mirror of
https://github.com/RetroShare/RetroShare.git
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119 lines
3.0 KiB
C++
119 lines
3.0 KiB
C++
/*******************************************************************************
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* plugins/FeedReader/util/XPathWrapper.cpp *
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* *
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* Copyright (C) 2012 by Thunder <retroshare.project@gmail.com> *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU Affero General Public License as *
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* published by the Free Software Foundation, either version 3 of the *
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* License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU Affero General Public License for more details. *
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* *
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* You should have received a copy of the GNU Affero General Public License *
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* along with this program. If not, see <https://www.gnu.org/licenses/>. *
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* *
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*******************************************************************************/
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#include "XPathWrapper.h"
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#include "XMLWrapper.h"
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XPathWrapper::XPathWrapper(XMLWrapper &xmlWrapper) : mXMLWrapper(xmlWrapper)
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{
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mContext = NULL;
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mResult = NULL;
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}
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XPathWrapper::~XPathWrapper()
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{
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cleanup();
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}
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void XPathWrapper::cleanup()
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{
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if (mResult) {
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xmlXPathFreeObject(mResult);
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mResult = NULL;
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}
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if (mContext) {
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xmlXPathFreeContext(mContext);
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mContext = NULL;
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}
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}
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bool XPathWrapper::compile(const char *expression)
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{
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cleanup();
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xmlDocPtr document = mXMLWrapper.getDocument();
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if (!document) {
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return false;
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}
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mContext = xmlXPathNewContext(document);
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if (!mContext) {
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cleanup();
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return false;
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}
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xmlChar *xmlExpression = NULL;
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if (!mXMLWrapper.convertFromString(expression, xmlExpression)) {
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cleanup();
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return false;
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}
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mResult = xmlXPathEvalExpression(xmlExpression, mContext);
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xmlFree(xmlExpression);
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return true;
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}
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xmlXPathObjectType XPathWrapper::type()
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{
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if (mResult) {
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return mResult->type;
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}
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return XPATH_UNDEFINED;
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}
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unsigned int XPathWrapper::count()
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{
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if (!mResult) {
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return 0;
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}
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if (mResult->type != XPATH_NODESET) {
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return 0;
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}
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if (xmlXPathNodeSetIsEmpty(mResult->nodesetval)) {
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return 0;
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}
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return mResult->nodesetval->nodeNr;
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}
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xmlNodePtr XPathWrapper::node(unsigned int index)
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{
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if (!mResult) {
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return NULL;
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}
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if (mResult->type != XPATH_NODESET) {
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return NULL;
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}
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if (xmlXPathNodeSetIsEmpty(mResult->nodesetval)) {
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return NULL;
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}
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if (index >= (unsigned int) mResult->nodesetval->nodeNr) {
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return NULL;
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}
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return mResult->nodesetval->nodeTab[index];
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}
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