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Figure 5-4. Visual Studio also assists in implementing the INotifiyPropertyChanged interface. Now Visual Studio has added a new public event to your class: public class Book : INotifyPropertyChanged { public string Title { get; set; } public string ISBN { get; set; } public event PropertyChangedEventHandler PropertyChanged; } 8. Next, you need to create a convenience method that will fire the PropertyChanged event. Call it FirePropertyChanged, as shown in the following code: public class Book : INotifyPropertyChanged { public string Title { get; set; } public string ISBN { get; set; } public event PropertyChangedEventHandler PropertyChanged; void FirePropertyChanged(string property) { if (PropertyChanged != null) {

Listing 4-1. Using OR Operations SELECT e.MemberID FROM Entry e WHERE e.TourID= 36 OR e.TourID= 38 OR e.TourID= 40

As mentioned in the preceding section, ApplicationContext implementations allow for file-like resources to be injected based on path strings given in the configuration file. This capability arises from the ResourceLoader superinterface. For a file-like resource to be injectable on a bean, the receiving property must be specified as an implementation of the org.springframework.core.io.Resource interface. The resource type to be used will be determined by looking for the prefix on the property value.

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Clearly, the sort of expression shown in Listing 4-1 will start to become unwieldy as the number of possible options grows. Using the IN keyword, we can construct a more compact statement, as in Listing 4-2, where the set of possible values are enclosed in parentheses and separated by commas. Each row of Entry is investigated, and if TourID is one of the values in the set, then the WHERE condition is true, and that row will be returned.

PropertyChanged(this, new PropertyChangedEventArgs(property)); } } 9. Now you need to extend the simplified properties by adding private members and full get/set definitions to define the get and set operations, as shown in the following code. The get is just like a normal get operation, where you simply return the internal member value. For the set, you first set the internal member value, and then call the FirePropertyChanged method, passing it the name of the property. public class Book : INotifyPropertyChanged { private string _title; private string _isbn; public string Title { get { return _title; } set { _title = value; FirePropertyChanged("Title"); } } public string ISBN { get { return _isbn; } set { _isbn = value; FirePropertyChanged("ISBN"); } } public event PropertyChangedEventHandler PropertyChanged; }

<bean id="describer" class="com.apress.coupling.ResourceConsumer"> <property name="resources"> <list> <value>classpath:config.xml</value> <value>file:config.xml</value> <value>http://example.com/config.xml</value> <value>ftp://config.xml</value> <value>config.xml</value> </list> </property> </bean> Listing 3-23 shows the implementation of the resources property setter.

Listing 4-2. Using the IN Keyword SELECT e.MemberID FROM Entry e WHERE e.TourID IN (36, 38, 40)

void FirePropertyChanged(string property) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(property)); } }

public void setResources(final List<Resource> resources) { this.resources = resources; } The Resource interface provides methods allowing a file or URL object to be obtained for the resource, but an exception will be thrown if the resource is not available in the selected form. However, the interface also extends the InputStreamSource interface that allows an InputStream to be obtained from the resource. This method will fail only if the underlying resource does not exist or is inaccessible. The first four examples given in Listing 3-22 are returned (respectively) as a resource from the classpath of the application, from the file system relative to the working directory, as a web request, and as an FTP transfer. The last value, for a named resource with no prefix, is ambiguous; the resource returned will depend on the factory that the bean is hosted within. For example, for the ClassPathXmlApplicationContext used in Listing 3-7, the configuration file would be obtained as a resource from the classpath. Other application context types may return other resource types typically, file resource types from appropriate directory roots.

We can combine IN with the logical operator NOT, as shown in Listing 4-3. The query will return all the IDs of members who have entered any tournament that is not in the list. We will look more carefully at using NOT later in the chapter.

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