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/*
 * Copyright (c) 2013 Univocity Software Pty Ltd. All rights reserved.
 * This file is subject to the terms and conditions defined in file
 * 'LICENSE.txt', which is part of this source code package.
 */

package com.univocity.api.statistics;

/**
 * A singleton {@link DataTransfer} that does nothing.
 *
 * @author Univocity Software Pty Ltd - [email protected]
 */
public final class NoopDataTransfer implements DataTransfer {

	private NoopDataTransfer() {

	}

	/**
	 * The only instance available of a {@code NoopDataTransfer}
	 */
	public static final DataTransfer instance = new NoopDataTransfer();

	/**
	 * Returns the singleton {@link #instance} of a {@code NoopDataTransfer} in generic-friendly way
	 *
	 * @param  the source of data, where data is coming from
	 * @param  the target of data, where data is being transferred into.
	 *
	 * @return the {@code NoopDataTransfer} singleton {@link #instance}
	 */
	public static final  DataTransfer getInstance() {
		return instance;
	}

	@Override
	public final void started(Object source, long totalSize, Object target) {

	}

	@Override
	public final void transferred(Object source, long transferred, Object target) {

	}

	@Override
	public final void completed(Object source, Object target) {

	}

	@Override
	public final void aborted(Object source, Object target, Exception error) {

	}

	@Override
	public boolean isStarted() {
		return false;
	}

	@Override
	public boolean isRunning() {
		return false;
	}

	@Override
	public boolean isAborted() {
		return false;
	}
}