DOMImplementationImpl.cpp

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 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation, and was
 * originally based on software copyright (c) 2001, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
 * on the Apache Software Foundation, please see
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/*
 * $Id$
 */

#include "DOMImplementationImpl.hpp"
#include "DOMDocumentImpl.hpp"
#include "DOMDocumentTypeImpl.hpp"
#include "DOMWriterImpl.hpp"

#include <xercesc/dom/DOMDocument.hpp>
#include <xercesc/dom/DOMDocumentType.hpp>
#include <xercesc/dom/DOMException.hpp>
#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/util/XMLUniDefs.hpp>
#include <xercesc/util/XMLRegisterCleanup.hpp>
#include <xercesc/util/XMLStringTokenizer.hpp>
#include <xercesc/parsers/DOMBuilderImpl.hpp>

// ------------------------------------------------------------
//
//  Static constants.  These are lazily initialized on first usage.
//                     (Static constructors can not be safely used because
//                      of order of initialization dependencies.)
// ------------------------------------------------------------


static DOMImplementationImpl    *gDomimp;   // Points to the singleton instance
                                            //  of DOMImplementation that is returnedreturned
                                            //  by any call to getImplementation().

static const XMLCh  gXML[] =      // Points to "XML"
        {chLatin_X, chLatin_M, chLatin_L, chNull};

static const XMLCh  g1_0[] =     // Points to "1.0"
        {chDigit_1, chPeriod, chDigit_0, chNull};
static const XMLCh  g2_0[] =      // Points to "2.0"
        {chDigit_2, chPeriod, chDigit_0, chNull};
static const XMLCh  g3_0[] =      // Points to "3.0"
        {chDigit_3, chPeriod, chDigit_0, chNull};
static const XMLCh  gTrav[] =     // Points to "Traversal"
        {chLatin_T, chLatin_r, chLatin_a, chLatin_v, chLatin_e, chLatin_r,
            chLatin_s, chLatin_a, chLatin_l, chNull};
static const XMLCh  gCore[] =     // Points to "Core"
        {chLatin_C, chLatin_o, chLatin_r, chLatin_e, chNull};
static const XMLCh  gRange[] =     // Points to "Range"
        {chLatin_R, chLatin_a, chLatin_n, chLatin_g, chLatin_e, 0};
static const XMLCh  gLS[] =     // Points to "LS"
        {chLatin_L, chLatin_S, chNull};


// -----------------------------------------------------------------------
//  Reset the singleton DOMImplementationImpl
// -----------------------------------------------------------------------
static void reinitImplementation()
{
	delete gDomimp;
	gDomimp = 0;
}

//  getImplementation()  - Always returns the same singleton instance, which
//                         is lazily created on the first call.  Note that
//                         DOM_Implementation must be thread-safe because
//                         it is common to all DOM documents, and while a single
//                         document is not thread-safe within itself, we do
//                         promise that different documents can safely be
//                         used concurrently by different threads.
//
DOMImplementationImpl *DOMImplementationImpl::getDOMImplementationImpl() {
	static XMLRegisterCleanup implementationCleanup;

    if (gDomimp == 0)
    {
        DOMImplementationImpl *t = new DOMImplementationImpl;
        if (XMLPlatformUtils::compareAndSwap((void **)&gDomimp, t, 0) != 0)
        {
            delete t;
        }
        else
        {
			implementationCleanup.registerCleanup(reinitImplementation);
        }

    }
    return gDomimp;
};

// ------------------------------------------------------------
// DOMImplementation Virtual interface
// ------------------------------------------------------------
bool  DOMImplementationImpl::hasFeature(const  XMLCh * feature,  const  XMLCh * version) const
{
    if (!feature)
        return false;

    bool anyVersion = (version == 0 || !*version);
    bool version1_0 = XMLString::equals(version, g1_0);
    bool version2_0 = XMLString::equals(version, g2_0);
    bool version3_0 = XMLString::equals(version, g3_0);

    // Currently, we support only XML Level 1 version 1.0
    if (XMLString::compareIString(feature, gXML) == 0
        && (anyVersion || version1_0 || version2_0))
        return true;

    if (XMLString::compareIString(feature, gCore) == 0
        && (anyVersion || version1_0 || version2_0 || version3_0))
        return true;

    if (XMLString::compareIString(feature, gTrav) == 0
        && (anyVersion || version2_0))
        return true;

    if (XMLString::compareIString(feature, gRange) == 0
        && (anyVersion || version2_0))
        return true;

    if (XMLString::compareIString(feature, gLS) == 0
        && (anyVersion || version3_0))
        return true;

    return false;
}


//Introduced in DOM Level 2

DOMDocumentType *DOMImplementationImpl::createDocumentType(const XMLCh *qualifiedName,
	const XMLCh * publicId, const XMLCh *systemId)
{
    if(!DOMDocumentImpl::isXMLName(qualifiedName))
        throw DOMException(DOMException::INVALID_CHARACTER_ERR,0);
    DOMDocumentTypeImpl* docType = new DOMDocumentTypeImpl(0, qualifiedName, publicId, systemId, true);
    return docType;
}

DOMDocument *DOMImplementationImpl::createDocument(const XMLCh *namespaceURI,
	const XMLCh *qualifiedName, DOMDocumentType *doctype)
{
    return new DOMDocumentImpl(namespaceURI, qualifiedName, doctype);
}


// Non-standard extension
DOMDocument *DOMImplementationImpl::createDocument()
{
        return new DOMDocumentImpl();
}

//Introduced in DOM Level 3
DOMImplementation* DOMImplementationImpl::getInterface(const XMLCh* feature){
    throw DOMException(DOMException::NOT_SUPPORTED_ERR, 0);
    return 0;
}

//
//  DOMImplementation::getImplementation.  DOMImplementation is supposed to
//                                              be a pure interface class.  This one static
//                                              function is the hook that lets things get started.
DOMImplementation *DOMImplementation::getImplementation()
{
    return (DOMImplementation*) DOMImplementationImpl::getDOMImplementationImpl();
}

// ------------------------------------------------------------
// DOMImplementationLS Virtual interface
// ------------------------------------------------------------
//Introduced in DOM Level 3
DOMBuilder* DOMImplementationImpl::createDOMBuilder(const short mode,
                                                    const XMLCh* const schemaType)
{
    if (mode == DOMImplementationLS::MODE_ASYNCHRONOUS)
        throw DOMException(DOMException::NOT_SUPPORTED_ERR, 0);

    return new DOMBuilderImpl();
}


DOMWriter* DOMImplementationImpl::createDOMWriter()
{
    return new DOMWriterImpl();
}

DOMInputSource* DOMImplementationImpl::createDOMInputSource()
{
    throw DOMException(DOMException::NOT_SUPPORTED_ERR, 0);
    return 0;
}


// ------------------------------------------------------------
// DOMImplementationSource Virtual interface
// ------------------------------------------------------------
DOMImplementation* DOMImplementationImpl::getDOMImplementation(const XMLCh* features) const
{
    DOMImplementation* impl = DOMImplementation::getImplementation();

    XMLStringTokenizer tokenizer(features);
    const XMLCh* feature = 0;

    while (feature || tokenizer.hasMoreTokens()) {

        if (!feature)
            feature = tokenizer.nextToken();

        const XMLCh* version = 0;
        const XMLCh* token = tokenizer.nextToken();

        if (token && XMLString::isDigit(token[0]))
            version = token;

        if (!impl->hasFeature(feature, version))
            return 0;

        if (!version)
            feature = token;
    }
    return impl;
}