/// <summary>
/// Checks if a Url belongs to the part of the web we wish to crawl.
/// </summary>
/// <param name="targetUrl">The url to examine</param>
/// <returns>
/// A <see cref="DomainFlagValue"/> indicating whether the input Url belongs to the
/// part of the web we wish to crawl.
/// </returns>
/// <remarks>
/// Since it is possible for a url that belongs to a non-greek domain (e.g. .com) to
/// contain greek content, all Urls that do not belong to the .gr domain will get the
/// value of <see cref="DomainFlagValue.Unknown"/>. This allows the system to assign
/// them at a later time to a client who will visit them and check their content-type
/// encoding, in order to determine whether they are of interest to the system.
/// </remarks>
public DomainFlagValue FilterUrl(ref string targetUrl)
{
DomainFlagValue retVal = DomainFlagValue.Unknown;
try
{
mutex.WaitOne();
string targetHost = InternetUtils.HostName(targetUrl);
if (targetHost.EndsWith(".gr") || targetHost.Contains("ebay.com"))
{
retVal = DomainFlagValue.MustVisit;
}
else
{
if (IsIPAddress(ref targetHost))
{
if (ipTable.GetCountry(targetHost) == "GR")
{
retVal = DomainFlagValue.MustVisit;
}
}
}
}
catch (Exception e)
{
globals.FileLog.LogWarning(e.ToString());
}
finally
{
mutex.ReleaseMutex();
}
return(retVal);
}
/// <summary>
/// Constructs a new <see cref="InternetUrlToIndex"/> object from an existing <see cref="InternetUrlToIndex"/> object.
/// </summary>
/// <param name="IUrl">The existing <see cref="InternetUrlToIndex"/> object</param>
public InternetUrlToIndex(InternetUrlToIndex IUrl)
{
ID = IUrl.ID;
Url = IUrl.Url;
//m_UrlMD5=IUrlVal.MD5;
flagRobots = IUrl.FlagRobots;
flagDomain = IUrl.FlagDomain;
priority = IUrl.Priority;
}
/// <summary>
/// Constructs a new <see cref="InternetUrlToCrawl"/> object from an existing <see cref="InternetUrlToCrawl"/> object.
/// </summary>
/// <param name="IUrl">The existing <see cref="InternetUrlToCrawl"/> object</param>
public InternetUrlToCrawl(InternetUrlToCrawl IUrl)
{
ID = IUrl.ID;
Url = IUrl.Url;
//m_UrlMD5=IUrlVal.MD5;
crc = IUrl.CRC;
flagDomain = IUrl.FlagDomain;
flagFetchRobots = IUrl.FlagFetchRobots;
robotsDisallowedPaths = IUrl.RobotsDisallowedPaths;
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrlToCrawl"/> class.
/// </summary>
public InternetUrlToCrawl()
{
ID = 0;
//Url=String.Empty;
//MD5 = new byte[16]{0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0};
crc = 0L;
flagDomain = DomainFlagValue.Unknown;
flagFetchRobots = false;
robotsDisallowedPaths = String.Empty;
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrl"/> class.
/// </summary>
public InternetUrlToIndex()
{
ID = 0;
Url = String.Empty;
MD5 = new byte[16] {
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0
};
flagRobots = false;
flagDomain = DomainFlagValue.MustVisit;
priority = 255;
}
/// <summary>
/// Constructs an instance of the <see cref="UrlCrawlData"/> class and initializes
/// it with the default values.
/// </summary>
public UrlCrawlData()
{
url = new InternetUrlToCrawl();
updated = false;
redirected = false;
redirectedFlagRobots = false;
redirectedFlagDomain = DomainFlagValue.MustVisit;
redirectedPriority = 255;
httpStatusCode = HttpStatusCode.OK;
data = String.Empty;
timeStamp = DateTime.UtcNow;
retrievalTime = 0;
outLinks = null;//new ArrayList();
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrlToIndex"/> class that
/// points to a given Url and is associated with a given Identifier. All the
/// parameters of the newly created instance are supplied and initialized.
/// </summary>
/// <param name="ID">The unique identifier associated with this <see cref="InternetUrlToIndex"/></param>
/// <param name="url">The Url that this object encapsulates</param>
/// <param name="md5">The MD5 Hash Code for this <see cref="InternetUrlToIndex"/> object</param>
/// <param name="flagRobots">A boolean flag indicating whether it's allowed to visit the Url</param>
/// <param name="flagDomain">A <see cref="DomainFlagValue"/> flag indicating whether the Url belongs to the domain we wish to visit</param>
/// <param name="priority">A <see cref="System.Byte"/> flag indicating the url's crawling priority</param>
/// <exception cref="CWMalformedUrlException">
/// Thrown if the supplied string value is not a valid Url.
/// </exception>
public InternetUrlToIndex(int ID, string url, byte[] md5, bool flagRobots, DomainFlagValue flagDomain, byte priority)
{
Url = url; //this may throw an exception
this.ID = ID;
// try
// {
// Uri tmp = new Uri(UrlVal); //this may throw an exception
// Url = UrlVal;
// }
// catch
// {
// throw new CWMalformedUrlException("The address " + UrlVal + " is not a valid Uri.");
// }
MD5 = md5;
this.flagRobots = flagRobots;
this.flagDomain = flagDomain;
this.priority = priority;
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrlToIndex"/> class that
/// points to a given Url and is associated with a given Identifier. Assumes that
/// it's allowed to visit this Url (the <see cref="FlagRobots"/> property is set
/// to false) and that it belongs to the domain we wish to visit.
/// </summary>
/// <param name="ID">The unique identifier associated with this <see cref="InternetUrlToIndex"/></param>
/// <param name="url">The Url that this object encapsulates</param>
/// <exception cref="CWMalformedUrlException">
/// Thrown if the supplied string value is not a valid Url.
/// </exception>
public InternetUrlToIndex(int ID, string url)
{
Url = url; //this may throw an exception
this.ID = ID;
// try
// {
// Uri tmp = new Uri(UrlVal); //this may throw an exception
// Url = UrlVal;
// }
// catch
// {
// throw new CWMalformedUrlException("The address " + UrlVal + " is not a valid Uri.");
// }
//m_UrlMD5=MD5Hash.md5(UrlVal);
flagRobots = false;
flagDomain = DomainFlagValue.MustVisit;
priority = 255;
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrlToCrawl"/> class that
/// points to a given Url and is associated with a given Identifier. All of the
/// parameters of the newly created instance are supplied and initialized.
/// </summary>
/// <param name="ID">The unique identifier associated with this <see cref="InternetUrl"/>.</param>
/// <param name="url">The Url that this object encapsulates.</param>
/// <param name="md5">The MD5 Hash Code for this <see cref="InternetUrl"/> object.</param>
/// <param name="crc">The Cyclic Redundancy Check value associated with the <see cref="InternetUrl"/> object.</param>
/// <param name="flagDomain">A <see cref="DomainFlagValue"/> flag indicating whether the crawler must check the country of origin of the contents of the Url.</param>
/// <param name="flagFetchRobots">A boolean flag indicating whether a new copy of the robots.txt file related with this Url must be downloaded.</param>
/// <param name="robotsDisallowedPaths">A string containing the space-delimited paths on a host that the crawler must not visit.</param>
/// <exception cref="CWMalformedUrlException">
/// Thrown if the supplied string value is not a valid Uri.
/// </exception>
public InternetUrlToCrawl(int ID, string url, byte[] md5, long crc, DomainFlagValue flagDomain, bool flagFetchRobots, string robotsDisallowedPaths)
{
Url = url; //this may throw an exception
this.ID = ID;
// try
// {
// Uri tmp = new Uri(UrlVal); //this may throw an exception
// Url = UrlVal;
// }
// catch
// {
// throw new CWMalformedUrlException("The address " + UrlVal + " is not a valid Uri.");
// }
MD5 = md5;
this.crc = crc;
this.flagDomain = flagDomain;
this.flagFetchRobots = flagFetchRobots;
this.robotsDisallowedPaths = robotsDisallowedPaths;
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrlToCrawl"/> class that
/// points to a given Url and is associated with a given Identifier.
/// </summary>
/// <param name="ID">The unique identifier associated with this <see cref="InternetUrlToCrawl"/>.</param>
/// <param name="url">The Url that this object encapsulates.</param>
/// <exception cref="CWMalformedUrlException">
/// Thrown if the supplied string value is not a valid Uri.
/// </exception>
public InternetUrlToCrawl(int ID, string url)
{
Url = url; //this may throw an exception
this.ID = ID;
// try
// {
// Uri tmp = new Uri(UrlVal); //this may throw an exception
// Url = UrlVal;
// }
// catch
// {
// throw new CWMalformedUrlException("The address " + UrlVal + " is not a valid Uri.");
// }
//m_UrlMD5=MD5Hash.md5(UrlVal);
crc = 0L;
flagDomain = DomainFlagValue.Unknown;
flagFetchRobots = false;
robotsDisallowedPaths = String.Empty;
}
/// <summary>
/// Attempts to extract the appropriate FlagDomain value from the contents of the document.
/// </summary>
/// <param name="content">The HTML content that must be parsed for Domain Flag value.</param>
/// <returns>A <see cref="DomainFlagValue"/> indicating whether the content of the
/// text document is in the language that interests us.
/// </returns>
private DomainFlagValue ExtractDomainFlag(ref string content)
{
DomainFlagValue retVal = DomainFlagValue.Unknown;
try
{
//attempt to find any greek character in the contents of the document.
if (content.IndexOfAny(greekChars) != -1)
{
//a greek character was found, assume the content is in greek
retVal = DomainFlagValue.MustVisit;
}
else
{
retVal = DomainFlagValue.MustNotVisit;
}
}
catch
{}
return(retVal);
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrlToIndex"/> class that
/// points to a given Url and is associated with a given Identifier. All the
/// parameters of the newly created instance are supplied and initialized.
/// </summary>
/// <param name="ID">The unique identifier associated with this <see cref="InternetUrlToIndex"/></param>
/// <param name="url">The Url that this object encapsulates</param>
/// <param name="md5">The MD5 Hash Code for this <see cref="InternetUrlToIndex"/> object</param>
/// <param name="flagRobots">A boolean flag indicating whether it's allowed to visit the Url</param>
/// <param name="flagDomain">A <see cref="DomainFlagValue"/> flag indicating whether the Url belongs to the domain we wish to visit</param>
/// <param name="priority">A <see cref="System.Byte"/> flag indicating the url's crawling priority</param>
/// <exception cref="CWMalformedUrlException">
/// Thrown if the supplied string value is not a valid Url.
/// </exception>
public InternetUrlToIndex(int ID, string url, byte[] md5, bool flagRobots, DomainFlagValue flagDomain, byte priority)
{
Url = url; //this may throw an exception
this.ID = ID;
// try
// {
// Uri tmp = new Uri(UrlVal); //this may throw an exception
// Url = UrlVal;
// }
// catch
// {
// throw new CWMalformedUrlException("The address " + UrlVal + " is not a valid Uri.");
// }
MD5 = md5;
this.flagRobots = flagRobots;
this.flagDomain = flagDomain;
this.priority = priority;
}
/// <summary>
/// Constructs a new <see cref="InternetUrlToIndex"/> object from an existing <see cref="InternetUrlToIndex"/> object.
/// </summary>
/// <param name="IUrl">The existing <see cref="InternetUrlToIndex"/> object</param>
public InternetUrlToIndex(InternetUrlToIndex IUrl)
{
ID = IUrl.ID;
Url = IUrl.Url;
//m_UrlMD5=IUrlVal.MD5;
flagRobots = IUrl.FlagRobots;
flagDomain = IUrl.FlagDomain;
priority = IUrl.Priority;
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrl"/> class.
/// </summary>
public InternetUrlToIndex()
{
ID = 0;
Url = String.Empty;
MD5 = new byte[16] { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };
flagRobots = false;
flagDomain = DomainFlagValue.MustVisit;
priority = 255;
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrlToIndex"/> class that
/// points to a given Url and is associated with a given Identifier. Assumes that
/// it's allowed to visit this Url (the <see cref="FlagRobots"/> property is set
/// to false) and that it belongs to the domain we wish to visit.
/// </summary>
/// <param name="ID">The unique identifier associated with this <see cref="InternetUrlToIndex"/></param>
/// <param name="url">The Url that this object encapsulates</param>
/// <exception cref="CWMalformedUrlException">
/// Thrown if the supplied string value is not a valid Url.
/// </exception>
public InternetUrlToIndex(int ID, string url)
{
Url = url; //this may throw an exception
this.ID = ID;
// try
// {
// Uri tmp = new Uri(UrlVal); //this may throw an exception
// Url = UrlVal;
// }
// catch
// {
// throw new CWMalformedUrlException("The address " + UrlVal + " is not a valid Uri.");
// }
//m_UrlMD5=MD5Hash.md5(UrlVal);
flagRobots = false;
flagDomain = DomainFlagValue.MustVisit;
priority = 255;
}
/// <summary>
/// Constructs a new <see cref="InternetUrlToCrawl"/> object from an existing <see cref="InternetUrlToCrawl"/> object.
/// </summary>
/// <param name="IUrl">The existing <see cref="InternetUrlToCrawl"/> object</param>
public InternetUrlToCrawl(InternetUrlToCrawl IUrl)
{
ID = IUrl.ID;
Url = IUrl.Url;
//m_UrlMD5=IUrlVal.MD5;
crc = IUrl.CRC;
flagDomain = IUrl.FlagDomain;
flagFetchRobots = IUrl.FlagFetchRobots;
robotsDisallowedPaths = IUrl.RobotsDisallowedPaths;
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrlToCrawl"/> class that
/// points to a given Url and is associated with a given Identifier. All of the
/// parameters of the newly created instance are supplied and initialized.
/// </summary>
/// <param name="ID">The unique identifier associated with this <see cref="InternetUrl"/>.</param>
/// <param name="url">The Url that this object encapsulates.</param>
/// <param name="md5">The MD5 Hash Code for this <see cref="InternetUrl"/> object.</param>
/// <param name="crc">The Cyclic Redundancy Check value associated with the <see cref="InternetUrl"/> object.</param>
/// <param name="flagDomain">A <see cref="DomainFlagValue"/> flag indicating whether the crawler must check the country of origin of the contents of the Url.</param>
/// <param name="flagFetchRobots">A boolean flag indicating whether a new copy of the robots.txt file related with this Url must be downloaded.</param>
/// <param name="robotsDisallowedPaths">A string containing the space-delimited paths on a host that the crawler must not visit.</param>
/// <exception cref="CWMalformedUrlException">
/// Thrown if the supplied string value is not a valid Uri.
/// </exception>
public InternetUrlToCrawl(int ID, string url, byte[] md5, long crc, DomainFlagValue flagDomain, bool flagFetchRobots, string robotsDisallowedPaths)
{
Url = url; //this may throw an exception
this.ID = ID;
// try
// {
// Uri tmp = new Uri(UrlVal); //this may throw an exception
// Url = UrlVal;
// }
// catch
// {
// throw new CWMalformedUrlException("The address " + UrlVal + " is not a valid Uri.");
// }
MD5 = md5;
this.crc = crc;
this.flagDomain = flagDomain;
this.flagFetchRobots = flagFetchRobots;
this.robotsDisallowedPaths = robotsDisallowedPaths;
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrlToCrawl"/> class that
/// points to a given Url and is associated with a given Identifier.
/// </summary>
/// <param name="ID">The unique identifier associated with this <see cref="InternetUrlToCrawl"/>.</param>
/// <param name="url">The Url that this object encapsulates.</param>
/// <exception cref="CWMalformedUrlException">
/// Thrown if the supplied string value is not a valid Uri.
/// </exception>
public InternetUrlToCrawl(int ID, string url)
{
Url = url; //this may throw an exception
this.ID = ID;
// try
// {
// Uri tmp = new Uri(UrlVal); //this may throw an exception
// Url = UrlVal;
// }
// catch
// {
// throw new CWMalformedUrlException("The address " + UrlVal + " is not a valid Uri.");
// }
//m_UrlMD5=MD5Hash.md5(UrlVal);
crc = 0L;
flagDomain = DomainFlagValue.Unknown;
flagFetchRobots = false;
robotsDisallowedPaths = String.Empty;
}
/// <summary>
/// Constructs a new instance of the <see cref="InternetUrlToCrawl"/> class.
/// </summary>
public InternetUrlToCrawl()
{
ID = 0;
//Url=String.Empty;
//MD5 = new byte[16]{0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0};
crc = 0L;
flagDomain = DomainFlagValue.Unknown;
flagFetchRobots = false;
robotsDisallowedPaths = String.Empty;
}
/// <summary>
/// Constructs an instance of the <see cref="UrlCrawlData"/> class and initializes
/// it with the default values.
/// </summary>
public UrlCrawlData()
{
url=new InternetUrlToCrawl();
updated=false;
redirected=false;
redirectedFlagRobots = false;
redirectedFlagDomain = DomainFlagValue.MustVisit;
redirectedPriority = 255;
httpStatusCode=HttpStatusCode.OK;
data=String.Empty;
timeStamp=DateTime.UtcNow;
retrievalTime=0;
outLinks=null;//new ArrayList();
}