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And look for HREF tokens. Any token immediately following an HREF is presumed to be (potentially) a URL:

} catch { return String.Empty; } finally { if (xmlWriter != null) xmlWriter.Close(); } }

StringTokenizer tokenizer = new StringTokenizer(buffer.toString(),DELIM);

public override int AttributeCount { get { return reader.FieldCount; } } public override void Close() { reader.Close(); cnn.Close(); } public override int Depth { get { return reader.Depth; } } public override string GetAttribute(int i) { return reader.GetValue(i).ToString(); } public override string GetAttribute(string name) { return reader.GetValue(reader.GetOrdinal(name)).ToString(); } public override bool MoveToAttribute(string name) { intColumnIndex = reader.GetOrdinal(name); return true; } public override bool MoveToElement() { intColumnIndex = -1; return true; }

The DataTable has the facility to write XML to an XMLWriter. This XMLWriter can then write to a memory stream that can be read out as a string. Thus, the XML is loaded into a string that can be returned. And as the string is a simple data type, it can be passed across the wire without a DataContract. Now, to control how this service behaves, you ll use the Web.config file. Here s a sample Web.config file that will work with this service. You ll build on this later to provide attributes such as security to your service.

3

public override bool MoveToFirstAttribute() { intColumnIndex = 0; return true; } public override bool MoveToNextAttribute() { intColumnIndex++; if (intColumnIndex > reader.FieldCount - 1) { return false; } else { return true; } } public override bool Read() { intColumnIndex = -1; strValue = ""; return reader.Read(); } public override bool HasValue { get { return reader.IsDBNull(intColumnIndex); } } public override bool ReadAttributeValue() { if (intColumnIndex < reader.FieldCount) { strValue = reader.GetValue(intColumnIndex).ToString(); return true; } else { return false; } }

while(tokenizer.hasMoreElements()) { String element = tokenizer.nextToken(); if( element.equalsIgnoreCase(HREF) && tokenizer.hasMoreElements() ) { String path = tokenizer.nextToken(); foundHREFs.add(path); } }

< xml version="1.0" > <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <connectionStrings> <add name="AdventureWorksConnectionString" connectionString="Data Source=BOOKDEV\SQLEXPRESS; Initial Catalog=AdventureWorks;Integrated Security=True" providerName="System.Data.SqlClient" /> </connectionStrings> <system.serviceModel> <services> <service name="AddressService" behaviorConfiguration="AddressServiceTypeBehaviors"> <endpoint contract="IAddressService" binding="wsHttpBinding"/> </service> </services> <behaviors>

Now let s boil them down to absolute URLs:

<serviceBehaviors> <behavior name="AddressServiceTypeBehaviors" > <serviceMetadata httpGetEnabled="true" /> </behavior> </serviceBehaviors> </behaviors> <bindings> </bindings> </system.serviceModel> <system.web> <compilation debug="true"/> </system.web> </configuration>

public string Name { get { if (intColumnIndex == -1) { return cmd.CommandText; } else { return reader.GetName(intColumnIndex); } } } public override string Value { get { return strValue; } } ... } In the following text, we will dissect the code step by step.

Set absolute = new HashSet(); Iterator i = foundHREFs.iterator(); while(i.hasNext()) { String path = (String)i.next(); try { URL toAdd = new URL(url,path); if( !toAdd.getProtocol().equalsIgnoreCase("http") ) {

The important thing to remember here is the <service> node and how it is used to set up the service. Look at this node:

If it s not a link beginning with http then it s not a protocol we re interested in:

private private private private private OleDbConnection cnn; OleDbCommand cmd; OleDbDataReader reader; int intColumnIndex = -1; string strValue;

} else { absolute.add(toAdd); } } catch( MalformedURLException e ) {

<service name="AddressService" behaviorConfiguration="AddressServiceTypeBehaviors"> <endpoint contract="IAddressService" binding="wsHttpBinding"/> </service>

The TableReader class declares private variables of type OleDbConnection, OleDbCommand, and OleDbDataReader classes at the class level: The OleDbConnection class is used to establish a connection with OLEDB-compliant databases such as Access. The OleDbCommand class is used to execute any query, SQL query, or stored procedures against a database. The OleDbDataReader class allows you to iterate through a result set in a cursor-oriented manner. The intColumnIndex integer variable keeps track of the current column index whose value is to be read. Similarly, the strValue string variable stores the value from the column indicated by intColumnIndex.

If we encounter a MalformedURLException, then the crawler must have tried to load an invalid path. We should ignore the URL as it s probably a typo: