Gradle / Ivy
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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;
}
}
}
}