/*

 * 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.

 */

/*

 * $Id: MemBufFormatTarget.hpp 568078 2007-08-21 11:43:25Z amassari $

 */

#ifndef MemBufFormatTarget_HEADER_GUARD_

#define MemBufFormatTarget_HEADER_GUARD_

#include <xercesc/framework/XMLFormatter.hpp>

XERCES_CPP_NAMESPACE_BEGIN

/*

 * The MemBufFormatTarget is a derivative from XMLFormatTarget, which user code

 * may plug into DOMWriter to retrieve the serialized XML stream (from DOM Tree)

 * in a memory buffer.

 *

 * The MemBufFormatTarget is initalized to have a memory buffer of 1023 upon

 * construction, which grows as needed. The buffer will be deleted when

 * MemBufFormatTarget is destructed; or will be reset when the reset() function

 * is called.

 *

 * The MemBufFormatTarget returns a NULL terminated XMLByte stream upon request,

 * through the method getRawBuffer(), and user should make its own copy of the

 * returned buffer if it intends to keep it independent on the state of the

 * MemBufFormatTarget.

 */

class XMLPARSER_EXPORT MemBufFormatTarget : public XMLFormatTarget {

public:

    /** @name constructors and destructor */

    //@{

    MemBufFormatTarget

    (

          int                  initCapacity = 1023

        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager

    ) ;

    ~MemBufFormatTarget();

    //@}

    // -----------------------------------------------------------------------

    //  Implementations of the format target interface

    // -----------------------------------------------------------------------

    virtual void writeChars(const XMLByte* const toWrite

                          , const unsigned int   count

                          , XMLFormatter* const  formatter);

    // -----------------------------------------------------------------------

    //  Getter

    // -----------------------------------------------------------------------

    /** @name getRawBuffer */

    //@{

    /**

     * Returned the internal raw buffer.

     *

     */

    //@}

    const XMLByte* getRawBuffer() const;

    /** @name getLen */

    //@{

    /**

     * Returned the length of the raw buffer.

     *

     */

    //@}

    unsigned int getLen() const

    {

        return fIndex;

    }

    /** @name reset */

    //@{

    /**

     * Reset the internal string buffer.

     *

     */

    void reset();

    //@}

private:

    // -----------------------------------------------------------------------

    //  Unimplemented methods.

    // -----------------------------------------------------------------------

    MemBufFormatTarget(const MemBufFormatTarget&);

    MemBufFormatTarget& operator=(const MemBufFormatTarget&);

    // -----------------------------------------------------------------------

    //  Private helpers

    // -----------------------------------------------------------------------

    void insureCapacity(const unsigned int extraNeeded);

    // -----------------------------------------------------------------------

    //  Private data members

    //

    //  fDataBuf

    //      The pointer to the buffer data. Its grown as needed. Its always

    //      one larger than fCapacity, to leave room for the null terminator.

    //

    //  fIndex

    //      The current index into the buffer, as characters are appended

    //      to it. If its zero, then the buffer is empty.

    //

    //  fCapacity

    //      The current capacity of the buffer. Its actually always one

    //      larger, to leave room for the null terminator.

    //

    // -----------------------------------------------------------------------

    MemoryManager*  fMemoryManager;

    XMLByte*        fDataBuf;

    unsigned int    fIndex;

    unsigned int    fCapacity;

};

XERCES_CPP_NAMESPACE_END

#endif