/*
* 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.Collection;
import java.util.HashSet;
/**
* 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 final PdfName ALLON = new PdfName("AllOn");
/**
* Visible if any of the entries are <B>ON</B>.
*/
public static final PdfName ANYON = new PdfName("AnyOn");
/**
* Visible if any of the entries are <B>OFF</B>.
*/
public static final PdfName ANYOFF = new PdfName("AnyOff");
/**
* Visible only if all of the entries are <B>OFF</B>.
*/
public static final 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;
}
}