/// <summary>
/// Constructor
/// </summary>
/// <param name="title">Title of page</param>
/// <param name="ns">Namespace of this page</param>
/// <param name="ID">ID for this page</param>
/// <param name="lines">Lines contained in this page</param>
/// <param name="sectionLayout">Layout of sections (see section class for documentation)</param>
public Page(string title, WikiDB.Namespace ns, int ID, List <string> lines, string sectionLayout)
: this(title, ns, ID)
{
_lines = lines;
_sections = Section.ExtractSections(lines, null, this, sectionLayout);
_sectionsRecovered = true;
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="title">Title of page</param>
/// <param name="ns">Namespace of this page</param>
/// <param name="ID">ID for this page</param>
public Page(string title, WikiDB.Namespace ns, int ID)
: this()
{
_title = title;
_namespace = ns;
_ID = ID;
}
/// <summary>
/// Get titles containing a word
/// </summary>
/// <param name="ns">Namespace to search</param>
/// <param name="s">Word to look for</param>
/// <returns>List of page titles (strings) containing word</returns>
public override List <string> GetTitlesContaining(WikiDB.Namespace ns, string s)
{
if (!Connected)
{
throw new Exception("Not connected to mirror DB");
}
s = MySQLEscape(s);
List <string> titles = new List <string>();
if (s == "")
{
return(titles);
}
int nsVal = NamespaceValue(ns);
IDataReader reader = SubmitQuery("SELECT page_title FROM titleindex " +
"WHERE word=\"" + s + "\" AND page_namespace=" + nsVal);
while (reader.Read())
{
titles.Add(reader["page_title"].ToString());
}
reader.Close();
return(titles);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="rawLink">Raw text for link</param>
/// <param name="pageTitle">Title of page being linked to</param>
/// <param name="pageSection">Section of page being linked to</param>
/// <param name="displayText">Display text for link</param>
/// <param name="sourceSection">Section of source page that contains this link</param>
public WikiLink(string rawLink, string pageTitle, string pageSection, string displayText, Section sourceSection)
{
_rawLink = rawLink;
_destPageTitle = pageTitle;
_destPageSection = pageSection;
_displayText = displayText != "" ? displayText : (pageTitle + (_destPageSection != "" ? "#" + _destPageSection : ""));
_displayText = WikiMarkup.ProcessMarkup(_displayText);
_destPageNamespace = WikiDB.Namespace.Main;
_sourcePage = sourceSection.ContainingPage;
_sourceSection = sourceSection;
_weight = 0;
}
/// <summary>
/// Write page index table
/// </summary>
/// <param name="startID">Where to start writing</param>
/// <param name="numPages">Total number of pages to write</param>
/// <param name="blockSize">Number of pages to read at a time</param>
/// <param name="ns">Namespace to read/write from/to</param>
/// <param name="includeRedirects">Whether or not to include redirect pages</param>
/// <returns>Last title written</returns>
public string WritePageIndex(int startID, int numPages, int blockSize, WikiDB.Namespace ns, bool includeRedirects)
{
if (_mainDB == null)
{
throw new Exception("Main DB not connected. Use the right constructor.");
}
if (!_mainDB.CheckConnection(true))
{
throw new Exception("Not connected to main DB");
}
if (!CheckConnection(true))
{
throw new Exception("Not connected to mirror DB");
}
_stopWriting = false;
int end = startID + numPages - 1;
int i;
// check block size
if (blockSize > numPages)
{
blockSize = numPages;
}
for (i = startID; i <= end; i += blockSize)
{
if (_stopWriting)
{
break;
}
// get titles
List <string> titles = null;
try
{
titles = _mainDB.GetTitleRange(ns, i, blockSize, includeRedirects);
WritePageIndex(ns, titles);
}
catch (Exception ex)
{
throw new Exception("Failed at start ID " + i + ". Error: " + ex);
}
}
return(_lastTitleWritten);
}
/// <summary>
/// Gets whether or not a page is a redirect page
/// </summary>
/// <param name="ns">Namespace to search</param>
/// <param name="title">Title to search</param>
/// <returns>True if page is a redirect page, False otherwise</returns>
public override bool IsRedirect(WikiDB.Namespace ns, string title)
{
title = MySQLEscape(GetURLFromPageTitle(title));
if (title == "")
{
return(false);
}
int nsVal = NamespaceValue(ns);
IDataReader reader = SubmitQuery("SELECT redirects_to FROM page " +
"WHERE page_namespace=" + nsVal + " AND page_title=\"" + title + "\"");
if (reader.Read())
{
string redirectsTo = reader["redirects_to"].ToString();
reader.Close();
return(redirectsTo != "");
}
else
{
reader.Close();
return(false);
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="title">Title of page</param>
/// <param name="ns">Namespace of this page</param>
/// <param name="ID">ID for this page</param>
/// <param name="wikiText">Wiki text for page</param>
/// <param name="database">Database containing this page</param>
/// <param name="followRedirection">Whether or not to follow redirection</param>
public Page(string title, WikiDB.Namespace ns, int ID, string wikiText, WikiDB database, bool followRedirection)
: this(title, ns, ID)
{
// remove irrelevant markup
wikiText = WikiMarkup.RemoveIrrelevantMarkup(wikiText);
// split page up into lines
_lines = Section.GetLines(wikiText);
int firstSectionStart = Section.GetNextSectionStart(_lines, 0);
List <string> headerLines = Section.ExtractLines(_lines, 0, firstSectionStart - 1);
if (headerLines.Count > 0)
{
Header h = new Header(headerLines, this);
_sections.Add(h);
}
// get sections
_sections.AddRange(Section.ExtractSections(_lines, null, this));
// check for redirect page
string firstLine = "";
if (_lines.Count > 0)
{
firstLine = _lines[0];
}
string redirect = "#redirect";
if (firstLine.Length >= redirect.Length &&
firstLine.Substring(0, redirect.Length).ToLower() == redirect &&
WikiLinks.Count == 1 &&
followRedirection)
{
// get redirect page
string redirectURL = WikiLinks[0].DestPageURL;
_redirectsTo = database.LookupPage(ns, redirectURL, followRedirection);
}
// process markup
WikiMarkup.ProcessMarkup(_lines);
// set line information for the page
SetLineInfo();
// get TF information
foreach (Section s in _sections)
{
foreach (string line in s.Lines)
{
string[] tokens = line.Split(' ');
foreach (string token in tokens)
{
// ignore case
string lowerToken = token.ToLower().Trim();
lowerToken = WikiMarkup.TrimPunctuation(lowerToken);
if (lowerToken == "" ||
WikiMarkup.IsStopWord(lowerToken, false))
{
continue;
}
if (!_termFrequencies.ContainsKey(lowerToken))
{
_termFrequencies[lowerToken] = 1.0F;
}
else
{
_termFrequencies[lowerToken] = _termFrequencies[lowerToken] + 1;
}
}
}
}
}
/// <summary>
/// Dumps a range of pages to a file
/// </summary>
/// <param name="startID">Where to start dumping</param>
/// <param name="numPages">Total number of pages to dump</param>
/// <param name="blockSize">Number of pages to read at a time</param>
/// <param name="ns">Namespace to read/write from/to</param>
/// <param name="dumpDir">Directory to save dump files in</param>
/// <param name="includeRedirects">Whether or not to dump redirect pages</param>
/// <returns>Last title dumped</returns>
public string DumpToLemur(int startID, int numPages, int blockSize, WikiDB.Namespace ns, string dumpDir, bool includeRedirects)
{
if (_mainDB == null)
{
throw new Exception("Main DB not connected. Use the right constructor.");
}
if (!_mainDB.Connected)
{
throw new Exception("Not connected to main DB");
}
if (!Connected)
{
throw new Exception("Not connected to mirror DB");
}
if (dumpDir[dumpDir.Length - 1] != '\\')
{
dumpDir += @"\";
}
_stopWriting = false;
string dumpFile = dumpDir + "dump_" + DateTime.Now.Ticks + ".xml";
StreamWriter dumpWriter = new StreamWriter(dumpFile);
dumpWriter.AutoFlush = true;
// bytes in a MB
int mb = 1024 * 1024;
// file size limit in MB
float mbLimit = 200;
int end = startID + numPages - 1;
int i;
for (i = startID; i <= end; i += blockSize)
{
if (_stopWriting)
{
break;
}
// check file size, start another one if needed
FileInfo fi = new FileInfo(dumpFile);
float sizeMB = fi.Length / (float)mb;
if (sizeMB > mbLimit)
{
dumpWriter.Close();
dumpFile = dumpDir + "dump_" + DateTime.Now.Ticks + ".xml";
dumpWriter = new StreamWriter(dumpFile);
}
// get titles
List <string> titles = null;
try
{
titles = GetTitleRange(ns, i, blockSize, includeRedirects);
}
catch (Exception ex)
{
dumpWriter.Close();
throw new Exception("Failed at start ID " + i + ". Error: " + ex);
}
// process titles
foreach (string title in titles)
{
if (_stopWriting)
{
break;
}
try
{
// get page from mirror and dump to file
Page p = LookupPage(ns, title, false, false, false, false);
if (p == null)
{
StreamWriter logWriter = new StreamWriter("lemur_dump_log.txt", true);
logWriter.WriteLine("Dump to Lemur: could not find page to write: " + title);
logWriter.Close();
}
else
{
dumpWriter.WriteLine(p.LemurDump);
}
_lastTitleWritten = p.Title;
_lastIDWritten = p.ID;
}
catch (Exception ex)
{
dumpWriter.Close();
throw new Exception("Failed at start ID " + i + ", title \"" + title + "\". Error: " + ex);
}
}
}
dumpWriter.Close();
return(_lastTitleWritten);
}
/// <summary>
/// Looks up page in database
/// </summary>
/// <param name="ns">Namespace to look page up in</param>
/// <param name="title">Title of page to look up</param>
/// <param name="followRedirection">Whether or not to look up destination of redirect pages</param>
/// <param name="recoverSections">Whether or not to recover the section structure of the page</param>
/// <param name="readLinks">Read link information</param>
/// <param name="readTFTable">Read term frequency table</param>
/// <returns>Page instance</returns>
public Page LookupPage(WikiDB.Namespace ns, string title, bool followRedirection,
bool recoverSections, bool readLinks, bool readTFTable)
{
string url = GetURLFromPageTitle(title);
// check page cache
if (_pageCache.ContainsKey(url))
{
// see if page is dirty
Page cached = (Page)_pageCache[url];
bool dirty = (recoverSections && !cached.SectionsRecovered) ||
(readLinks && cached.WikiLinks.Count == 0) ||
(readTFTable && cached.TermFrequencies.Count == 0);
if (!dirty)
{
return(cached);
}
else
{
_pageCache.Remove(url);
}
}
if (!CheckConnection(true))
{
throw new Exception("Could not establish connection with Wikipedia database");
}
Page p = null;
url = MySQLEscape(url);
int nsVal = NamespaceValue(ns);
// get text and redirect page
string selectCols = "page_id, page_text, redirects_to";
if (recoverSections)
{
selectCols += ", section_layout";
}
string query = "SELECT " + selectCols + " FROM page " +
"WHERE page_namespace=" + nsVal + " AND page_title=\"" + url + "\"";
IDataReader reader = SubmitQuery(query);
if (reader.Read())
{
int id = int.Parse(reader["page_id"].ToString());
string text = Encoding.UTF8.GetString((byte[])reader["page_text"]);
string redirectsTo = reader["redirects_to"].ToString();
// split into lines
List <string> lines = new List <string>(text.Split(new char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries));
if (recoverSections)
{
string sectionLayout = reader["section_layout"].ToString();
p = new Page(title, ns, id, lines, sectionLayout);
}
else
{
p = new Page(title, ns, id);
p.Lines = lines;
// add a single section to the page
Section s = new Section("full page section", lines, null, p, 0, lines.Count - 1);
p.Sections.Add(s);
}
reader.Close();
// check for page redirection
Page redirectPage = null;
if (redirectsTo != "" && followRedirection)
{
redirectPage = LookupPage(ns, redirectsTo, followRedirection, recoverSections, readLinks, readTFTable);
}
p.RedirectsTo = redirectPage;
}
else
{
reader.Close();
return(null);
}
reader.Close();
// get links
if (readLinks)
{
query = "SELECT link_list FROM pagelinks " +
"WHERE page_namespace=" + nsVal + " AND page_title=\"" + url + "\"";
reader = SubmitQuery(query);
if (reader.Read())
{
string linkList = Encoding.UTF8.GetString((byte[])reader["link_list"]);
string[] splitList = linkList.Split(new char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries);
foreach (string link in splitList)
{
string[] entry = link.Split(' ');
if (entry.Length != 2)
{
throw new Exception("Invalid link entry");
}
string destPage = entry[0];
string sourceSectionID = recoverSections ? entry[1] : "1";
Section s = p.GetSection(sourceSectionID);
WikiLink wl = new WikiLink("[[" + destPage + "]]", destPage, "", destPage, s);
s.AddLink(wl);
}
}
reader.Close();
}
// get TFs
if (readTFTable)
{
query = "SELECT freq_list FROM termfreqs WHERE page_namespace=" + nsVal + " AND page_title=\"" + url + "\"";
reader = SubmitQuery(query);
if (reader.Read())
{
string freqList = Encoding.UTF8.GetString((byte[])reader["freq_list"]);
string[] splitList = freqList.Split(new char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries);
// get freqs
for (int i = 0; i < splitList.Length; ++i)
{
string[] entry = splitList[i].Split(' ');
if (entry.Length != 2)
{
throw new Exception("Invalid frequency entry");
}
string word = entry[0];
float freq = float.Parse(entry[1]);
if (p.TermFrequencies.ContainsKey(word))
{
throw new Exception("Duplicate TF entry");
}
p.TermFrequencies[word] = freq;
}
}
reader.Close();
}
// add page to cache
CachePage(p);
return(p);
}
/// <summary>
/// Looks up a page in the database (recovers sections)
/// </summary>
/// <param name="ns">Namespace to look page up in</param>
/// <param name="title">Title of page to look up</param>
/// <param name="followRedirection">Whether or not to look up destination of redirect pages</param>
/// <returns>Page instance</returns>
public override Page LookupPage(WikiDB.Namespace ns, string title, bool followRedirection)
{
return(LookupPage(ns, title, followRedirection, true, true, true));
}