PdfRotator.java example

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sejda-master
/*
 * Copyright 2015 by Andrea Vacondio (andrea.vacondio@gmail.com).
 *
 * This file is part of the Sejda source code
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * 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 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/>.
 */
package org.sejda.impl.sambox.component;

import static org.sejda.model.rotation.Rotation.getRotation;

import org.sejda.model.rotation.Rotation;
import org.sejda.sambox.pdmodel.PDDocument;
import org.sejda.sambox.pdmodel.PDPage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Handles rotations on a given PDDocument.
 * 
 * @author Andrea Vacondio
 * 
 */
public final class PdfRotator {

    private static final Logger LOG = LoggerFactory.getLogger(PdfRotator.class);

    private PDDocument document;

    public PdfRotator(PDDocument document) {
        this.document = document;
    }


    public void rotate(int pageNumber, Rotation rotation) {
        LOG.debug("Applying rotation of {} degrees to page {}", rotation.getDegrees(), pageNumber);
        PDPage page = document.getPage(pageNumber - 1);
        page.setRotation(rotation.addRotation(getRotation(page.getRotation())).getDegrees());
    }
}