itextpdf-master/itext/src/main/java/com/itextpdf/text/log/CounterFactory.java
/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2022 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS.
 *
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 * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details. You should have received a copy of the GNU Affero General Public
 * License along with this program; if not, see http://www.gnu.org/licenses or
 * write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
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 * Section 5 of the GNU Affero General Public License.
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 * covered work must retain the producer line in every PDF that is created or
 * manipulated using iText.
 *
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 * commercial license. Buying such a license is mandatory as soon as you develop
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 */
package com.itextpdf.text.log;

/**
 * Factory that creates a counter for every reader or writer class.
 * You can implement your own counter and declare it like this:
 * <code>CounterFactory.getInstance().setCounter(new SysoCounter());</code>
 * SysoCounter is just an example of a Counter implementation.
 * It writes info about files being read and written to the System.out.
 * 
 * This functionality can be used to create metrics in a SaaS context.
 */
public class CounterFactory {

	/** The singleton instance. */
	private static CounterFactory myself;
	static {
		myself = new CounterFactory();
	}
	
	/** The current counter implementation. */
	private Counter counter = new DefaultCounter();

	/** The empty constructor. */
	private CounterFactory() {}
	
	/** Returns the singleton instance of the factory. */
	public static CounterFactory getInstance() {
		return myself;
	}
	
	/** Returns a counter factory. */
	public static Counter getCounter(Class<?> klass) {
		return myself.counter.getCounter(klass);
	}
	
	/**
	 * Getter for the counter.
	 */
	public Counter getCounter() {
		return counter;
	}
	
	/**
	 * Setter for the counter.
	 */
	public void setCounter(Counter counter) {
		this.counter = counter;
	}
}
