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diff --git a/src/main/java/com/lowagie/text/pdf/PdfLayerMembership.java b/src/main/java/com/lowagie/text/pdf/PdfLayerMembership.java
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--- a/src/main/java/com/lowagie/text/pdf/PdfLayerMembership.java
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@@ -1,139 +0,0 @@
-/*
- * 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.lowagie.text.pdf;
-
-import java.util.HashSet;
-import java.util.Collection;
-
-/**
- * Content typically belongs to a single optional content group,
- * and is visible when the group is <B>ON</B> and invisible when it is <B>OFF</B>. 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 (psoares@consiste.pt)
- */
-public class PdfLayerMembership extends PdfDictionary implements PdfOCG {
-
- /**
- * Visible only if all of the entries are <B>ON</B>.
- */
- public static PdfName ALLON = new PdfName("AllOn");
- /**
- * Visible if any of the entries are <B>ON</B>.
- */
- public static PdfName ANYON = new PdfName("AnyOn");
- /**
- * Visible if any of the entries are <B>OFF</B>.
- */
- public static PdfName ANYOFF = new PdfName("AnyOff");
- /**
- * Visible only if all of the entries are <B>OFF</B>.
- */
- public static PdfName ALLOFF = new PdfName("AllOff");
-
- PdfIndirectReference ref;
- PdfArray members = new PdfArray();
- HashSet layers = new HashSet();
-
- /**
- * Creates a new, empty, membership layer.
- * @param writer the writer
- */
- public PdfLayerMembership(PdfWriter writer) {
- super(PdfName.OCMD);
- put(PdfName.OCGS, members);
- ref = writer.getPdfIndirectReference();
- }
-
- /**
- * Gets the <CODE>PdfIndirectReference</CODE> that represents this membership layer.
- * @return the <CODE>PdfIndirectReference</CODE> that represents this layer
- */
- public PdfIndirectReference getRef() {
- return ref;
- }
-
- /**
- * Adds a new member to the layer.
- * @param layer the new member to the layer
- */
- public void addMember(PdfLayer layer) {
- if (!layers.contains(layer)) {
- members.add(layer.getRef());
- layers.add(layer);
- }
- }
-
- /**
- * Gets the member layers.
- * @return the member layers
- */
- public Collection getLayers() {
- return 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(PdfName type) {
- put(PdfName.P, type);
- }
-
- /**
- * Gets the dictionary representing the membership layer. It just returns <CODE>this</CODE>.
- * @return the dictionary representing the layer
- */
- public PdfObject getPdfObject() {
- return this;
- }
-}