poi-ooxml/src/test/java/org/apache/poi/xwpf/usermodel/TestXWPFSDT.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.xwpf.usermodel;

import static org.apache.poi.POITestCase.assertContains;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.xwpf.XWPFTestDataSamples;
import org.junit.jupiter.api.Test;

public final class TestXWPFSDT {

    /**
     * Test text extraction from nested SDTs
     */
    @Test
    void testNestedSDTs() throws Exception {
        try (XWPFDocument doc = XWPFTestDataSamples.openSampleDocument("Bug64561.docx")) {
            XWPFAbstractSDT sdt = extractAllSDTs(doc).get(0);
            assertEquals("Subject", sdt.getContent().getText(), "extracted text");
        }
    }

    /**
     * Test simple tag and title extraction from SDT
     */
    @Test
    void testTagTitle() throws Exception {
        try (XWPFDocument doc =XWPFTestDataSamples.openSampleDocument("Bug54849.docx")) {
            String tag = null;
            String title = null;
            List<XWPFAbstractSDT> sdts = extractAllSDTs(doc);
            for (XWPFAbstractSDT sdt : sdts) {
                if (sdt.getContent().toString().equals("Rich_text")) {
                    tag = "MyTag";
                    title = "MyTitle";
                    break;
                }

            }
            assertEquals(13, sdts.size(), "controls size");

            assertEquals("MyTag", tag, "tag");
            assertEquals("MyTitle", title, "title");
        }
    }

    @Test
    void testGetSDTs() throws Exception {
        String[] contents = new String[]{
                "header_rich_text",
                "Rich_text",
                "Rich_text_pre_table\nRich_text_cell1\t\t\t\n\t\t\t\n\t\t\t\n\nRich_text_post_table",
                "Plain_text_no_newlines",
                "Plain_text_with_newlines1\nplain_text_with_newlines2",
                "Watermelon",
                "Dirt",
                "4/16/2013",
                "Rich_text_in_cell",
                "rich_text_in_paragraph_in_cell",
                "Footer_rich_text",
                "Footnote_sdt",
                "Endnote_sdt"

        };
        try (XWPFDocument doc =XWPFTestDataSamples.openSampleDocument("Bug54849.docx")) {
            List<XWPFAbstractSDT> sdts = extractAllSDTs(doc);

            assertEquals(contents.length, sdts.size(), "number of sdts");

            for (int i = 0; i < contents.length; i++) {
                XWPFAbstractSDT sdt = sdts.get(i);
                assertEquals(contents[i], sdt.getContent().toString(), i + ": " + contents[i]);
            }
        }
    }

    /**
     * POI-54771 and TIKA-1317
     */
    @Test
    void testSDTAsCell() throws Exception {
        //Bug54771a.docx and Bug54771b.docx test slightly
        //different recursion patterns. Keep both!
        try (XWPFDocument doc = XWPFTestDataSamples.openSampleDocument("Bug54771a.docx")) {
            List<XWPFAbstractSDT> sdts = extractAllSDTs(doc);
            String text = sdts.get(0).getContent().getText();
            assertEquals(2, sdts.size());
            assertContains(text, "Test");

            text = sdts.get(1).getContent().getText();
            assertContains(text, "Test Subtitle");
            assertContains(text, "Test User");
            assertTrue(text.indexOf("Test") < text.indexOf("Test Subtitle"));
        }

        try (XWPFDocument doc = XWPFTestDataSamples.openSampleDocument("Bug54771b.docx")) {
             List<XWPFAbstractSDT> sdts = extractAllSDTs(doc);
            assertEquals(3, sdts.size());
            assertContains(sdts.get(0).getContent().getText(), "Test");

            assertContains(sdts.get(1).getContent().getText(), "Test Subtitle");
            assertContains(sdts.get(2).getContent().getText(), "Test User");
        }
    }

    /**
     * POI-55142 and Tika 1130
     */
    @Test
    void testNewLinesBetweenRuns() throws Exception {
        try (XWPFDocument doc =XWPFTestDataSamples.openSampleDocument("Bug55142.docx")) {
            List<XWPFAbstractSDT> sdts = extractAllSDTs(doc);
            List<String> targs = new ArrayList<>();
            //these test newlines and tabs in paragraphs/body elements
            targs.add("Rich-text1 abcdefghi");
            targs.add("Rich-text2 abcd\t\tefgh");
            targs.add("Rich-text3 abcd\nefg");
            targs.add("Rich-text4 abcdefg");
            targs.add("Rich-text5 abcdefg\nhijk");
            targs.add("Plain-text1 abcdefg");
            targs.add("Plain-text2 abcdefg\nhijk\nlmnop");
            //this tests consecutive runs within a cell (not a paragraph)
            //this test case was triggered by Tika-1130
            targs.add("sdt_incell2 abcdefg");

            for (int i = 0; i < sdts.size(); i++) {
                XWPFAbstractSDT sdt = sdts.get(i);
                assertEquals(targs.get(i), sdt.getContent().getText());
            }
        }
    }

    @Test
    void test60341() throws IOException {
        //handle sdtbody without an sdtpr
        try (XWPFDocument doc =XWPFTestDataSamples.openSampleDocument("Bug60341.docx")) {
            List<XWPFAbstractSDT> sdts = extractAllSDTs(doc);
            assertEquals(1, sdts.size());
            assertEquals("", sdts.get(0).getTag());
            assertEquals("", sdts.get(0).getTitle());
        }
    }

    @Test
    void test62859() throws IOException {
        //this doesn't test the exact code path for this issue, but
        //it does test for a related issue, and the fix fixes both.
        //We should try to add the actual triggering document
        //to our test suite.
        try (XWPFDocument doc =XWPFTestDataSamples.openSampleDocument("Bug62859.docx")) {
            List<XWPFAbstractSDT> sdts = extractAllSDTs(doc);
            assertEquals(1, sdts.size());
            assertEquals("", sdts.get(0).getTag());
            assertEquals("", sdts.get(0).getTitle());
        }
    }

    private List<XWPFAbstractSDT> extractAllSDTs(XWPFDocument doc) {
        List<XWPFAbstractSDT> sdts = new ArrayList<>();

        List<XWPFHeader> headers = doc.getHeaderList();
        for (XWPFHeader header : headers) {
            sdts.addAll(extractSDTsFromBodyElements(header.getBodyElements()));
        }
        sdts.addAll(extractSDTsFromBodyElements(doc.getBodyElements()));

        List<XWPFFooter> footers = doc.getFooterList();
        for (XWPFFooter footer : footers) {
            sdts.addAll(extractSDTsFromBodyElements(footer.getBodyElements()));
        }

        for (XWPFFootnote footnote : doc.getFootnotes()) {
            sdts.addAll(extractSDTsFromBodyElements(footnote.getBodyElements()));
        }
        for (XWPFEndnote footnote : doc.getEndnotes()) {
            sdts.addAll(extractSDTsFromBodyElements(footnote.getBodyElements()));
        }
        return sdts;
    }

    private List<XWPFAbstractSDT> extractSDTsFromBodyElements(List<IBodyElement> elements) {
        List<XWPFAbstractSDT> sdts = new ArrayList<>();
        for (IBodyElement e : elements) {
            if (e instanceof XWPFSDT) {
                XWPFSDT sdt = (XWPFSDT) e;
                sdts.add(sdt);
            } else if (e instanceof XWPFParagraph) {

                XWPFParagraph p = (XWPFParagraph) e;
                for (IRunElement e2 : p.getIRuns()) {
                    if (e2 instanceof XWPFSDT) {
                        XWPFSDT sdt = (XWPFSDT) e2;
                        sdts.add(sdt);
                    }
                }
            } else if (e instanceof XWPFTable) {
                XWPFTable table = (XWPFTable) e;
                sdts.addAll(extractSDTsFromTable(table));
            }
        }
        return sdts;
    }

    private List<XWPFAbstractSDT> extractSDTsFromTable(XWPFTable table) {

        List<XWPFAbstractSDT> sdts = new ArrayList<>();
        for (XWPFTableRow r : table.getRows()) {
            for (ICell c : r.getTableICells()) {
                if (c instanceof XWPFSDTCell) {
                    sdts.add((XWPFSDTCell) c);
                } else if (c instanceof XWPFTableCell) {
                    sdts.addAll(extractSDTsFromBodyElements(((XWPFTableCell) c).getBodyElements()));
                }
            }
        }
        return sdts;
    }
}