/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#if !defined(XALAN_NAMESPACESHANDLER_HEADER_GUARD)
#define XALAN_NAMESPACESHANDLER_HEADER_GUARD


// Base include file.  Must be first.
#include <xalanc/XSLT/XSLTDefinitions.hpp>


#include <xalanc/Include/XalanVector.hpp>
#include <xalanc/Include/XalanMap.hpp>


#include <xalanc/PlatformSupport/DOMStringHelper.hpp>


#include <xalanc/XPath/NameSpace.hpp>
#include <xalanc/XPath/XalanQName.hpp>


namespace XALAN_CPP_NAMESPACE {


class StylesheetConstructionContext;
class StylesheetExecutionContext;


class XALAN_XSLT_EXPORT NamespacesHandler
{
    
public:

    class PrefixChecker
    {
    public:

        PrefixChecker();

        virtual
        ~PrefixChecker();

        virtual bool
        isActive(const XalanDOMString&  thePrefix) const = 0;
    };

    class XALAN_XSLT_EXPORT Namespace
    {
    public:

        Namespace() :
            m_prefix(&s_emptyString),
            m_uri(&s_emptyString)
        {
        }

        Namespace(
                    const XalanDOMString&   prefix,
                    const XalanDOMString&   uri) :
            m_prefix(&prefix),
            m_uri(&uri)
        {
        }

        /**
         * Retrieve the prefix for namespace
         * 
         * @return prefix string
         */
        const XalanDOMString&
        getPrefix() const
        {
            assert(m_prefix != 0);

            return *m_prefix;
        }

        /**
         * Set the prefix for namespace
         * 
         * @param prefix The new prefix value
         */
        void
        setPrefix(const XalanDOMString&     prefix)
        {
            m_prefix = &prefix;
        }

        /**
         * Retrieve the URI for namespace
         * 
         * @return URI string
         */
        const XalanDOMString&
        getURI() const
        {
            assert(m_uri != 0);

            return *m_uri;
        }

        /**
         * Set the URI for namespace
         * 
         * @param uri The new uri value
         */
        void
        setURI(const XalanDOMString&    uri)
        {
            m_uri = &uri;
        }

    protected:

        static const XalanDOMString     s_emptyString;

    private:

        const XalanDOMString*   m_prefix;

        const XalanDOMString*   m_uri;
    };

    class XALAN_XSLT_EXPORT NamespaceExtended : public Namespace
    {
    public:

        NamespaceExtended() :
            Namespace(),
            m_resultAttributeName(&s_emptyString)
        {
        }

        NamespaceExtended(
                    const XalanDOMString&   prefix,
                    const XalanDOMString&   uri) :
            Namespace(prefix, uri),
            m_resultAttributeName(&s_emptyString)
        {
        }

        /**
         * Retrieve the name of the result attribute.
         * 
         * @return name string
         */
        const XalanDOMString&
        getResultAttributeName() const
        {
            assert(m_resultAttributeName != 0);

            return *m_resultAttributeName;
        }

        /**
         * Set the name of the result attribute.
         * 
         * @param name The new name value
         */
        void
        setResultAttributeName(const XalanDOMString&    name)
        {
            m_resultAttributeName = &name;
        }

    private:

        const XalanDOMString*   m_resultAttributeName;
    };

    typedef XalanQName::NamespaceVectorType             NamespaceVectorType;
    typedef XalanQName::NamespacesStackType             NamespacesStackType;

    typedef XalanVector<Namespace>                      NamespacesVectorType;
    typedef XalanVector<NamespaceExtended>              NamespaceExtendedVectorType;
    typedef XalanVector<const XalanDOMString*>          XalanDOMStringPointerVectorType;

    typedef XalanMap<const XalanDOMString*,
                    const XalanDOMString*>              NamespaceAliasesMapType;


    /**
     * Create a default, empty instance.
     */
    explicit
    NamespacesHandler(MemoryManager&    theManager);

    /**
     * Create an instance namespace handler using the
     * current namespaces in effect.
     *
     * @param theConstructionContext The current construction context.
     * @param stylesheetNamespacesHandler The stylesheet's handler.
     * @param theCurrentNamespaces The stack of active namespace declarations.
     * @param theXSLTNamespaceURI The namespace URI for XSLT.
     */
    NamespacesHandler(
            StylesheetConstructionContext&  theConstructionContext,
            const NamespacesHandler&        stylesheetNamespacesHandler,
            const NamespacesStackType&      theCurrentNamespaces,
            const XalanDOMString&           theXSLTNamespaceURI);

    ~NamespacesHandler();

    /**
     * Process an exclude-result-prefixes attribute.
     *
     * @param theConstructionContext The current construction context.
     * @param theValue The attribute's value.
     * @param theCurrentNamespaces The stack of active namespace declarations.
     */
    void
    processExcludeResultPrefixes(
            StylesheetConstructionContext&  theConstructionContext,
            const XalanDOMChar*             theValue,
            const NamespacesStackType&      theCurrentNamespaces);

    /**
     * Process an extension-element-prefixes attribute.
     *
     * @param theConstructionContext The current construction context.
     * @param theValue The attribute's value.
     * @param theCurrentNamespaces The stack of active namespace declarations.
     */
    void
    processExtensionElementPrefixes(
            StylesheetConstructionContext&  theConstructionContext,
            const XalanDOMChar*             theValue,
            const NamespacesStackType&      theCurrentNamespaces);

    /**
     * Notify the instance that the stylesheet is fully constructed.
     *
     * @param theConstructionContext The current construction context.
     * @param fProcessNamespaceAliases If true, process any namespace aliases
     * @param theElementName The name of the owning element.
     * @param parentNamespacesHandler The parent handler, if any.
     * @param prefixChecker A pointer to a PrefixChecker instance to use, if any.
     */
    void
    postConstruction(
            StylesheetConstructionContext&  theConstructionContext,
            bool                            fProcessNamespaceAliases = true,
            const XalanDOMString&           theElementName = XalanDOMString(XalanMemMgrs::getDummyMemMgr()),
            const NamespacesHandler*        parentNamespacesHandler = 0,
            const PrefixChecker*            prefixChecker = 0);

    NamespacesHandler&
    operator=(const NamespacesHandler&  theRHS);

    /**
     * Determine of a given namespace should be excluded.
     *
     * @param theXSLTNamespaceURI The namespace URI for XSLT.
     * @param theURI The namespace URI.
     * @return true of the namespace should be excluded, false if not.
     */
    bool
    shouldExcludeResultNamespaceNode(
            const XalanDOMString&   theXSLTNamespaceURI,
            const XalanDOMString&   theURI) const;

    /**
     * Add a URI as an extension namespace prefixes.
     *
     * @param theConstructionContext The current construction context.
     * @param theURI The namespace URI.
     */
    void
    addExtensionNamespaceURI(
            StylesheetConstructionContext&  theConstructionContext,
            const XalanDOMString&   theURI);

    /**
     * Get the namespace URI for the given prefix.
     *
     * @param thePrefix The namespace prefix.
     * @return The namespace URI
     */
    const XalanDOMString*
    getNamespace(const XalanDOMString&  thePrefix) const;

    /**
     * Get the namespace alias URI for the given namespace.
     *
     * @param theStylesheetNamespace The namespace as declared in the stylesheet.
     * @return The namespace alias URI
     */
    const XalanDOMString*
    getNamespaceAlias(const XalanDOMString&     theStylesheetNamespace) const;

    /**
     * Set the namespace alias URI for the given namespace.
     *
     * @param theConstructionContext The current construction context.
     * @param theStylesheetNamespace The namespace as declared in the stylesheet.
     * @param theResultNamespace The namespace as it should appear in the result tree.
     */
    void
    setNamespaceAlias(
            StylesheetConstructionContext&  theConstructionContext,
            const XalanDOMString&           theStylesheetNamespace,
            const XalanDOMString&           theResultNamespace);

    /**
     * Copy the aliases from the given NamespacesHandler.
     *
     * @param parentNamespacesHandler The parent handler.
     */
    void
    copyNamespaceAliases(const NamespacesHandler&   parentNamespacesHandler);

    /**
     * Output the result tree namespace declarations.
     *
     * @param theExecutionContext The current execution context.
     * @param supressDefault If true, any default namespace declaration will not be output.
     */
    void
    outputResultNamespaces(
            StylesheetExecutionContext&     theExecutionContext,
            bool                            supressDefault = false) const;

    /**
     * Clear out the handler.
     */
    void
    clear();

    /**
     * Swap the contents of this instance with another.
     *
     * @param theOther The other instance.
     */
    void
    swap(NamespacesHandler&     theOther);

    NamespaceExtendedVectorType::size_type
    getNamespaceDeclarationsCount() const
    {
        return m_namespaceDeclarations.size();
    }

private:

    /**
     * Create all of the result attribute names.
     *
     * @param theConstructionContext The current construction context.
     */
    void
    createResultAttributeNames(StylesheetConstructionContext&   theConstructionContext);

    /**
     * Process the exclude result prefix data.
     *
     * @param theConstructionContext The current construction context.
     * @param theElementPrefix The prefix of the owning element.
     * @param prefixChecker A pointer to a PrefixChecker instance to use, if any.
     */
    void
    processExcludeResultPrefixes(
            StylesheetConstructionContext&  theConstructionContext,
            const XalanDOMString&           theElementPrefix,
            const PrefixChecker*            prefixChecker);

    /**
     * Process the namespace aliases data.
     */
    void
    processNamespaceAliases();

    /**
     * Copy the contents of the supplied map
     *
     * @param theNamespaceAliases The map to copy.
     */
    void
    copyNamespaceAliases(const NamespaceAliasesMapType&     theNamespaceAliases);

    /**
     * Copy the contents of the supplied vector
     *
     * @param theExtensionNamespaceURIs The set to copy.
     */
    void
    copyExtensionNamespaceURIs(const XalanDOMStringPointerVectorType&   theExtensionNamespaceURIs);

    /**
     * Copy the contents of the supplied vector
     *
     * @param theExcludeResultPrefixes The vector to copy.
     */
    void
    copyExcludeResultPrefixes(const NamespacesVectorType&   theExcludeResultPrefixes);

    /**
     * Determine if a given namespace should be excluded as a result of
     * an exclude-result-prefixes declaration.
     *
     * @param theNamespaceURI The namespace URI to check.
     * @return true if the namespace should be excluded, false if not.
     */
    bool
    isExcludedNamespaceURI(const XalanDOMString&    theNamespaceURI) const;

    /**
     * Determine if a given URI is an extension namespace URI
     *
     * @param theNamespaceURI The namespace URI to check.
     * @return true if the namespace uri is an extension namespace URI, false if not.
     */
    bool
    isExtensionNamespaceURI(const XalanDOMString&   theNamespaceURI) const
    {
        return findString(theNamespaceURI, m_extensionNamespaceURIs);
    }

    /**
     * Determine if a given string is present in the vector
     *
     * @param theString The string to find.
     * @return true if the string is present, false if not.
     */
    static bool
    findString(
            const XalanDOMString&                   theString,
            const XalanDOMStringPointerVectorType&  theVector);


    // Not implemented...
    bool
    operator==(const NamespacesHandler&) const;


    // Data members...
    NamespacesVectorType                m_excludedResultPrefixes;

    NamespaceExtendedVectorType         m_namespaceDeclarations;

    XalanDOMStringPointerVectorType     m_extensionNamespaceURIs;

    NamespaceAliasesMapType             m_namespaceAliases;
};


}


#endif  // XALAN_NAMESPACESHANDLER_HEADER_GUARD