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Depending upon the desired content of a WDDX packet, you can call either the wddx_serialize_value() function or the wddx_serialize_vars() function. Each of these functions creates a complete WDDX packet using a single line of code. The simplest of these functions is wddx_serialize_value(). It takes a single parameter (a variable whose value is to be serialized) and an optional string to add a comment to the header element, returning the resulting WDDX packet. This function is useful only when you want to exchange a single unnamed data type with another system. For example: $myArray = array(1,2,3); print wddx_serialize_value($myArray, 'This is an un-named array'); <wddxPacket version='1.0'> <header> <comment>This is an un-named array</comment> </header> <data> <array length='3'> <number>1</number> <number>2</number> <number>3</number> </array> </data> </wddxPacket> The more commonly used wddx_serialize_vars() function, demonstrated in Listing 15-1, allows for an arbitrary number of variables to be serialized by name all at once. A struct element is automatically created, and each variable passed to the function is created as a var element mapping the name of the variable to the name attribute on the var element. The only task you cannot perform using this function is adding a comment to the header. This, in my opinion, is minor compared to how easily you can create a packet. In any case, you could use

CHAPTER 15 WEB DISTRIBUTED DATA EXCHANGE (WDDX)

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the second method of creating a packet, covered in the next section, if a comment is absolutely necessary. Listing 15-1. Serializing Variables in WDDX < php class myClass { public $prop1; public $prop2 = 'default'; public $prop3 = 0; /* Additional functionality here */ } $objMyClass = new myClass(); $objChildClass = new myClass(); /* Set prop1 to the $objChildClass */ $objMyClass->prop1 = $objChildClass; $myInteger = 2; /* Serialize the variables The variable names are passed not the actual variables */ $output = wddx_serialize_vars('myInteger', 'objMyClass'); print $output > The script in Listing 15-1 demonstrates the serialization of a variable containing an integer, $myInteger, and an object, $objMyClass, that has its prop1 property set to another object of the same class. All the variables to be serialized are passed at once, passing their names, not the actual variables, to the wddx_serialize_vars() function. The function returns the resulting WDDX packet, which is shown here: <wddxPacket version="1.0"> <header/> <data> <struct> <var name="myInteger"> <number>2</number> </var> <var name="objMyClass"> <struct> <var name="php_class_name"> <string>myClass</string> </var>

In this chapter, you learned how to validate user input To validate the user input in a single UI Input component, you can add one or more validators to it They will be invoked one by one in the Process Validations phase to check the converted value If any one fails, it will log an error for that component (or rather, for its client ID) and tell the JSF engine to jump to the Render Response phase directly As you learned, JSF provides a few predefined validators for checking the range of a long, the range of a double, or the length of a string To customize their error messages, use a message bundle or provide the message directly in the validator tag To perform custom validation, you learned that you can create a custom validator by providing a Java class and a validator ID.

Start by creating a SharePoint site. This site will be used for all of the projects in this book. Use the Team Site template, as shown in Figure 2-1. This will create some standard lists, such as Tasks, Calendar, and Shared Documents, that will be useful for managing projects.

CHAPTER 15 WEB DISTRIBUTED DATA EXCHANGE (WDDX)

<var name="prop1"> <struct> <var name="php_class_name"> <string>myClass</string> </var> <var name="prop1"> <null/> </var> <var name="prop2"> <string>default</string> </var> <var name="prop3"> <number>0</number> </var> </struct> </var> <var name="prop2"> <string>default</string> </var> <var name="prop3"> <number>0</number> </var> </struct> </var> </struct> </data> </wddxPacket> From the output you can see both the myInteger variable and the objMyClass variable set as the var elements beneath the topmost struct element. What is of interest is the structure created for objMyClass. This is an object serialized into a struct element. You are most likely wondering where the var elements with the name attribute set to php_class_name originated. Anytime an object is serialized using the wddx extension, a var element with the name attribute set to php_class_name is added as the first child element of the object s struct element. The value of the element is a string element containing the name of the class from which the object was instantiated. This way when the packet is unserialized, the object can be instantiated in the values returned. I will demonstrate how to do this in the Unserializing Data section.

Remember, SimpleXML will not add elements to a tree. Using the interoperability of the XML-related Tip

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