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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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/*
 * $Id: PdfFormXObject.java 3903 2009-04-24 10:03:48Z blowagie $
 *
 * Copyright 2001, 2002 Bruno Lowagie
 *
 * 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;

/**
 * PdfFormObject is a type of XObject containing a template-object.
 */

class PdfFormXObject extends PdfStream {

    // public static final variables



/** This is a PdfNumber representing 1. */
    private static final PdfNumber ONE = new PdfNumber(1);

/** This is the 1 - matrix. */
    private static final PdfLiteral MATRIX = new PdfLiteral("[1 0 0 1 0 0]");

/**
 * Constructs a PdfFormXObject-object.
 *
 * @param	template			the template
 * @param	compressionLevel	the compression level for the stream
 * @since	2.1.3 (Replacing the existing constructor with param compressionLevel)
 */

    PdfFormXObject(final PdfTemplate template, final int compressionLevel) // throws BadPdfFormatException
    {
        super();
        put(PdfName.TYPE, PdfName.XOBJECT);
        put(PdfName.SUBTYPE, PdfName.FORM);
        put(PdfName.RESOURCES, template.getResources());
        put(PdfName.BBOX, new PdfRectangle(template.getBoundingBox()));
        put(PdfName.FORMTYPE, ONE);
        if (template.getLayer() != null) {
			put(PdfName.OC, template.getLayer().getRef());
		}
        if (template.getGroup() != null) {
			put(PdfName.GROUP, template.getGroup());
		}
        final PdfArray matrix = template.getMatrix();
        if (matrix == null) {
			put(PdfName.MATRIX, MATRIX);
		} else {
			put(PdfName.MATRIX, matrix);
		}
        this.bytes = template.toPdf(null);
        put(PdfName.LENGTH, new PdfNumber(this.bytes.length));
        flateCompress(compressionLevel);
    }

}