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The DSI utilities are a mishmash of classes accumulated during the last twenty years in projects developed at the DSI (Dipartimento di Scienze dell'Informazione, i.e., Information Sciences Department), now DI (Dipartimento di Informatica, i.e., Informatics Department), of the Universita` degli Studi di Milano.

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package it.unimi.dsi.parser.callback;

/*
 * DSI utilities
 *
 * Copyright (C) 2005-2018 Sebastiano Vigna
 *
 *  This library is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU Lesser General Public License as published by the Free
 *  Software Foundation; either version 3 of the License, or (at your option)
 *  any later version.
 *
 *  This library is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, see .
 *
 */

import it.unimi.dsi.lang.MutableString;
import it.unimi.dsi.parser.Attribute;
import it.unimi.dsi.parser.BulletParser;
import it.unimi.dsi.parser.Element;

import java.util.Map;

/**
 * A default, do-nothing-at-all callback.
 *
 * Callbacks can inherit from this class and forget about methods they are not interested in.
 *
 * This class has a protected constructor. If you need an instance of this class, use
 * {@link #getInstance()}.
 */
public class DefaultCallback implements Callback {
	private static final DefaultCallback SINGLETON = new DefaultCallback();

	protected DefaultCallback() {}

	/**
	 * Returns the singleton instance of the default callback.
	 *
	 * @return the singleton instance of the default callback.
	 */
	public static DefaultCallback getInstance() {
		return SINGLETON;
	}

	@Override
	public void configure(final BulletParser parserUnused) {}

	@Override
	public void startDocument() {}

	@Override
	public boolean startElement(final Element elementUnused, final Map attrMapUnused) {
		return true;
	}

	@Override
	public boolean endElement(final Element elementUnused) {
		return true;
	}

	@Override
	public boolean characters(final char[] textUnused, final int offsetUnused, final int lengthUnused, final boolean flowBrokenUnused) {
		return true;
	}

	@Override
	public boolean cdata(final Element elementUnused, final char[] textUnused, final int offsetUnused, final int lengthUnused) {
		return true;
	}

	@Override
	public void endDocument() {}
}