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Another similar, yet, more refined implementation omits the use of PythonInterpreter and instead makes use of PySystemState. Why would we want another implementation that produces the same results Well, there are a couple of reasons. The loosely coupled object factory design I described in the beginning of this section instantiates the PythonInterpreter and then makes calls against it. This can cause a decrease in performance, as it is quite expensive to use the interpreter. On the other hand, we can make use of PySystemState and save ourselves the trouble of incurring extra overhead making calls to the interpreter. Not only does the next example show how to utilize this technique, but it also shows how we can make calls upon the coerced object and pass arguments at the same time. Listing 10-5. Use PySystemState to Code a Loosely Coupled Factory JythonObjectFactory.java package org.jython.book.util; import org.python.core.Py; import org.python.core.PyObject; import org.python.core.PySystemState; /** * Jython Object Factory using PySystemState */ public class JythonObjectFactory { private final Class interfaceType; private final PyObject klass; // Constructor obtains a reference to the importer, module, and the class name public JythonObjectFactory(PySystemState state, Class interfaceType, String moduleName, String className) { this.interfaceType = interfaceType; PyObject importer = state.getBuiltins().__getitem__(Py.newString("__import__")); vb.net code 39 reader VB . NET Image: Example to Read Code 39 Barcode with VB . NET Codes in ...
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NET Code 39 barcode Reader Control is an advanced developer-library for . NET class ... NET Code 39 barcode scanner can read barcode images using VB . PyObject module = importer.__call__(Py.newString(moduleName)); klass = module.__getattr__(className); System.err.println("module=" + module + ",class=" + klass); } // This constructor passes through to the other constructor public JythonObjectFactory(Class interfaceType, String moduleName, String className) { this(new PySystemState(), interfaceType, moduleName, className); } // All of the followng methods return // a coerced Jython object based upon the pieces of information // that were passed into the factory. The differences are // between them are the number of arguments that can be passed // in as arguents to the object. public Object createObject() { return klass.__call__().__tojava__(interfaceType); } public Object createObject(Object arg1) { return klass.__call__(Py.java2py(arg1)).__tojava__(interfaceType); } public Object createObject(Object arg1, Object arg2) { return klass.__call__(Py.java2py(arg1), Py.java2py(arg2)).__tojava__(interfaceType); } public Object createObject(Object arg1, Object arg2, Object arg3) { return klass.__call__(Py.java2py(arg1), Py.java2py(arg2), Py.java2py(arg3)).__tojava__(interfaceType); } public Object createObject(Object args[], String keywords[]) { PyObject convertedArgs[] = new PyObject[args.length]; for (int i = 0; i < args.length; i++) { convertedArgs[i] = Py.java2py(args[i]); } return klass.__call__(convertedArgs, keywords).__tojava__(interfaceType); } public Object createObject(Object... args) { return createObject(args, Py.NoKeywords); } } Main.java import org.jython.book.interfaces.BuildingType; import org.jython.book.util.JythonObjectFactory; public class Main{ 7. For more information about database design, refer to my other Apress book, Beginning Database Design: From Novice to Professional (Apress, 2007). vb.net code 39 reader C# . NET Code 39 Barcode Reader Control | Free C# Code to Scan ...
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NET Code 39 Barcode Reader , Reading Code - 39 barcode images in .NET, C#, VB . NET , ASP.NET applications. public static void main(String args[]) { JythonObjectFactory factory = new JythonObjectFactory( BuildingTypeclass, "building", "Building"); BuildingType building = (BuildingType) factorycreateObject(); buildingsetBuildingName("BUIDING-A"); buildingsetBuildingAddress("100 MAIN ST"); buildingsetBuildingId(1); Systemoutprintln(buildinggetBuildingId() + " " + buildinggetBuildingName() + " " + buildinggetBuildingAddress()); } } As you can see from the code, there are quite a few differences from the object factory implementation shown previously First, you can see that the instantiation of the object factory requires different arguments In this case, we pass in the interface, module, and class name Next, you can see that the PySystemState obtains a reference to the importer PyObject The importer then makes a __call__ to the module we ve requested The requested module must be contained somewhere on the syspath Lastly, we obtain a reference to our class by calling the __getattr__ method on the module. The application identifies four navigation areas: continent, country, area, and city. By passing these arguments to the script, the application can filter the content displayed on the index.php page. It determines which value(s) are passed and then extracts the filter from the $_GET array. If you test the page before populating the database content, you ll see something similar to the image shown in Figure 13-8. We can now use the returned class to perform the coercion of our Jython object into Java As mentioned previously, you ll note that this particular implementation includes several createObject() variations allowing one to pass arguments to the module when it is being called This, in effect, gives us the ability to pass arguments into the initializer of the Jython object Which object factory is best Your choice, depending upon the situation you re application is encountering Bottom line is that there are several ways to perform the object factory design and they all allow seamless use of Jython objects from within Java code Now that we have a coerced Jython object, we can go ahead and utilize the methods that have been defined in the Java interface As you can see, the simple example above sets a few values and then prints out the object values. table with Junior in the primary key, but Junor will not be accepted. In general, all 1-Many relationships between classes in a data model are set up this way. Listing 1-5 shows the SQL for creating the Member table with a foreign key constraint. vb.net code 39 reader Visual Studio . NET Barcode Scanner Library API for . NET Barcode ...
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