source: NonGTP/Xerces/xerces/samples/DOMPrint/DOMPrintFilter.cpp @ 358

/*
 * Copyright 2002,2004 The Apache Software Foundation.
 * 
 * Licensed 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: DOMPrintFilter.cpp,v 1.4 2004/09/08 13:55:31 peiyongz Exp $
 * $Log: DOMPrintFilter.cpp,v $
 * Revision 1.4  2004/09/08 13:55:31  peiyongz
 * Apache License Version 2.0
 *
 * Revision 1.3  2002/06/04 14:22:51  peiyongz
 * Implement setter/getter from DOMWriterFilter
 *
 * Revision 1.2  2002/06/03 22:40:07  peiyongz
 * *** empty log message ***
 *
 * Revision 1.1  2002/05/29 13:33:32  peiyongz
 * DOM3 Save Interface: DOMWriter/DOMWriterFilter
 *
 */

#include "DOMPrintFilter.hpp"
#include <xercesc/util/XMLUniDefs.hpp>
#include <xercesc/util/XMLString.hpp>

static const XMLCh  element_person[]=
{
        chLatin_p, chLatin_e, chLatin_r, chLatin_s, chLatin_o, chLatin_n, chNull 
};

static const XMLCh  element_link[]=
{
        chLatin_l, chLatin_i, chLatin_n, chLatin_k, chNull 
};

DOMPrintFilter::DOMPrintFilter(unsigned long whatToShow)
:fWhatToShow(whatToShow)
{}

short DOMPrintFilter::acceptNode(const DOMNode* node) const
{
        //
        // The DOMWriter shall call getWhatToShow() before calling 
        // acceptNode(), to show nodes which are supposed to be 
        // shown to this filter.
        // 
        // REVISIT: In case the DOMWriter does not follow the protocol, 
        //          Shall the filter honour, or NOT, what it claimes
        //         (when it is constructed/setWhatToShow()) 
        //          it is interested in ?
        // 
        // The DOMLS specs does not specify that acceptNode() shall do
        // this way, or not, so it is up the implementation,
        // to skip the code below for the sake of performance ...
        //
        if ((getWhatToShow() & (1 << (node->getNodeType() - 1))) == 0)
                return DOMNodeFilter::FILTER_ACCEPT;

        switch (node->getNodeType())
        {
        case DOMNode::ELEMENT_NODE:
                {
                        // for element whose name is "person", skip it
                        if (XMLString::compareString(node->getNodeName(), element_person)==0)
                                return DOMNodeFilter::FILTER_SKIP;
                        // for element whose name is "line", reject it
                        if (XMLString::compareString(node->getNodeName(), element_link)==0)
                                return DOMNodeFilter::FILTER_REJECT;
                        // for rest, accept it
                        return DOMNodeFilter::FILTER_ACCEPT;

                        break;
                }
        case DOMNode::COMMENT_NODE:
                {
                        // the WhatToShow will make this no effect
                        return DOMNodeFilter::FILTER_REJECT;
                        break;
                }
        case DOMNode::TEXT_NODE:
                {
                        // the WhatToShow will make this no effect
                        return DOMNodeFilter::FILTER_REJECT;
                        break;
                }
        case DOMNode::DOCUMENT_TYPE_NODE:
                {
                        // even we say we are going to process document type,
                        // we are not able be to see this node since
                        // DOMWriterImpl (a XercesC's default implementation
                        // of DOMWriter) will not pass DocumentType node to
                        // this filter.
                        //
                        return DOMNodeFilter::FILTER_REJECT;  // no effect
                        break;
                }
        case DOMNode::DOCUMENT_NODE:
                {
                        // same as DOCUMENT_NODE
                        return DOMNodeFilter::FILTER_REJECT;  // no effect
                        break;
                }
        default :
                {
                        return DOMNodeFilter::FILTER_ACCEPT;
                        break;
                }
        }

        return DOMNodeFilter::FILTER_ACCEPT;
}