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// -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// Author: Jose M. Vidal
// $Id: channel.C,v 1.8 2001/08/25 21:26:30 jmvidal Exp $
// This code is copyright of Jose M. Vidal and released under
// the GNU General Public License
#include "channel.H"
//defined in reference.C
extern string trim(const string & s);
bool channel::readChannel() {
if (read && title == "")
return false; //we failed before, dont try again
else if (read)
return true; //already read it OK.
read = true; //we will try to read it.
cout << "Reading channel " << name << endl;
iwebstream ifs(url);
if (ifs == 0) { //could not read url, try backup file
cerr << "Could not read channel=" << name << ", trying backup file" << endl;
iwebstream ifs2(backupFile); //backup file could also be a url!
if (ifs2 == 0) {
cerr << "Could not read backup file=" << backupFile << endl;
return false;
}
reference r;
readStream(ifs2);
while (r.readXml(ifs2)){
items.push_back(r);
r.comment = "";
r.title = "";
r.url = "";
}
}
else { //read url OK.
reference r;
if (readStream(ifs)){ //parsed <channel> section OK
while (r.readXml(ifs))
items.push_back(r);
r.comment = "";
r.title = "";
r.url = "";
}
else { //could not parse <channel> section
cerr << "Could not parse channel=" << name << ", trying backup file" << endl;
iwebstream ifs2(backupFile); //backup file could also be a url!
if (ifs2 == 0) {
cerr << "Could not read backup file=" << backupFile << endl;
return false;
}
reference r;
readStream(ifs2);
while (r.readXml(ifs2)){
items.push_back(r);
r.comment = "";
r.title = "";
r.url = "";
}
}
}
return true;
}
//not used, dont know if it works.
void channel::readImage() {
if (imageLink != "") {
iwebstream image(imageLink);
if (image != 0){
string filename = backupFile + "-image";
ofstream of(filename.c_str());
for (char c = image.get(); !image.eof(); c =image.get()) {
of << c;
}
of.close();
}
}
}
/**
Parse an RSS channel.
This should go away soon and be replaced with XMLParser.
*/
bool channel::readStream(iwebstream & is) {
const string channelT = "<channel";
const string titleT = "<title>";
const string titleET = "</title>";
const string linkT = "<link>";
const string linkET = "</link>";
const string descriptionT = "<description>";
const string descriptionET = "</description>";
const string languageT = "<language>";
const string languageET = "</language>";
const string imageT = "<image>";
const string imageET = "</image>";
const string urlT = "<url>";
const string urlET = "</url>";
if (!is.find(channelT)) {
cerr << "Channel file does not have " << channelT << " section" << endl;
cerr << "The channel we downloaded is:" << endl;
cerr << is.getData() << endl;
return false;
}
title = is.findTag(titleT, titleET, channelT);
title = trim(title);
siteUrl = is.findTag(linkT, linkET, channelT);
description = is.findTag(descriptionT, descriptionET, channelT);
description = trim(description);
language = is.findTag(languageT, languageET, channelT);
//if there is an image, read it
imageTitle = is.findTag(titleT, titleET, imageT);
imageUrl = is.findTag(urlT, urlET, imageT);
imageLink = is.findTag(linkT, linkET, imageT);
ofstream of(backupFile.c_str());
if (of == 0) {
cerr << "Could not write channel to " << backupFile << endl;
return true;
}
of << is.getData();
of.close();
return true;
}
void channel::increaseHits(const string & url, int x){
for (vector<reference>::iterator i = items.begin(); i!= items.end(); ++i){
if ((*i).url == url)
(*i).hits+= x;
};
}
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