PageFlushingHelperUnitTest.java

/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2025 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    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 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 <https://www.gnu.org/licenses/>.
 */
package com.itextpdf.kernel.pdf;

import com.itextpdf.kernel.exceptions.KernelExceptionMessageConstant;
import com.itextpdf.test.ExtendedITextTest;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Tag;

@Tag("UnitTest")
public class PageFlushingHelperUnitTest extends ExtendedITextTest {

    @Test
    public void flushingInUnsafeModeTest() throws IOException {
        int pageToFlush = 1;
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        PdfDocument pdfDocument = new PdfDocument(new PdfWriter(outputStream));
        pdfDocument.addNewPage();
        pdfDocument.close();
        pdfDocument = new PdfDocument(new PdfReader(new ByteArrayInputStream(outputStream.toByteArray())));
        PageFlushingHelper pageFlushingHelper = new PageFlushingHelper(pdfDocument);
        Exception exception = Assertions.assertThrows(IllegalArgumentException.class,
                () -> pageFlushingHelper.unsafeFlushDeep(pageToFlush));
        Assertions.assertEquals(KernelExceptionMessageConstant.FLUSHING_HELPER_FLUSHING_MODE_IS_NOT_FOR_DOC_READING_MODE,
                exception.getMessage());
    }

    @Test
    public void flushingInAppendModeTest() throws IOException {
        int pageToFlush = 1;
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        PdfDocument pdfDocument = new PdfDocument(new PdfWriter(outputStream));
        pdfDocument.addNewPage();
        pdfDocument.close();
        pdfDocument = new PdfDocument(new PdfReader(new ByteArrayInputStream(outputStream.toByteArray())));
        PageFlushingHelper pageFlushingHelper = new PageFlushingHelper(pdfDocument);
        Exception exception = Assertions.assertThrows(IllegalArgumentException.class,
                () -> pageFlushingHelper.appendModeFlush(pageToFlush));
        Assertions.assertEquals(KernelExceptionMessageConstant.FLUSHING_HELPER_FLUSHING_MODE_IS_NOT_FOR_DOC_READING_MODE,
                exception.getMessage());
    }
}