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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;

/*
 * DSI utilities
 *
 * Copyright (C) 2005-2019 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.fastutil.Hash;
import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
import it.unimi.dsi.lang.MutableString;

/** A factory for well-formed XML documents.
 *
 * This factory assumes that every new name of an element type or of an
 * attribute is new valid name. For entities, instead, resolution is
 * deferred to {@link it.unimi.dsi.parser.HTMLFactory}.
 *
 * @author Sebastiano Vigna
 * @since 1.0.2
 */

public class WellFormedXmlFactory implements ParsingFactory {
	/** The load factor for all maps. */
	private static final float ONE_HALF = .5f;

	/** A (quick) map from attribute names to attributes. */
    private final Object2ObjectOpenHashMap name2Attribute = new Object2ObjectOpenHashMap<>(Hash.DEFAULT_INITIAL_SIZE, ONE_HALF);

    /** A (quick) map from element-type names to element types. */
    private final Object2ObjectOpenHashMap name2Element = new Object2ObjectOpenHashMap<>(Hash.DEFAULT_INITIAL_SIZE, ONE_HALF);

	public WellFormedXmlFactory() {}

	@Override
	public Element getElement(final MutableString name) {
		Element element = name2Element.get(name);
		if (element == null) {
			element = new Element(name);
			name2Element.put(element.name, element);
		}
		return element;
	}

	@Override
	public Attribute getAttribute(final MutableString name) {
		Attribute attribute = name2Attribute.get(name);
		if (attribute == null) {
			attribute = new Attribute(name);
			name2Attribute.put(attribute.name, attribute);
		}
		return attribute;
	}

	@Override
	public Entity getEntity(final MutableString name) {
		return HTMLFactory.INSTANCE.getEntity(name);
	}
}