pathstepexpression.cpp

Go to the documentation of this file.

/*
 | 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.
 | ****************************************************************************
*/

#include "pathstepexpression.h"
#include "pathsteptagexpression.h"
#include "pathstepstarexpression.h"
#include "pathstepnodeexpression.h"
#include "pathsteptextexpression.h"

PathStepExpression::PathStepExpression(EXP_TYPE _type, AXIS_TYPE _axis,
                                       PathStepAttribute *
                                       _attribute):Expression(_type),
axis(_axis),
attribute(_attribute) {
}

PathStepExpression::~PathStepExpression() {
    delete attribute;
}

NODETEST_TYPE PathStepExpression::getNodeTestType() {
    switch (type) {
        case et_pathsteptag:
            return ntt_tag;
        case et_pathstepstar:
            return ntt_star;
        case et_pathstepnode:
            return ntt_node;
        case et_pathsteptext:
            return ntt_text;
        default:               // should never happen
            return ntt_tag;
    }
}

unsigned PathStepExpression::getStepWeight(bool is_last_step) {
    unsigned weight = 0;

    switch (axis) {
        case at_child:
            weight = WEIGHT_AXIS_CHILD;
            break;
        case at_descendant:
            weight = WEIGHT_AXIS_DESCENDANT;
            break;
        case at_dos:
            weight = WEIGHT_AXIS_DOS;
            break;
    }
    if (is_last_step) {
        switch (type) {
            case et_pathsteptag:
                weight = weight * WEIGHT_NODETEST_TAG;
                break;
            case et_pathstepstar:
                weight = weight * WEIGHT_NODETEST_STAR;
                break;
            case et_pathstepnode:
                weight = weight * WEIGHT_NODETEST_NODE;
                break;
            case et_pathsteptext:
                weight = weight * WEIGHT_NODETEST_TEXT;
                break;
            default:           // should never happen
                break;
        }
    } else {
        weight = weight * WEIGHT_INNER_NODETEST;
    }

    return weight;
}

bool PathStepExpression::isSyntacticallyEqualTo(PathStepExpression * ps) {
    if (ps) {
        if (axis != ps->getAxisType()) {
            return false;
        } else if (getNodeTestType() != ps->getNodeTestType()) {
            return false;
        } else if (ps->isTagNodeTest()) {
            return isMatchingTag(((PathStepTagExpression *) ps)->getNodeTest());
        }
        return true;
    }
    return false;
}

---