itextpdf-master/itext/src/main/java/com/itextpdf/text/pdf/PdfPage.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
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package com.itextpdf.text.pdf;
import java.util.HashMap;

import com.itextpdf.text.DocumentException;
import com.itextpdf.text.error_messages.MessageLocalization;
/**
 * <CODE>PdfPage</CODE> is the PDF Page-object.
 * <P>
 * A Page object is a dictionary whose keys describe a single page containing text,
 * graphics, and images. A Page object is a leaf of the Pages tree.<BR>
 * This object is described in the 'Portable Document Format Reference Manual version 1.3'
 * section 6.4 (page 73-81)
 *
 * @see		PdfPages
 */

public class PdfPage extends PdfDictionary {

    private static final String boxStrings[] = {"crop", "trim", "art", "bleed"};
    private static final PdfName boxNames[] = {PdfName.CROPBOX, PdfName.TRIMBOX, PdfName.ARTBOX, PdfName.BLEEDBOX};
    // membervariables

/** value of the <B>Rotate</B> key for a page in PORTRAIT */
    public static final PdfNumber PORTRAIT = new PdfNumber(0);

/** value of the <B>Rotate</B> key for a page in LANDSCAPE */
    public static final PdfNumber LANDSCAPE = new PdfNumber(90);

/** value of the <B>Rotate</B> key for a page in INVERTEDPORTRAIT */
    public static final PdfNumber INVERTEDPORTRAIT = new PdfNumber(180);

/**	value of the <B>Rotate</B> key for a page in SEASCAPE */
    public static final PdfNumber SEASCAPE = new PdfNumber(270);

/** value of the <B>MediaBox</B> key */
    PdfRectangle mediaBox;

    // constructors

/**
 * Constructs a <CODE>PdfPage</CODE>.
 *
 * @param		mediaBox		a value for the <B>MediaBox</B> key
 * @param		resources		an indirect reference to a <CODE>PdfResources</CODE>-object
 * @param		rotate			a value for the <B>Rotate</B> key
 * @throws DocumentException 
 */

    PdfPage(PdfRectangle mediaBox, HashMap<String, PdfRectangle> boxSize, PdfDictionary resources, int rotate) throws DocumentException {
        super(PAGE);
        this.mediaBox = mediaBox;
        if (mediaBox != null && (mediaBox.width() > 14400 || mediaBox.height() > 14400)) {
        	throw new DocumentException(MessageLocalization.getComposedMessage("the.page.size.must.be.smaller.than.14400.by.14400.its.1.by.2", mediaBox.width(), mediaBox.height()));
        }
        put(PdfName.MEDIABOX, mediaBox);
        put(PdfName.RESOURCES, resources);
        if (rotate != 0) {
            put(PdfName.ROTATE, new PdfNumber(rotate));
        }
        for (int k = 0; k < boxStrings.length; ++k) {
            PdfObject rect = boxSize.get(boxStrings[k]);
            if (rect != null)
                put(boxNames[k], rect);
        }
    }

/**
 * Constructs a <CODE>PdfPage</CODE>.
 *
 * @param		mediaBox		a value for the <B>MediaBox</B> key
 * @param		resources		an indirect reference to a <CODE>PdfResources</CODE>-object
 * @throws DocumentException 
 */

    PdfPage(PdfRectangle mediaBox, HashMap<String, PdfRectangle> boxSize, PdfDictionary resources) throws DocumentException {
        this(mediaBox, boxSize, resources, 0);
    }

/**
 * Checks if this page element is a tree of pages.
 * <P>
 * This method always returns <CODE>false</CODE>.
 *
 * @return	<CODE>false</CODE> because this is a single page
 */

    public boolean isParent() {
        return false;
    }

    // methods

/**
 * Adds an indirect reference pointing to a <CODE>PdfContents</CODE>-object.
 *
 * @param		contents		an indirect reference to a <CODE>PdfContents</CODE>-object
 */

    void add(PdfIndirectReference contents) {
        put(PdfName.CONTENTS, contents);
    }

/**
 * Rotates the mediabox, but not the text in it.
 *
 * @return		a <CODE>PdfRectangle</CODE>
 */

    PdfRectangle rotateMediaBox() {
        this.mediaBox =  mediaBox.rotate();
        put(PdfName.MEDIABOX, this.mediaBox);
        return this.mediaBox;
    }

/**
 * Returns the MediaBox of this Page.
 *
 * @return		a <CODE>PdfRectangle</CODE>
 */

    PdfRectangle getMediaBox() {
        return mediaBox;
    }
}
