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package fourty2ia.builder;

import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import static org.junit.Assert.*;

import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerException;
import java.io.StringWriter;

public class XmlDocumentBuilderTest {

    @Test
    public void testBeginEndElement() throws Exception {
        XmlDocumentBuilder builder = new XmlDocumentBuilder();

        Document doc = builder
                .beginElement("foo")
                    .beginElement("bar")
                    .endElement()
                .endElement()
                .build();
        
        assertNotNull(doc);
        Element root = doc.getDocumentElement();
        assertNotNull(root);
        assertEquals("foo",root.getNodeName());
        assertEquals(1,root.getChildNodes().getLength());
        assertEquals("bar",root.getChildNodes().item(0).getNodeName());
    }

    @Test(expected = IllegalStateException.class)
    public void testTooManyEnds() throws Exception {
        XmlDocumentBuilder builder = new XmlDocumentBuilder();

        builder.beginElement("foo")
                    // oh oh, missing begin
                    .endElement()
                .endElement()
                .build();
    }

    @Test
    public void testAttr() throws Exception {
        XmlDocumentBuilder builder = new XmlDocumentBuilder();

        Document doc = builder
                .beginElement("foo")
                    .attr("bar","whazzup")
                    .attr("number",1)
                .endElement()
                .build();

        assertNotNull(doc);
        Element root = doc.getDocumentElement();
        assertNotNull(root);
        assertEquals("whazzup",root.getAttribute("bar"));
        assertEquals("1",root.getAttribute("number"));
        assertFalse(root.hasAttribute("notHere"));
    }

    @Test
    public void testComplexDocument() throws Exception {
        XmlDocumentBuilder builder = new XmlDocumentBuilder();
        Document doc = builder
                .beginElement("html")
                    .beginElement("head")
                    .endElement()
                    .beginElement("body")
                        .beginElement("h1")
                            .text("42 Incorrect Answers")
                        .endElement()
                        .text("Just click this ")
                        .beginElement("a")
                            .attr("href","http://42-incorrect-answers.blogspot.com/")
                            .text("link")
                        .endElement()
                    .endElement()
                .endElement()
                .build();
        assertEquals(
            "<html><head/><body><h1>42 Incorrect Answers</h1>" +
                    "Just click this <a href=\"http://42-incorrect-answers.blogspot.com/\">" +
                    "link</a></body></html>",
                convertDocToString(doc));
    }

    private String convertDocToString(Document doc) throws TransformerException {

        TransformerFactory transfac = TransformerFactory.newInstance();
        Transformer trans = transfac.newTransformer();
        trans.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
        // we don't want <META http-equiv="Content-Type"... to ease testing
        trans.setOutputProperty(OutputKeys.METHOD,"xml");

        StringWriter sw = new StringWriter();
        StreamResult result = new StreamResult(sw);
        DOMSource source = new DOMSource(doc);
        trans.transform(source, result);
        return sw.toString();
    }
}

Change log

r4 by l.girndt on Jul 21, 2009   Diff 
initial example for the builder blog entry
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