itextpdf-master/itext/src/main/java/com/itextpdf/text/pdf/events/PdfPageEventForwarder.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
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.text.pdf.events;

import java.util.ArrayList;

import com.itextpdf.text.Document;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfPageEvent;
import com.itextpdf.text.pdf.PdfWriter;

/**
 * If you want to add more than one page event to a PdfWriter,
 * you have to construct a PdfPageEventForwarder, add the
 * different events to this object and add the forwarder to
 * the PdfWriter.
 */

public class PdfPageEventForwarder implements PdfPageEvent {

	/** ArrayList containing all the PageEvents that have to be executed. */
	protected ArrayList<PdfPageEvent> events = new ArrayList<PdfPageEvent>();

	/**
	 * Add a page event to the forwarder.
	 * @param event an event that has to be added to the forwarder.
	 */
	public void addPageEvent(PdfPageEvent event) {
		events.add(event);
	}

	/**
	 * Called when the document is opened.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 */
	public void onOpenDocument(PdfWriter writer, Document document) {
		for (PdfPageEvent event: events) {
			event.onOpenDocument(writer, document);
		}
	}

	/**
	 * Called when a page is initialized.
	 * <P>
	 * Note that if even if a page is not written this method is still called.
	 * It is preferable to use <CODE>onEndPage</CODE> to avoid infinite loops.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 */
	public void onStartPage(PdfWriter writer, Document document) {
		for (PdfPageEvent event: events) {
			event.onStartPage(writer, document);
		}
	}

	/**
	 * Called when a page is finished, just before being written to the
	 * document.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 */
	public void onEndPage(PdfWriter writer, Document document) {
		for (PdfPageEvent event: events) {
			event.onEndPage(writer, document);
		}
	}

	/**
	 * Called when the document is closed.
	 * <P>
	 * Note that this method is called with the page number equal to the last
	 * page plus one.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 */
	public void onCloseDocument(PdfWriter writer, Document document) {
		for (PdfPageEvent event: events) {
			event.onCloseDocument(writer, document);
		}
	}

	/**
	 * Called when a Paragraph is written.
	 * <P>
	 * <CODE>paragraphPosition</CODE> will hold the height at which the
	 * paragraph will be written to. This is useful to insert bookmarks with
	 * more control.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 * @param paragraphPosition
	 *            the position the paragraph will be written to
	 */
	public void onParagraph(PdfWriter writer, Document document,
			float paragraphPosition) {
		for (PdfPageEvent event: events) {
			event.onParagraph(writer, document, paragraphPosition);
		}
	}

	/**
	 * Called when a Paragraph is written.
	 * <P>
	 * <CODE>paragraphPosition</CODE> will hold the height of the end of the
	 * paragraph.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 * @param paragraphPosition
	 *            the position of the end of the paragraph
	 */
	public void onParagraphEnd(PdfWriter writer, Document document,
			float paragraphPosition) {
		for (PdfPageEvent event: events) {
			event.onParagraphEnd(writer, document, paragraphPosition);
		}
	}

	/**
	 * Called when a Chapter is written.
	 * <P>
	 * <CODE>position</CODE> will hold the height at which the chapter will be
	 * written to.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 * @param paragraphPosition
	 *            the position the chapter will be written to
	 * @param title
	 *            the title of the Chapter
	 */
	public void onChapter(PdfWriter writer, Document document,
			float paragraphPosition, Paragraph title) {
		for (PdfPageEvent event: events) {
			event.onChapter(writer, document, paragraphPosition, title);
		}
	}

	/**
	 * Called when the end of a Chapter is reached.
	 * <P>
	 * <CODE>position</CODE> will hold the height of the end of the chapter.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 * @param position
	 *            the position of the end of the chapter.
	 */
	public void onChapterEnd(PdfWriter writer, Document document, float position) {
		for (PdfPageEvent event: events) {
			event.onChapterEnd(writer, document, position);
		}
	}

	/**
	 * Called when a Section is written.
	 * <P>
	 * <CODE>position</CODE> will hold the height at which the section will be
	 * written to.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 * @param paragraphPosition
	 *            the position the section will be written to
	 * @param depth
	 *            the number depth of the Section
	 * @param title
	 *            the title of the section
	 */
	public void onSection(PdfWriter writer, Document document,
			float paragraphPosition, int depth, Paragraph title) {
		for (PdfPageEvent event: events) {
			event.onSection(writer, document, paragraphPosition, depth, title);
		}
	}

	/**
	 * Called when the end of a Section is reached.
	 * <P>
	 * <CODE>position</CODE> will hold the height of the section end.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 * @param position
	 *            the position of the end of the section
	 */
	public void onSectionEnd(PdfWriter writer, Document document, float position) {
		for (PdfPageEvent event: events) {
			event.onSectionEnd(writer, document, position);
		}
	}

	/**
	 * Called when a <CODE>Chunk</CODE> with a generic tag is written.
	 * <P>
	 * It is useful to pinpoint the <CODE>Chunk</CODE> location to generate
	 * bookmarks, for example.
	 *
	 * @param writer
	 *            the <CODE>PdfWriter</CODE> for this document
	 * @param document
	 *            the document
	 * @param rect
	 *            the <CODE>Rectangle</CODE> containing the <CODE>Chunk
	 *            </CODE>
	 * @param text
	 *            the text of the tag
	 */
	public void onGenericTag(PdfWriter writer, Document document,
			Rectangle rect, String text) {
		PdfPageEvent event;
		for (Object element : events) {
			event = (PdfPageEvent)element;
			event.onGenericTag(writer, document, rect, text);
		}
	}
}
