/*
 * The OpenSAML License, Version 1.
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 * University Corporation for Advanced Internet Development, Inc.
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 * acknowledgments normally appear.
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 * Inc., nor UCAID may be used to endorse or promote products derived from this
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/* QName.cpp - QName wrapper class

   Scott Cantor
   5/6/02

   $History:$
*/

#include "internal.h"

using namespace saml;
using namespace std;


saml::QName::QName(const XMLCh* nsURI, const XMLCh* localName)
{
    if (!localName || *localName==chNull)
        throw SAMLException("QName() requires local name");
    if (nsURI)
        m_namespace=nsURI;
    m_localName=localName;
}

saml::QName::~QName() {}

const XMLCh* saml::QName::getNamespaceURI() const
{
    return m_namespace.c_str();
}

const XMLCh* saml::QName::getLocalName() const
{
    return m_localName.c_str();
}

saml::QName* saml::QName::getQNameAttribute(DOMElement* e, const XMLCh* nsURI, const XMLCh* localName)
{
    const XMLCh* qval = e->getAttributeNS(nsURI,localName);
    if (!qval || !*qval)
        return NULL;
    return new saml::QName(saml::QName::getNamespaceForQName(qval,e),qval+XMLString::indexOf(qval,chColon) + 1);
}

saml::QName* saml::QName::getQNameTextNode(DOMText* t)
{
    const XMLCh* qval = t->getNodeValue();
    DOMNode* n = t->getParentNode();
    if (!qval || !*qval || !n || n->getNodeType()!=DOMNode::ELEMENT_NODE)
        return NULL;
    return new saml::QName(saml::QName::getNamespaceForQName(qval,static_cast<DOMElement*>(n)),
                            qval+XMLString::indexOf(qval,chColon) + 1);
}

const XMLCh* saml::QName::getNamespaceForQName(const XMLCh* qname, DOMElement* e)
{
    int i;
    if (qname && (i=XMLString::indexOf(qname,chColon))>0)
    {
        auto_ptr<XMLCh> prefix(new XMLCh[i+1]);
        XMLString::subString(prefix.get(),qname,0,i);
        (prefix.get())[i]=chNull;
        return getNamespaceForPrefix(prefix.get(),e);
    }
    return getNamespaceForPrefix(NULL,e);
}

const XMLCh* saml::QName::getNamespaceForPrefix(const XMLCh* prefix, DOMElement* e)
{
    DOMNode* n = e;
    const XMLCh* ns = NULL;

    if (prefix)
    {
        if (!XMLString::compareString(prefix,L(xml)))
            return XML::XML_NS;
        else if (!XMLString::compareString(prefix,L(xmlns)))
            return XML::XMLNS_NS;
    }

    while ((!ns || !*ns) && n && n->getNodeType() == DOMNode::ELEMENT_NODE)
    {
        ns = (static_cast<DOMElement*>(n))->getAttributeNS(XML::XMLNS_NS,prefix ? prefix : L(xmlns));
        n = n->getParentNode();
    }
    return ns;
}

bool saml::operator<(const saml::QName& op1, const saml::QName& op2)
{
    int i=XMLString::compareString(op1.getNamespaceURI(),op2.getNamespaceURI());
    if (i<0)
        return true;
    else if (i==0)
        return (XMLString::compareString(op1.getLocalName(),op2.getLocalName())<0);
    else
        return false;
}