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The last of the three standard markup tags for conversion is <f:converter> This tag allows associating an arbitrary converter with a component using the converter ID lookup mechanism Previously, we mentioned that converters can be registered and looked up by class They can also be registered and looked up by converter-id, registered in the facesconfigxml file for the application Table 8-1 lists the standard converters and their converter IDs While it s certainly possible to use the <f:converter> tag with the standard converters, it is really intended to provide a gateway to custom converters without requiring the creation of a custom converter tag For example, the Virtual Trainer example uses a custom WeightConverter that consults the user s preferences and displays weights in either metric or English units For example:
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<h:inputText id="targetWeight" value="#{usertargetWeight}"> <f:converter converterId="weight"/> </h:inputText>
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The final way to associate a Converter with a UIComponent is programmatically Nearly all of the markup tags in Faces serve only to expose the underlying component model to the markup page author In the case of the converter tags, this can mean that the setConverter( ) method of a ValueHolder instance is called The existence of a setConverter( ) method means that you can call it directly, if you are so inclined When using this approach, you must be aware of when in the request processing lifecycle your code is executing Also, this approach violates the separation of controller from view in the MVC paradigm because a priori knowledge of the view is required to find the components on which to install the converters With these cautions, we include this approach here for completeness As mentioned earlier, conversion happens twice during the lifecycle, once during the Apply Request Values or Process Validations phase, and again during the Render Response phase Beginning with JSF 12, if you want your Converter to be used during the whole lifecycle, try using a UIViewRoot PhaseListener registered for the beforePhase event of the Render Response phase This will ensure that the Converter is installed before the first rendering and that it remains installed throughout the life of the view thanks to the state management APIs Once you know when in the lifecycle your converter installing code will execute, it s a matter of creating and installing it in the desired component The following example shows how to programmatically create and install a converter on two components in the view One component uses by-type converter lookup, and the other uses by-class converter lookup
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FacesContext context = FacesContextgetCurrentInstance( ); Converter intConverter = null; Converter floatConverter = null; UIComponent component1 = null; UIComponent component2 = null; UIViewRoot root = contextgetViewRoot( ); // Find the components on which we'll install the Converters component1 = (ValueHolder) rootfindComponent("form" + NamingContainerSEPARATOR_CHAR + "intComponent");
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Programmatically Associating a Converter with a UIComponent
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component2 = (ValueHolder) rootfindComponent("form" + NamingContainerSEPARATOR_CHAR + "floatComponent"); // Create the Converters, one by type, the other by Class intConverter = contextgetApplication( )createConverter("javaxfacesInteger"); floatConverter = contextgetApplication( )createConverter(Floatclass); // Install the converters component1setConverter(intConverter); component2setConverter(floatConverter);
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The main point of this example is to show the two variants of createConverter( ) and the use of setConverter( )
The Lifetime of a Converter
Even though the Java platform provides automatic memory management in the form of garbage collection, it is still very important to be mindful of the memory implications of the design decisions that you make as you develop your application This is particularly important when using a framework, where objects are frequently instantiated on the user s behalf without the user s knowledge As described in the preceding section, each UIComponent instance in the view may have zero or one Converter associated with it, and there are several ways to make that association The lifetime implications of these different ways are the subject of this section
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