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IT SHOULD BE possible to build a portal by plugging components from different vendors into a portal from any vendor. These components are portlets, and we explain how to build them in this book. The noble aim of the portlet specification which arose from Sun s Java Community Process with the collaboration of Sun, IBM, BEA, and others was to simplify the process of tying applications into a portal by allowing them to cooperate. That so many vendors have come together to standardize their existing proprietary solutions bodes well for the future of this technology. We believe that portlets and the portlet API will become at least as important to Java application developers as the servlet API has been because portlets make building a truly integrated system that much easier. Any new portal development projects should select a portal that supports the portlet API because independent software vendors now need to write portlets for only one API, not a dozen. Both of us enjoy working with new technology, and there are a lot of new standards for portals, content management systems, business rules, and web services. We hope that you will enjoy learning about portal development as much as we enjoyed writing this book!

In this example, you will look at creating a simple JavaScript class that represents a boat. The syntax may look a little strange at first, but you ll quickly get used to it however, in order to understand what is going on, it s a good idea to go through it step by step. So, here goes! The first line in your class should be where you register the namespace for the class. In this case, we are creating a Boat class, which is going to be in the namespace Vehicles, so we register the Vehicles namespace like this:

When retrieving preferences using the getValue() and getValues() methods, be sure to pass in a non-null value for the key, or each method will throw an IllegalArgumentException.

Connection (SqlConnection and OleDbConnection)

Type.registerNamespace("Vehicles");

Portlets can create new preferences for users, or modify preferences that are not marked read-only. Portlets can also remove a preference for a user or, if the preference has a default, return it to that initial default value. Before modifying a preference, a portlet should check to see whether the preference is marked read-only and is nonmodifiable by the end user. The isReadOnly() method on the PortletPreferences object takes the name of the preference as an argument and returns true if the preference is read-only. The preference can be marked read-only either in the deployment descriptor or through another administration tool provided by the portal container. If the preference is not in the deployment descriptor and the preference is not marked read-only by the portal container, the isReadOnly() method will return false. The portlet can modify or create the portlet preference.

As the name suggests, the Connection classes represent a connection with a database. The use of the ADO.NET Connection object is similar to its ADO counterpart. For example, in order to establish a connection with a SQL Server database, you will need to specify the connection string and then call the Open() method of the SqlConnection object. Note that after you finish working with the Connection object, you should explicitly close it by using the Close() method. Otherwise, the object will maintain a live connection with the database.

public boolean isReadOnly(String key)

The next step is to define the class constructor. You can overload this in ASP.NET AJAX JavaScript, but for the sake of simplicity, we ll keep it with a single constructor. Here s an example:

Portlets may set preferences during an action request. There are two methods for setting preferences, one for String object values and the other for String array values. Both will throw a ReadOnlyException if the preference is marked read-only in the deployment descriptor. These methods also must have a name for the preference that is not null, or they will throw an IllegalArgumentException. They may also throw that exception if the length of the name or the value is longer than the portal container allows.

Command (SqlCommand and OleDbCommand)

Vehicles.Boat = function(boatType, boatSize, boatName) { this._boatType = boatType; this._boatSize = boatSize; this._boatName = boatName; }

The portlet API provides the reset() method for removing portlet preferences. If a default value is specified for that preference, the preference cannot be removed but can only be reset to the default value. If the value is read-only, it cannot be removed or reset, and the reset(String key) method will throw a ReadOnlyException:

ADO.NET Command objects are similar to ADO Command objects in that they are used to execute SQL queries and stored procedures. You specify the SQL query or stored procedure name by using the CommandText property. You can also specify the type of command (SQL statement or stored procedure) by using the CommandType property. If your query has some parameters, you can add them to the Parameters collection. Before executing the command, you should set its Connection property to an open connection object. Command objects can return only read-only and forward-only result sets in the form of a DataReader.