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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/*
* $Id$
*
*/
package com.yahoo.logserver.formatter;
import java.util.HashMap;
import java.util.Map;
/**
* This singleton class implements a central registry of LogFormatter
* instances.
*
* @author Bjorn Borud
*/
public class LogFormatterManager {
private static final LogFormatterManager instance;
static {
instance = new LogFormatterManager();
instance.addLogFormatterInternal("system.textformatter", new TextFormatter());
instance.addLogFormatterInternal("system.nullformatter", new NullFormatter());
}
private final Map<String, LogFormatter> logFormatters = new HashMap<String, LogFormatter>();
private LogFormatterManager() {}
/**
* LogFormatter lookup function
*
* @param name The name of the LogFormatter to be looked up.
* @return Returns the LogFormatter associated with this name or
* <code>null</code> if not found.
*/
public static LogFormatter getLogFormatter(String name) {
synchronized (instance.logFormatters) {
return instance.logFormatters.get(name);
}
}
/**
* Get the names of the defined formatters.
*
* @return Returns an array containing the names of formatters that
* have been registered.
*/
public static String[] getFormatterNames() {
synchronized (instance.logFormatters) {
String[] formatterNames = new String[instance.logFormatters.keySet().size()];
instance.logFormatters.keySet().toArray(formatterNames);
return formatterNames;
}
}
/**
* Internal method which takes care of the job of adding
* LogFormatter mappings but doesn't perform any of the checks
* performed by the public method for adding mappings.
*/
private void addLogFormatterInternal(String name, LogFormatter logFormatter) {
synchronized (logFormatters) {
logFormatters.put(name, logFormatter);
}
}
}
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