src/dom/DOM_DOMImplementation.cpp

/*
 * The Apache Software License, Version 1.1
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/**
 * $Log$
 * Revision 1.1  1999/11/09 01:08:56  twl
 * Initial revision
 *
 * Revision 1.3  1999/11/08 20:44:15  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */

#include "DOM_DOMImplementation.hpp"
#include "DOM_Document.hpp"
#include "DOM_DocumentType.hpp"
#include "DOM_DOMException.hpp"
#include "DocumentImpl.hpp"
#include "DocumentTypeImpl.hpp"
#include "DStringPool.hpp"
#include "util/PlatformUtils.hpp"

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

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

static DOMString                *gXML;      // Points to "XML"
static DOMString                *gxml;      // Points to "xml"
static DOMString                *g1_0;      // Points to "1.0"


// Note #1136 - There needs to be a separate implementation class for
//              DOMImplementation, so that the user programming model
//              is consistent with the rest of the C++ DOM API, and
//              so that hasFeature will only work on the result of
//              getImplementation(), and not on DOM_DOMImplemenation objects
//              created with the default constructor.
//
DOM_DOMImplementation::DOM_DOMImplementation() {
};



DOM_DOMImplementation::DOM_DOMImplementation(const DOM_DOMImplementation & other)
{
};


DOM_DOMImplementation::~DOM_DOMImplementation()
{
};


DOM_DOMImplementation & DOM_DOMImplementation::operator = (const DOM_DOMImplementation & other)
{
    return *this;
};


//  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.
//
DOM_DOMImplementation &DOM_DOMImplementation::getImplementation() {
    if (gDomimp == 0)
    {
        DOM_DOMImplementation *t = new DOM_DOMImplementation;
        if (XMLPlatformUtils::compareAndSwap((void **)&gDomimp, t, 0) != 0)
            delete t;
    }
    return *gDomimp;
};


bool  DOM_DOMImplementation::hasFeature(const DOMString &feature,  const DOMString &version) 
{
    // Currently, we support only XML Level 1 version 1.0
    // Note #965:  A true case-insensitve compare is needed here.
    if(feature.equals(DStringPool::getStaticString("XML", &gXML)) ||
       feature.equals(DStringPool::getStaticString("xml", &gxml)))
    {
        if(version.equals(DStringPool::getStaticString("1.0", &g1_0)))
            return true;
    }
    return false;
}


//Introduced in DOM Level 2

DOM_DocumentType DOM_DOMImplementation::createDocumentType(const DOMString &qualifiedName,
	const DOMString &publicID, const DOMString &systemID,
	const DOMString &internalSubset)
{
    if (!DocumentImpl::isXMLName(qualifiedName))
        throw new DOM_DOMException(
        DOM_DOMException::INVALID_CHARACTER_ERR, null);
    
    return DOM_DocumentType(new DocumentTypeImpl(qualifiedName, publicID, systemID, internalSubset));
}

DOM_Document DOM_DOMImplementation::createDocument(const DOMString &namespaceURI,
	const DOMString &qualifiedName, const DOM_DocumentType &doctype)
{
    return DOM_Document(new DocumentImpl(namespaceURI, qualifiedName,
	doctype == null ? null : (DocumentTypeImpl *) doctype.fImpl));
}