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Jericho HTML Parser is a java library allowing analysis and manipulation of parts of an HTML document, including server-side tags, while reproducing verbatim any unrecognised or invalid HTML.

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// Jericho HTML Parser - Java based library for analysing and manipulating HTML
// Version 2.3
// Copyright (C) 2006 Martin Jericho
// http://sourceforge.net/projects/jerichohtml/
//
// 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 2.1 of the License, or (at your option) any later version.
// http://www.gnu.org/copyleft/lesser.html
//
// 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 library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

package au.id.jericho.lib.html;

import java.util.*;

/**
 * Represents a cached map of character positions to tags.
 * The allTagTypesSubCache object is used to cache all tags.
 * Additional subcaches are used to cache single tag types, which increases the performance when searching for those tag types.
 * A list of tag types to be cached separately is specified in the SeparatelyCachedTagTypes property.
 * The standard implementation caches only COMMENT tag types separately, as these tag types are searched extensively
 * in the process of ensuring that every non-server tag is not located inside a comment.
 */
final class Cache {
	public final Source source;
	private final SubCache allTagTypesSubCache;
	private final SubCache[] subCaches; // contains allTagTypesSubCache plus a SubCache object for each separately cached tag type

	public Cache(final Source source) {
		this.source=source;
		allTagTypesSubCache=new SubCache(this,null);
		TagType[] separatelyCachedTagTypes=getSeparatelyCachedTagTypes();
		subCaches=new SubCache[separatelyCachedTagTypes.length+1];
		subCaches[0]=allTagTypesSubCache;
		for (int i=0; i