Benefits and Liabilities in Java

Maker Data Matrix ECC200 in Java Benefits and Liabilities
Benefits and Liabilities
Drawing Data Matrix 2d Barcode In Java
Using Barcode maker for Java Control to generate, create Data Matrix ECC200 image in Java applications.
+ + + Removes duplicate code associated with handling one or many objects Provides a uniform way to process one or many objects Supports richer ways to process many objects (eg, an OR expression) May require runtime checks for type safety during construction of the Composite
Bar Code Drawer In Java
Using Barcode creation for Java Control to generate, create bar code image in Java applications.
Mechanics
Scanning Bar Code In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
In this section and the Example section, a method that works with one object is called a one-object method while a method that works with a collection of objects is called a many-object method 1 The many-object method accepts a collection as a parameter Create a new class that accepts the collection in a constructor and provides a getter method for it This composite class will become what is known as a Composite in Design Patterns [DP] Within the many-object method, declare and instantiate an instance of your composite (ie, the new class) In addition, find all references within the many-object method to the collection and update the code so access to the collection is obtained via the composite's getter method
Drawing Data Matrix 2d Barcode In Visual C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create Data Matrix image in Visual Studio .NET applications.
This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks
Painting Data Matrix 2d Barcode In VS .NET
Using Barcode maker for ASP.NET Control to generate, create Data Matrix image in ASP.NET applications.
Compile and test 2 Apply Extract Method [F] on the code within the many-object method that works with the collection Make the extracted method public Then apply Move Method [F] on the extracted method to move it to your composite Compile and test 3 The many-object method will now be nearly identical to the one-object method The main difference is that the many-object method instantiates your composite If there are other differences, refactor to eliminate them Compile and test 4 Change the many-object method so it contains one line of code: a call to the one-object method that passes it your composite instance as an argument You'll need to make the composite share the same interface or superclass as the type used by the one-object method To do this, consider making the composite a subclass of the type used by the one-object method or create a new interface (using Extract Interface [F]) that the composite and all objects passed to the one-object method implement Compile and test 5 Because the many-object method now consists of just one line of code, it can be inlined by applying Inline Method [F] Compile and test 6 Apply Encapsulate Collection [F] on your composite This will produce anadd( ) method on the composite, which clients will call instead of passing a collection to the composite's constructor In addition, the getter method for the collection will now return an unmodifiable collection Compile and test
Data Matrix Encoder In .NET
Using Barcode creation for VS .NET Control to generate, create DataMatrix image in .NET applications.
Example
Data Matrix ECC200 Creator In Visual Basic .NET
Using Barcode maker for VS .NET Control to generate, create Data Matrix 2d barcode image in .NET applications.
This example deals with Spec instances and how they are used to obtain a desired set ofProduct instances from a ProductRepository The example also illustrates the Specification pattern [Evans] as described in Replace Implicit Language with Interpreter (269) Let's begin by studying some test code for the ProductRepository Before any test can run, aProductRepository (called repository) must be created For the test code, I fill a repository with toy Product instances: public class ProductRepositoryTest extends TestCase private ProductRepository repository; private Product fireTruck = new Product("f1234", "Fire Truck", Colorred, 895f, ProductSizeMEDIUM); private Product barbieClassic = new Product("b7654", "Barbie Classic", Coloryellow, 1595f, ProductSizeSMALL); private Product frisbee = new Product("f4321", "Frisbee", Colorpink, 999f, ProductSizeLARGE); private Product baseball = new Product("b2343", "Baseball", Colorwhite, 895f, ProductSizeNOT_APPLICABLE); private Product toyConvertible =
Print ECC200 In Java
Using Barcode creator for Java Control to generate, create ECC200 image in Java applications.
This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks
Generating Code 128 In Java
Using Barcode printer for Java Control to generate, create Code 128 Code Set B image in Java applications.
new Product("p1112", "Toy Porsche Convertible", Colorred, 23000f, ProductSizeNOT_APPLICABLE); protected void setUp() { repository = new ProductRepository(); repositoryadd(fireTruck); repositoryadd(barbieClassic); repositoryadd(frisbee); repositoryadd(baseball); repositoryadd(toyConvertible); }
EAN / UCC - 13 Creation In Java
Using Barcode encoder for Java Control to generate, create EAN / UCC - 13 image in Java applications.
The first test we'll study looks for Product instances of a certain color by means of a call torepositoryselectBy( ): public class ProductRepositoryTest extends TestCase public void testFindByColor() { List foundProducts = repositoryselectBy(new ColorSpec(Colorred)); assertEquals("found 2 red products", 2, foundProductssize()); assertTrue("found fireTruck", foundProductscontains(fireTruck)); assertTrue( "found Toy Porsche Convertible", foundProductscontains(toyConvertible)); }
Drawing Barcode In Java
Using Barcode generator for Java Control to generate, create barcode image in Java applications.
The repositoryselectBy( ) method looks like this: public class ProductRepository private List products = new ArrayList(); public Iterator iterator() { return productsiterator(); } public List selectBy(Spec spec) { List foundProducts = new ArrayList(); Iterator products = iterator(); while (productshasNext()) { Product product = (Product)productsnext(); if (specisSatisfiedBy(product)) foundProductsadd(product); } return foundProducts; }
Printing Barcode In Java
Using Barcode maker for Java Control to generate, create barcode image in Java applications.
Let's now look at another test, which calls a different repositoryselectBy( ) method This test assembles a List of Spec instances in order to select specific kinds of products from the repository: public class ProductRepositoryTest extends TestCase public void testFindByColorSizeAndBelowPrice() { List specs = new ArrayList(); specsadd(new ColorSpec(Colorred)); specsadd(new SizeSpec(ProductSizeSMALL)); specsadd(new BelowPriceSpec(1000)); List foundProducts = repositoryselectBy(specs); assertEquals(
USPS Confirm Service Barcode Maker In Java
Using Barcode drawer for Java Control to generate, create USPS Confirm Service Barcode image in Java applications.
This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks
Bar Code Recognizer In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
"small red products below $1000", 0, foundProductssize()); }
Code 128C Generation In C#
Using Barcode encoder for .NET framework Control to generate, create Code-128 image in .NET applications.
The List-based repositoryselectBy( ) method looks like this: public class ProductRepository { public List selectBy(List specs) { List foundProducts = new ArrayList(); Iterator products = iterator(); while (productshasNext()) { Product product = (Product)productsnext(); Iterator specifications = specsiterator(); boolean satisfiesAllSpecs = true; while (specificationshasNext()) { Spec productSpec = ((Spec)specificationsnext()); satisfiesAllSpecs &= productSpecisSatisfiedBy(product); } if (satisfiesAllSpecs) foundProductsadd(product); } return foundProducts; }
Create Bar Code In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create bar code image in ASP.NET applications.
As you can see, the List-based selectBy( ) method is more complicated than the oneSpec selectBy( ) method If you compare the two methods, you'll notice a good deal of duplicate code A Composite can help remove this duplication; however, there's another way to remove the duplication that doesn't involve a Composite Consider this: public class ProductRepository public List selectBy(Spec spec) {
Barcode Creation In C#
Using Barcode generator for .NET Control to generate, create bar code image in VS .NET applications.
Spec[] specs = { spec }; return selectBy(ArraysasList(specs));
Bar Code Generation In Visual Studio .NET
Using Barcode maker for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
} public List selectBy(List specs)
Code 128C Creator In .NET Framework
Using Barcode creation for .NET framework Control to generate, create Code 128 Code Set A image in .NET applications.
Make Code 128C In Visual Basic .NET
Using Barcode printer for VS .NET Control to generate, create Code 128 Code Set A image in Visual Studio .NET applications.