samples/CreateDOMDocument/CreateDOMDocument.cpp

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 * The Apache Software License, Version 1.1
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 * reserved.
 *
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 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
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 * individuals on behalf of the Apache Software Foundation, and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
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/*
 * $Id$
 */

/*
 * This sample illustrates how you can create a DOM tree in memory.
 * It then prints the count of elements in the tree.
 */


// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/util/XMLString.hpp>
#include <xercesc/dom/DOM.hpp>
#include <iostream.h>

// ---------------------------------------------------------------------------
//  This is a simple class that lets us do easy (though not terribly efficient)
//  trancoding of char* data to XMLCh data.
// ---------------------------------------------------------------------------
class XStr
{
public :
    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    XStr(const char* const toTranscode)
    {
        // Call the private transcoding method
        fUnicodeForm = XMLString::transcode(toTranscode);
    }

    ~XStr()
    {
        delete [] fUnicodeForm;
    }


    // -----------------------------------------------------------------------
    //  Getter methods
    // -----------------------------------------------------------------------
    const XMLCh* unicodeForm() const
    {
        return fUnicodeForm;
    }

private :
    // -----------------------------------------------------------------------
    //  Private data members
    //
    //  fUnicodeForm
    //      This is the Unicode XMLCh format of the string.
    // -----------------------------------------------------------------------
    XMLCh*   fUnicodeForm;
};

#define X(str) XStr(str).unicodeForm()


// ---------------------------------------------------------------------------
//  main
// ---------------------------------------------------------------------------

int main(int argC, char* argV[])
{
    // Initialize the XML4C2 system.
    try
    {
        XMLPlatformUtils::Initialize();
    }

    catch(const XMLException& toCatch)
    {
        char *pMsg = XMLString::transcode(toCatch.getMessage());
        cerr << "Error during Xerces-c Initialization.\n"
             << "  Exception message:"
             << pMsg;
        delete [] pMsg;
        return 1;
    }

    // Watch for special case help request
    if (argC > 1)
    {
        cout << "\nUsage:\n"
                "    CreateDOMDocument\n\n"
                "This program creates a new DOM document from scratch in memory.\n"
                "It then prints the count of elements in the tree.\n"
             <<  endl;
        XMLPlatformUtils::Terminate();
        return 1;
    }

    {
        //  Nest entire test in an inner block.
        //  The tree we create below is the same that the XercesDOMParser would
        //  have created, except that no whitespace text nodes would be created.

        // <company>
        //     <product>Xerces-C</product>
        //     <category idea='great'>XML Parsing Tools</category>
        //     <developedBy>Apache Software Foundation</developedBy>
        // </company>

        DOMImplementation* impl =  DOMImplementationRegistry::getDOMImplementation(X("Core"));

        DOMDocument* doc = impl->createDocument(
                    0,                    // root element namespace URI.
                    X("company"),         // root element name
                    0);                   // document type object (DTD).

        DOMElement* rootElem = doc->getDocumentElement();

        DOMElement*  prodElem = doc->createElement(X("product"));
        rootElem->appendChild(prodElem);

        DOMText*    prodDataVal = doc->createTextNode(X("Xerces-C"));
        prodElem->appendChild(prodDataVal);

        DOMElement*  catElem = doc->createElement(X("category"));
        rootElem->appendChild(catElem);

        catElem->setAttribute(X("idea"), X("great"));

        DOMText*    catDataVal = doc->createTextNode(X("XML Parsing Tools"));
        catElem->appendChild(catDataVal);

        DOMElement*  devByElem = doc->createElement(X("developedBy"));
        rootElem->appendChild(devByElem);

        DOMText*    devByDataVal = doc->createTextNode(X("Apache Software Foundation"));
        devByElem->appendChild(devByDataVal);

        //
        // Now count the number of elements in the above DOM tree.
        //

        unsigned int elementCount = doc->getElementsByTagName(X("*"))->getLength();
        cout << "The tree just created contains: " << elementCount
             << " elements." << endl;

        doc->release();

   }

    XMLPlatformUtils::Terminate();
    return 0;
}