bufferiterator.h

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/*
 | Author: Michael Schmidt;
 |         Gunnar Jehl 
 |
 | ************************* SOFTWARE LICENSE AGREEMENT ***********************
 | This source code is published under the BSD License.
 |
 | See file 'LICENSE.txt' that comes with this distribution or
 | http://dbis.informatik.uni-freiburg.de/index.php?project=GCX/license.php
 | for the full license agreement.
 |
 | 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 OWNER 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; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 | POSSIBILITY OF SUCH DAMAGE.
 | ****************************************************************************
*/

#ifndef BUFFERITERATOR_H
#define BUFFERITERATOR_H

#include <vector>
#include <stack>
#include "buffernode.h"
#include "streampreprocessor.h"
#include "tagnode.h"
#include "pathstepattributeposition.h"
#include "runtimeexception.h"

#define READ_UP_TO_CLOSE_BASE       0

#define READ_UP_TO_CLOSE_CONTEXT    1

#define READ_UP_TO_CLOSE_NONE       2

#define LOCK_CONTEXT_NO_CLEAR       10

#define LOCK_CONTEXT_LAST_CLEAR     11

#define LOCK_CONTEXT_ALWAYS_CLEAR   12

#define LOCK_NONE_NO_CLEAR          13

#define BIT_DEBUG_MODE_FULL     0

#define BIT_DEBUG_MODE_PARTIAL  1

#define BIT_DEBUG_MODE_SIMPLE   2

class BufferIterator {

  public:
    BufferIterator(BufferNode * _base, PathExpression * _path);

    virtual ~ BufferIterator();

    void init(BufferNode * _base);

    void debugPrint(OutputStream & dos, unsigned debug_mode =
                    BIT_DEBUG_MODE_SIMPLE);

    BufferNode *getNext(unsigned read_up_to_closing = READ_UP_TO_CLOSE_NONE,
                        unsigned lock_node = LOCK_NONE_NO_CLEAR);

    void reset();

    void clear();

  private:
     BufferNode * isSatisfyingPath(BufferNode * nnode);

    bool isMatchingNodeTestAndPredicates(BufferNode * nnode, unsigned ps_idx);

    BufferNode *getPrevPSNode();

    void unsignPSNode(BufferNode * nnode);

    BufferNode *base;

    BufferNode *cur;

    BufferNode *cur_old;

    bool cur_locked;

    PathExpression *path;

    StreamPreProcessor *spp;

     vector < BufferNode * >ps_context;

     vector < unsigned >ps_context_position;

     vector < bool > ps_skip_subtree;

     vector < bool > ps_attribute;

     vector < unsigned >ps_attribute_position;

     vector < bool > ps_back_track;

    unsigned ps_index;
};

#endif // BUFFERITERATOR_H

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