itextpdf-master/itext/src/main/java/com/itextpdf/text/pdf/PdfFormXObject.java
/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2022 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, 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
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
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 */
package com.itextpdf.text.pdf;

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

public class PdfFormXObject extends PdfStream {
    
    // public static final variables
    
/** This is a PdfNumber representing 0. */
    public static final PdfNumber ZERO = new PdfNumber(0);
    
/** This is a PdfNumber representing 1. */
    public static final PdfNumber ONE = new PdfNumber(1);
    
/** This is the 1 - matrix. */
    public static final PdfLiteral MATRIX = new PdfLiteral("[1 0 0 1 0 0]");
    
/**
 * Constructs a <CODE>PdfFormXObject</CODE>-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(PdfTemplate template, 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());
        PdfArray matrix = template.getMatrix();
        if (matrix == null)
            put(PdfName.MATRIX, MATRIX);
        else
            put(PdfName.MATRIX, matrix);
        bytes = template.toPdf(null);
        put(PdfName.LENGTH, new PdfNumber(bytes.length));
        if (template.getAdditional() != null) {
        	putAll(template.getAdditional());
        }
        flateCompress(compressionLevel);
    }
    
}
