xmlserializer/XmlDocSource.h

/*
 * Copyright (c) 2011-2014, Intel Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once
#include "XmlElement.h"
#include "XmlSerializingContext.h"
#include <string>

struct _xmlDoc;
struct _xmlNode;
struct _xmlError;

/**
  * The CXmlDocSource is used by CXmlDocSink.
  * The interaction between the xml source and xml sink is defined
  * in the process method of CXmlDocSink. One can subclass CXmlDocSource
  * for different purposes by implementing the populate method and then
  * use it with any existing implementation of CXmlDocSink.
  */
class CXmlDocSource
{
public:
    /**
      * Constructor
      *
      * @param[out] pDoc a pointer to the xml document that will be filled by the class
      * @param[in] pRootNode a pointer to the root element of the document.
      * @param[in] bValidateWithSchema a boolean that toggles schema validation
      */
    CXmlDocSource(_xmlDoc* pDoc, bool bValidateWithSchema = false, _xmlNode* pRootNode = NULL);

    /**
      * Constructor
      *
      * @param[out] pDoc a pointer to the xml document that will be filled by the class
      * @param[in] strXmlSchemaFile a string containing the path to the schema file
      * @param[in] strRootElementType a string containing the root element type
      * @param[in] strRootElementName a string containing the root element name
      * @param[in] strNameAttributeName a string containing the name of the root name attribute
      * @param[in] bValidateWithSchema a boolean that toggles schema validation
      */
    CXmlDocSource(_xmlDoc* pDoc, bool bValidateWithSchema,
                           const std::string& strXmlSchemaFile = "",
                           const std::string& strRootElementType = "",
                           const std::string& strRootElementName = "",
                           const std::string& strNameAttributeName = "");

    /**
      * Destructor
      */
    virtual ~CXmlDocSource();

    /**
      * Method called by the CXmlDocSink::process method.
      *
      * @param[out] serializingContext is used as error output
      *
      * @return false if there are any error
      */
    virtual bool populate(CXmlSerializingContext& serializingContext);

    /**
      * Method that returns the root element of the Xml tree.
      *
      * @param[out] xmlRootElement a reference to the CXmleElement destination
      */
    void getRootElement(CXmlElement& xmlRootElement) const;

    /**
      * Getter method.
      *
      * @return the root element's name
      */
    std::string getRootElementName() const;

    /**
      * Getter method.
      * Method that returns the root element's attribute with name matching strAttributeName.
      *
      * @param[in] strAttributeName is a std::string used to find the corresponding attribute
      *
      * @return the value of the root's attribute named as strAttributeName
      */
    std::string getRootElementAttributeString(const std::string& strAttributeName) const;

    /**
      * Getter method.
      * Method that returns the xmlDoc contained in the Source.
      * (Can be used in a Doc Sink)
      *
      * @return the document _pDoc
      */
    _xmlDoc* getDoc() const;

    /**
      * Method that validates the Xml doc contained in pDoc
      *
      * @param[out] serializingContext is used as error output
      *
      * @return false if any error occurs
      */
    virtual bool validate(CXmlSerializingContext& serializingContext);

    /**
    * Method that checks that the xml document has been correctly parsed.
    *
    * @return false if any error occurs during the parsing
    */
    virtual bool isParsable() const;

    /**
     * Helper method for creating an xml document from either a file or a
     * string.
     *
     * @param[in] source either a filename or a string representing an xml document
     * @param[in] fromFile true if source is a filename, false if source is an xml
     *            represents an xml document
     * @param[in] xincludes if true, process xincludes tags
     * @param[out] errorMsg used as error output
     */
    static _xmlDoc* mkXmlDoc(const std::string& source, bool fromFile, bool xincludes, std::string& errorMsg);

protected:

    /**
      * Doc
      */
    _xmlDoc* _pDoc;

    /**
      * Root node
      */
    _xmlNode* _pRootNode;

    /**
      * libxml2 library cleanup
      */
    static bool _bLibXml2CleanupScheduled;

private:

    /**
      * Method that initializes class internal attributes in constructor
      */
    void init();

    /** Method that check the validity of the document with the xsd file.
      *
      * @return true if document is valid, false if any error occures
      */
    bool isInstanceDocumentValid();

    /** Validity error display method
      *
      * @param[in] pUserData pointer to the data to validate
      * @param[out] pError is the xml error output
      */
    static void schemaValidityStructuredErrorFunc(void* pUserData, _xmlError* pError);

    /**
      * Schema file
      */
    std::string _strXmlSchemaFile;

    /**
      * Element type info
      */
    std::string _strRootElementType;

    /**
      * Element name info
      */
    std::string _strRootElementName;

    /**
      * Element name attribute info
      */
    std::string _strNameAttributeName;

    /**
      * Boolean that enables the validation via xsd files
      */
    bool _bValidateWithSchema;
};