src/xalanc/XalanSourceTree/XalanSourceTreeContentHandler.hpp

/*
 * 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(XALANSOURCETREECONTENTHANDLER_HEADER_GUARD_1357924680)
#define XALANSOURCETREECONTENTHANDLER_HEADER_GUARD_1357924680



#include <xalanc/XalanSourceTree/XalanSourceTreeDefinitions.hpp>



#include <xalanc/Include/XalanVector.hpp>



#include <xercesc/sax/DocumentHandler.hpp>
#include <xercesc/sax/DTDHandler.hpp>
#include <xercesc/sax2/ContentHandler.hpp>
#include <xercesc/sax2/LexicalHandler.hpp>



#include <xalanc/XalanDOM/XalanDOMString.hpp>



namespace XERCES_CPP_NAMESPACE { class Attributes; }
namespace XERCES_CPP_NAMESPACE { class AttributeList; }
namespace XERCES_CPP_NAMESPACE { class ContentHandler; }
namespace XERCES_CPP_NAMESPACE { class DTDHandler; }
namespace XERCES_CPP_NAMESPACE { class LexicalHandler; }
namespace XERCES_CPP_NAMESPACE { class Locator; }



XALAN_CPP_NAMESPACE_BEGIN



using xercesc::Locator;



typedef xercesc::Attributes       AttributesType;
typedef xercesc::AttributeList    AttributeListType;
typedef xercesc::ContentHandler   ContentHandlerType;
typedef xercesc::DTDHandler       DTDHandlerType;
typedef xercesc::LexicalHandler   LexicalHandlerType;
typedef xercesc::Locator          LocatorType;



class XalanNode;
class XalanSourceTreeDocument;
class XalanSourceTreeElement;



class XALAN_XALANSOURCETREE_EXPORT XalanSourceTreeContentHandler :
    public ContentHandlerType,
    public DTDHandlerType,
    public LexicalHandlerType
{
public:

    typedef XalanVector<XalanSourceTreeElement*>        ElementStackType;
    typedef XalanVector<XalanNode*>                     LastChildStackType;
    typedef XalanSize_t                                 size_type;

    enum { eDefaultStackSize = 50, eDefaultTextBufferSize = 100 };


    // Constructor
    explicit
    XalanSourceTreeContentHandler(
            MemoryManager&          theManager,
            XalanSourceTreeDocument*    theDocument = 0,
            bool                        fAccumulateText = true);

    virtual
    ~XalanSourceTreeContentHandler();


    // Inherited from ContentHandler...
    virtual void
    characters(
            const XMLCh* const  chars,
            const size_type     length);

    virtual void
    endDocument();

    virtual void
    endElement(
            const XMLCh* const  uri, 
            const XMLCh* const  localname, 
            const XMLCh* const  qname);

    virtual void
    ignorableWhitespace(
            const XMLCh* const  chars,
            const size_type     length);

    virtual void
    processingInstruction(
        const XMLCh* const  target,
        const XMLCh* const  data);

    virtual void
    setDocumentLocator(const Locator* const     locator);

    virtual void
    startDocument();

    virtual void
    startElement(
            const XMLCh* const      uri,
            const XMLCh* const      localname,
            const XMLCh* const      qname,
            const AttributesType&   attrs);

    virtual void
    startPrefixMapping(
        const XMLCh* const  prefix,
        const XMLCh* const  uri);

    virtual void
    endPrefixMapping(const XMLCh* const     prefix);


    virtual void
    skippedEntity(const XMLCh* const    name);


    // Inherited from DTDHandler...

    virtual void
    notationDecl(
            const XMLCh* const    name,
            const XMLCh* const    publicId,
            const XMLCh* const    systemId);

    virtual void
    unparsedEntityDecl(
            const XMLCh* const    name,
            const XMLCh* const    publicId,
            const XMLCh* const    systemId,
            const XMLCh* const    notationName);

    virtual void
    resetDocType();


    // Inherited from LexicalHandler...

    virtual void
    comment(
            const XMLCh* const  chars,
            const size_type     length);

    virtual void
    endCDATA();

    virtual void
    endDTD();

    virtual void
    endEntity(const XMLCh* const    name);

    virtual void
    startCDATA();

    virtual void
    startDTD(
            const XMLCh* const  name,
            const XMLCh* const  publicId,
            const XMLCh* const  systemId);

    virtual void
    startEntity(const XMLCh* const  name);

    
    // New to XalanSourceTreeContentHandler...

    XalanSourceTreeDocument*
    getDocument() const
    {
        return m_document;
    }

    void
    setDocument(XalanSourceTreeDocument*    theDocument);

private:

    // Not implemented...
    XalanSourceTreeContentHandler(const XalanSourceTreeContentHandler&);

    XalanSourceTreeContentHandler&
    operator=(const XalanSourceTreeContentHandler&);

    bool
    operator==(const XalanSourceTreeContentHandler&) const;

    // Helper functions...
    XalanSourceTreeElement*
    createElement(
            const XMLCh* const          uri,
            const XMLCh* const          localname,
            const XMLCh* const          qname,
            const AttributesType&       attrs,
            XalanSourceTreeElement*     theOwnerElement);

    void
    processAccumulatedText();

    void
    doCharacters(
            const XMLCh*    chars,
            size_type       length);

    // Data members...

    // The current document we're building...
    XalanSourceTreeDocument*    m_document;

    // The current element...
    XalanSourceTreeElement*     m_currentElement;

    // Stack of elements...
    ElementStackType            m_elementStack;

    // The last child appended to the current element.  This is
    // an important optimization, because XalanSourceTreeElement
    // does not have a pointer to its last child.  Without this,
    // appending a child becomes a linear search.
    XalanNode*                  m_lastChild;

    // Stack of last children appended.  There is a ono-to-one
    // correspondance to the entries in m_elementStack.
    LastChildStackType          m_lastChildStack;

    // If true, the handler will accumulate text from calls to
    // characters() until another event triggers the creation
    // of the node.
    const bool                  m_accumulateText;

    // A buffer to hold accumulated text.
    XalanDOMString              m_textBuffer;

    // A flag to determine if the DTD is being processed.
    bool                        m_inDTD;
};



XALAN_CPP_NAMESPACE_END



#endif  // #if !defined(XALANSOURCETREECONTENTHANDLER_HEADER_GUARD_1357924680)