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As shown previously, some conversion attempts are not successful, and raise an InvalidCastException exception at run time. Instead of blindly attempting a conversion, you can use the is operator to check whether a conversion would complete successfully. The syntax of the is operator is the following, where Expr is the source expression: Returns a bool Expr is TargetType The operator returns true if Expr can be successfully converted to the target type through any of the following: A reference conversion A boxing conversion An unboxing conversion For example, in the following code, you use the is operator to check whether variable bill of type Employee can be converted to type Person, and then take the appropriate action. class Employee : Person { } class Person { public string Name = "Anonymous"; public int Age = 25; } class Program { static void Main() { Employee bill = new Employee(); Person p; // Check if variable bill can be converted to type Person if( bill is Person ) { p = bill; Console.WriteLine("Person Info: {0}, {1}", p.Name, p.Age); } } } The is operator can only be used for reference conversions and boxing and unboxing conversions. It cannot be used for user-defined conversions.

# Uncomment the next three lines to update the server and port to # the alsb_prod environment correctly #query = EnvValueQuery(None, Collections.singleton(EnvValueTypes.URI_ENV_VALUE_TYPE), collection, false, '192.168.1.100:7001', false) #customEnv = FindAndReplaceCustomization('Update to the correct server and port number', query, 'localhost:7101') #customList.add(customEnv) print 'EnvValueCustomization created' print customList aFile = File(customFile) out = FileOutputStream(aFile) Customization.toXML(customList, out) out.close() print "ALSB Dummy Customization file: "+ customFile + " has been created" except: raise #=================================================================================== # Utility function to load properties from a config file #=================================================================================== def loadProps(configPropFile): propInputStream = FileInputStream(configPropFile) configProps = Properties() configProps.load(propInputStream) return configProps #================================================================================== # Connect to the Admin Server #================================================================================== def connectToServer(username, password, url): connect(username, password, url) domainRuntime() # EXPORT script init try: exportAll(sys.argv[1]) except: print "Unexpected error: ", sys.exc_info()[0] dumpStack() raise

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The second assembly contains the declaration of a class called DerivedClass, which inherits from MyBaseClass, declared in the first assembly. The source file is named Assembly2.cs. Figure 7-14 illustrates the two assemblies. DerivedClass has an empty body but inherits method PrintMe from MyBaseClass. Main creates an object of type DerivedClass and calls its inherited method PrintMe. // Source file name Assembly2.cs using System; using BaseClassNS; Namespace containing declaration of base class namespace UsesBaseClass { Base class in other assembly class DerivedClass: MyBaseClass { // Empty body } class Program { static void Main( ) { DerivedClass mdc = new DerivedClass(); mdc.PrintMe(); } } } This code produces the following output:

Class accessibility was covered earlier in the chapter. With class accessibility, there are only two modifiers internal and public. This section covers member accessibility. Class accessibility describes the visibility of a class; member accessibility describes the visibility of class members. Each member declared in a class is visible to various parts of the system, depending on the access modifier assigned to it in the class declaration. You ve seen that private members are visible only to other members of the same class, while public members can be visible to classes outside the assembly as well. In this section, we will look again at the public and private access levels, as well as the three other levels of accessibility. Before looking at the specifics of member accessibility, there are some general things we need to cover first: All members explicitly declared in a class s declaration are visible to each other, regardless of their accessibility specification. Inherited members are not explicitly declared in a class s declaration, so, as you shall see, inherited members might or might not be visible to members of a derived class. There are five member access levels: public private protected internal protected internal You must specify member access levels on a per-member basis. If you don t specify an access level for a member, its implicit access level is private. A member cannot be more accessible than its class. That is, if a class has an accessibility level limiting it to the assembly, individual members of the class cannot be seen outside the assembly, regardless of their access modifiers.

There are two critical commands highlighted in Listing 12-3 The first is the EnvValueQuery() command In reality, this is not just a command in a script; it is the Java constructor for the EnvValueQuery class, which is found in the package combeawliconfigenv This class allows you to specify the type of information you are looking for In our example, we were looking for endpoint URIs ALSB does not differentiate between endpoint URIs and any other URI By passing in EnvValueTypesURI_ENV_VALUE_TYPE, we can confine our search to URIs within the system If you passed a null value here instead, you would end up searching all types of environment values Of course, you can look for other specific types of data If you examine the Javadoc for the combeawlisbutil.

During the development cycle, you may change your object model frequently. It isn t efficient to destroy and rebuild the schema every time. The schemaupdate task updates an existing database schema: <target name="schemaupdate"> <taskdef name="schemaupdate" classname="org.hibernate.tool.hbm2ddl.SchemaUpdateTask" Classpathref="hibernate-Classpath" /> <schemaupdate config="${build.dir}/hibernate.cfg.xml" text="no"/> </target>

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