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Version modificada de iText 2.1.7 con el paquete cambiado, adaptaciones menores para firma y dependencias actualizadas.
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/*
 * Copyright 2004 by Paulo Soares.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

package com.aowagie.text.pdf;

import java.util.Collection;
import java.util.HashSet;

/**
 * Content typically belongs to a single optional content group,
 * and is visible when the group is ON and invisible when it is OFF. To express more
 * complex visibility policies, content should not declare itself to belong to an optional
 * content group directly, but rather to an optional content membership dictionary
 * represented by this class.
 *
 * @author Paulo Soares ([email protected])
 */
class PdfLayerMembership extends PdfDictionary implements PdfOCG {






    private final PdfIndirectReference ref;
    private final PdfArray members = new PdfArray();
    private final HashSet layers = new HashSet();

    /**
     * Creates a new, empty, membership layer.
     * @param writer the writer
     */
    public PdfLayerMembership(final PdfWriter writer) {
        super(PdfName.OCMD);
        put(PdfName.OCGS, this.members);
        this.ref = writer.getPdfIndirectReference();
    }

    /**
     * Gets the PdfIndirectReference that represents this membership layer.
     * @return the PdfIndirectReference that represents this layer
     */
    @Override
	public PdfIndirectReference getRef() {
        return this.ref;
    }



    /**
     * Gets the member layers.
     * @return the member layers
     */
    public Collection getLayers() {
        return this.layers;
    }

    /**
     * Sets the visibility policy for content belonging to this
     * membership dictionary. Possible values are ALLON, ANYON, ANYOFF and ALLOFF.
     * The default value is ANYON.
     * @param type the visibility policy
     */
    public void setVisibilityPolicy(final PdfName type) {
        put(PdfName.P, type);
    }

    /**
     * Gets the dictionary representing the membership layer. It just returns this.
     * @return the dictionary representing the layer
     */
    @Override
	public PdfObject getPdfObject() {
        return this;
    }
}