itextpdf-master/xtra/src/main/java/com/itextpdf/text/pdf/mc/StructureItem.java
/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2022 iText Group NV
 * Authors: Bruno Lowagie, 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
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 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
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 * a covered work must retain the producer line in every PDF that is created
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 *
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 */
package com.itextpdf.text.pdf.mc;

/**
 * The abstract StructureItem class is extended by StructureMCID and StructureObject.
 */
public abstract class StructureItem {
	
	/** The object number of the page to which this structure item belongs. */
	protected int pageref = -1;

	/**
	 * Returns the number of the page object to which the structure item belongs.
	 * @return a number of the reference of a page
	 */
	public int getPageref() {
		return pageref;
	}
	
	/**
	 * Checks if an MCID corresponds with the MCID stored in the StructureItem.
	 * @param pageref	the page reference that needs to be checked
	 * @param mcid		the MCID that needs to be checked
	 * @return  0 in case there's no MCID (in case of a StructureObject),
	 * 		    1 in case the MCID matches,
	 * 		   -1 in case there's no match.
	 */
	public int checkMCID(int pageref, int mcid) {
		return 0;
	}
	
	/**
	 * Checks if a StructParent corresponds with the StructParent stored in the StructureItem.
	 * @param pageref	the page reference that needs to be checked
	 * @param structParent	the structParent that needs to be checked
	 * @return  0 in case there's no StructParent (in case of a StructureMCID)
	 *          1 in case the StructParent matches,
	 *         -1 in case there's no match.
	 */
	public int checkStructParent(int pageref, int structParent) {
		return 0;
	}
}
