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This private method carries out actions once a link has been crawled. It removes the link from the queue of links to visit, adds it to the set of visited links, and adds its host to the set of visited hosts:

As you can see, this is just a straightforward class implementation. The idea is that your custom code to define a WCF service exists outside of your implementation code, and is configured via a Web.config file. This means that the business logic developers concentrate on the business logic and don t wrap it up in the plumbing. It s a very neat aspect of the WCF design that will make the implementation of enterprise-grade services easy. Next, you build the operation itself. Here s the code:

You can override these properties and methods and write your own data-manipulation logic. If you do not want to override a particular property or method, you still need to have its empty implementation. A better way is to throw an exception in such properties and methods so that the caller knows that these properties and methods are not implemented by you. I will not discuss every property here because you are already familiar with many of them (see 3 for more information).

private void visited(URL link) { links.remove(link); visited.add(link); visitedHosts.add(link.getHost()); }

This private method processes a buffer containing an HTML page. The context is provided so that relative URLs can be resolved to their absolute URLs. HREFs within the HTML are extracted, converted to absolute URLs, and added to the queue of links to be crawled (if they have not already been visited and have not been forbidden by a robots.txt file):

public string GetAddresses(string strZIP) { string strReturn = ""; AddressDataTableAdapters.AddressTableAdapter da = new AddressDataTableAdapters.AddressTableAdapter(); AddressData.AddressDataTable dt = da.GetData(strZIP); strReturn = FormatDTasXML(dt); return strReturn; }

Now that you are familiar with the XmlReader abstract class, let s create our own implementation. To do so, create a new project of type class library by using Visual Studio. Add a class named TableReader. Make sure that references to the System.Xml and System.Data assemblies are added to the project. Import the namespaces as shown in Listing A-2 at the top of the TableReader class and ensure that the TableReader class inherits from the XmlReader class. Listing A-2. Importing Namespaces and Setting Inheritence using System.Xml; using System.Data; using System.Data.OleDb; class TableReader:XmlReader { ...

private void processBuffer(StringBuffer buffer, URL url) {

This takes in a string, the ZIP code, and uses it as a parameter in pulling the address data (as a DataTable) from the AddressTableAdapter, which is implemented by the DataSet. Then it sends this data to a helper function to format it as XML and serialize it into a string. This string will then be returned by the service. Here s the listing for this helper function:

Let s now prepare to gather up potential URL strings:

You need to add an implementation of each property and method mentioned. Visual Studio provides a shortcut for adding empty implementations of these members. Right-click on the XmlReader class in the class definition and choose the Implement Abstract Class menu option (Figure A-1).

private string FormatDTasXML(AddressData.AddressDataTable dt) { MemoryStream memStream = null; XmlTextWriter xmlWriter = null; try { memStream = new MemoryStream(); xmlWriter = new XmlTextWriter(memStream, Encoding.Unicode); dt.WriteXml(xmlWriter); int count = (int)memStream.Length; byte[] arr = new byte[count]; memStream.Seek(0, SeekOrigin.Begin); memStream.Read(arr, 0, count); UnicodeEncoding utf = new UnicodeEncoding(); return utf.GetString(arr).Trim();

List foundHREFs = new ArrayList();

Figure A-1. Adding empty implementations of properties and methods This will add dummy signatures of all the properties and methods that need to be overridden. Notice how the dummy implementation throws an exception by using the throw keyword. This way, if somebody tries to use unimplemented members, an exception will be thrown indicating that the method or operation is not implemented. Code the TableReader class as shown in Listing A-3. Listing A-3. The TableReader Class public class TableReader:XmlReader { private OleDbConnection cnn; private OleDbCommand cmd; private OleDbDataReader reader; private int intColumnIndex = -1; private string strValue; public TableReader(string connectionString,string tableName) { cnn = new OleDbConnection(connectionString); cmd = new OleDbCommand(); cmd.Connection = cnn; cmd.CommandText = tableName; cmd.CommandType = CommandType.TableDirect; cnn.Open(); reader = cmd.ExecuteReader(); }