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/*
 * Copyright (C) 2010 Romain Deltour
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library 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 Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */
package org.trancecode.xml.saxon;

import net.sf.saxon.s9api.Axis;
import net.sf.saxon.s9api.Processor;
import net.sf.saxon.s9api.QName;
import net.sf.saxon.s9api.XdmNode;
import net.sf.saxon.s9api.XdmNodeKind;
import net.sf.saxon.s9api.XdmSequenceIterator;
import org.custommonkey.xmlunit.XMLAssert;
import org.testng.Assert;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;
import org.trancecode.AbstractTest;

/**
 * @author Romain Deltour
 */
@Test
public class SaxonBuiderTest extends AbstractTest
{
    private final Processor processor = new Processor(false);
    private SaxonBuilder builder;

    @BeforeMethod
    public void setup()
    {
        builder = new SaxonBuilder(processor.getUnderlyingConfiguration());
    }

    @Test
    public void getNode_nothingBuilt() throws Exception
    {
        Assert.assertNull(builder.getNode(), "unused builder should returned null node");
    }

    @Test
    public void document() throws Exception
    {
        builder.startDocument();
        builder.endDocument();
        final XdmNode result = builder.getNode();
        Assert.assertNotNull(result);
        Assert.assertEquals(result.getNodeKind(), XdmNodeKind.DOCUMENT);
        Assert.assertFalse(result.axisIterator(Axis.CHILD).hasNext());
    }

    @Test
    public void element()
    {
        final XdmNode expected = newDocument("<root/>");
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    @Test
    public void namepsace_default() throws Exception
    {
        final XdmNode expected = newDocument("<root xmlns='ns'/>");
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.namespace("", "ns");
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    @Test
    public void namepsace_nullPrefix() throws Exception
    {
        final XdmNode expected = newDocument("<root xmlns='ns'/>");
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.namespace(null, "ns");
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    @Test
    public void namepsace_multiple() throws Exception
    {
        final XdmNode expected = newDocument("<root xmlns='ns' xmlns:n='ns2'/>");
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.namespace("", "ns");
        builder.namespace("n", "ns2");
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    @Test
    public void attribute()
    {
        final XdmNode expected = newDocument("<root att='value'/>");
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.attribute(new QName("att"), "value");
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    @Test
    public void attribute_namespaced()
    {
        final XdmNode expected = newDocument("<root a:att='value' xmlns:a='ns'/>");
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.namespace("a", "ns");
        builder.attribute(new QName("ns", "a:att"), "value");
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    @Test
    public void content_text()
    {
        final XdmNode expected = newDocument("<root>text</root>");
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.startContent();
        builder.text("text");
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    @Test
    public void content_element()
    {
        final XdmNode expected = newDocument("<root><elem/></root>");
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.startContent();
        builder.startElement(new QName("elem"));
        builder.endElement();
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    @Test
    public void appendNode_asDocument()
    {
        final XdmNode expected = newDocument("<root><elem att='value'><subelem/></elem></root>");
        final XdmNode content = newDocument("<elem att='value'><subelem/></elem>");
        assert content.getNodeKind() == XdmNodeKind.DOCUMENT;
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.startContent();
        builder.nodes(content);
        builder.endElement();
        builder.endDocument();
        final XdmNode result = builder.getNode();
        assertXmlEquals(expected, result, processor);
        final XdmSequenceIterator iter = result.axisIterator(Axis.DESCENDANT);
        while (iter.hasNext())
        {
            final XdmNode node = (XdmNode) iter.next();
            Assert.assertEquals(node.getNodeKind(), XdmNodeKind.ELEMENT);
        }
    }

    @Test
    public void appendNode_asElement()
    {
        final XdmNode expected = newDocument("<root><elem att='value'><subelem/></elem></root>");
        final XdmNode content = (XdmNode) newDocument("<elem att='value'><subelem/></elem>").axisIterator(Axis.CHILD)
                .next();
        assert content.getNodeKind() == XdmNodeKind.ELEMENT;
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.startContent();
        builder.nodes(content);
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    @Test
    public void appendNodes()
    {
        final XdmNode expected = newDocument("<root><elem1/><elem2/></root>");
        final XdmNode content1 = newDocument("<elem1/>");
        final XdmNode content2 = newDocument("<elem2/>");
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.startContent();
        builder.nodes(content1, content2);
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    @Test
    public void comment()
    {
        final XdmNode expected = newDocument("<root><!--comment--></root>");
        builder.startDocument();
        builder.startElement(new QName("root"));
        builder.comment("comment");
        builder.endElement();
        builder.endDocument();
        assertXmlEquals(expected, builder.getNode(), processor);
    }

    private XdmNode newDocument(final String documentString)
    {
        return Saxon.parse(documentString, processor);
    }

    private static void assertXmlEquals(final XdmNode expected, final XdmNode actual, final Processor processor)
    {
        assert expected != null;
        assert actual != null;
        final XdmNode docExpected = Saxon.asDocumentNode(expected, processor);
        final XdmNode docActual = Saxon.asDocumentNode(actual, processor);
        final String message = String.format("expected:\n%s\nactual:\n%s", docExpected, docActual);
        try
        {
            XMLAssert.assertXMLEqual(message, docExpected.toString(), docActual.toString());
        }
        catch (final Exception e)
        {
            throw new IllegalStateException(message, e);
        }
    }
}
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