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<h:outputText value="#{userBeansportsInterests['Swimming']}"/>
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Incidentally, it is possible to display all of the key/value pairs for a Map by simply referring to the Map in the expression: #{userBeansportInterests} This causes the entire map to be converted to a single string that contains all keys and values
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Managed Beans and the JSF Expression Language
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Element <managed-property> <property-name> <property-class> <map-entries> <key-class> <value-class>
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Description Same as before, the parent element for managed properties
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PARTIII PART PART
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The name of the property JSF uses the default type of HashMap, but any other Map concrete class could be specified here Parent element of <key-class>, <value-class>, and Map entries Element specifying data type of the keys used in the map When not specified, a javalangString is used as a default (Optional) Element specifying data type of the values used in the map When not specified, a javalangString is also used as a default (Optional) Parent element to a Map key/value element pair The key value used to look up an associated value The <value> element that is retrieved when the associated key is supplied To initialize a Map property to a null value, a <nullvalue> tag is used Note: The <null-value> element cannot be used for primitive data types
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<map-entry>(1 to N) <key> <value> or <null-value>
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TABLE 5-4
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Managed Property Elements for a Map
A more formalized listing of the elements needed for a managed Map property follows in Table 5-4 In Table 5-4, notice that the type of the key and value are specified by <key-class> and <value-class>, respectively However, both are optional, with both defaulting to javalang String For this reason, the types of the key and value in the previous example were of the default String data type The next example uses a key class of type javalangInteger In this example, the key/value pairs consist of an integer ZIP code and the string name of the city in which that ZIP code is found
<managed-bean> <managed-property> <property-name>cityRegistry</property-name> <map-entries> <key-class>javalangInteger</key-class> <map-entry> <key>94065</key> <value>Redwood City</value> </map-entry> <map-entry> <key>95118</key> <value>San Jose</value> </map-entry>
Part I:
The JavaServer Faces Framework
<map-entry> <key>32801</key> <value>Orlando</value> </map-entry> </map-entries> </managed-property> </managed-bean>
Declaring Lists and Maps Directly as Managed Beans
So far we have examined cases where existing beans had certain properties of type List or Map registered as managed properties In fact, it is possible to declare brand new Lists or Maps as managed beans entirely from the Faces configuration file This is achieved by assigning the <managed-bean-class> directly as either a List or a Map
NOTE When declaring a managed bean directly as a List or a Map, you must use the concrete class
types javautilArrayList or javautilHashMap since it is impossible to call a constructor on an interface The following example shows a List being declared entirely as a managed bean
<managed-bean> <managed-bean-name>moreSports</managed-bean-name> <managed-bean-class>javautilArrayList</managed-bean-class> <managed-bean-scope>none</managed-bean-scope> <list-entries> <value>Skiing</value> <value>Tennis</value> <value>Rollerblading</value> </list-entries> </managed-bean>
Notice that the <managed-bean-scope> is set to none This simply means that this managed bean is not stored anywhere Instead, it is instantiated on the fly whenever needed The lifecycles of managed beans are examined more closely a little later in the chapter, after you have seen how managed beans can be dependent on each other
Managed Bean Interdependence
One of the most common criteria for IoC containers is that they be able to handle interdependencies between managed objects The JavaServer Faces Managed Bean Facility does not fall short in this regard Setting dependencies between managed beans can easily be done using the JSF expression language Consider the previous example where we declared a brand new moreSports managed bean from scratch that listed a new set of sports as moreSports This list can now be referred to in another bean through an expression For example, you can add the values from the new list to the existing sportsInterests managed bean with the final result being a set of values from both lists
5:
Managed Beans and the JSF Expression Language
<managed-bean> <managed-property> <property-name>sportsInterests</property-name> <list-entries> <value>Cycling</value> <value>Running</value> <value>Swimming</value> <value>Kayaking</value> <value>#{moreSports[0]}</value> <value>#{moreSports[1]}</value> <value>#{moreSports[2]}</value> </list-entries> </managed-property> </managed-bean>
PARTIII PART PART
For a more general example of managed bean interdependency, consider a new custom class of type comjsfcomprefmodelAddress that contains String properties for street, city, and zipCode It can be registered as an independent managed bean using
<managed-bean> <managed-bean-name>addressBean</managed-bean-name> <managed-bean-class>comjsfcomprefmodelAddress </managed-bean-class> <managed-bean-scope>none</managed-bean-scope> </managed-bean>
Recall that a scope of none means that this bean is not initialized until requested by another managed bean Next, you could add two new properties homeAddress and shippingAddress of type comjsfcomprefmodelAddress to the original UserBean You can then define these properties by using the following code:
<managed-bean> <managed-bean-name>userBean</managed-bean-name> <managed-bean-class>comjsfcomprefmodelUserBean</managed-bean-class> <managed-bean-scope>session</managed-bean-scope> <managed-property> <property-name>homeAddress</property-name> <value>#{addressBean}</value> </managed-property> <managed-property> <property-name>shippingAddress</property-name> <value>#{addressBean}</value> </managed-property> <managed-property> <property-name>firstName</property-name> </managed-property> </managed-bean>
Part I:
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