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Even if you re using a formatting tool either at build time or with your favorite IDE, there are still style checks beyond the realm of formatting. Checkstyle is a tool that enables code to be checked against a convention. Checkstyle supports the Sun convention by default, although it can check for more than just simple formatting. For example, it can check for illegal regular expressions in the code, inline conditionals, double-checked locking, and other idioms or patterns that might be considered unsafe or problematic. You can download Checkstyle from http://checkstyle.sourceforge.net. At the root of the Checkstyle distribution you ll find the checkstyle-all-4.0.jar file. Place this file in a directory named checkstyle under the lib directory of the TechConf project directory. The file containing the XML configuration representing the Sun convention is named sun_checks.xml, and it s located under the docs directory of the distribution directory. Copy this file to the lib/checkstyle directory also. Checkstyle writes its output to the standard out by default or to a file in plain text or XML format. The Checkstyle distribution also provides several Extensible Stylesheet Language (XSL) stylesheets that can be used to convert the XML reports to HTML format for easier viewing. You can find these stylesheets in the Checkstyle distribution under the contrib directory. Copy the checkstyle-noframes-sorted.xsl file to the lib/checkstyle directory. To use Checkstyle from within Ant, you first need to load the checkstyle task. As with the Javadoc task we will incorporate the checkstyle task in a macrodef contained in the macros.xml file. First we need to make the checkstyle task available to the macros.xml file by defining a taskdef for it: <path id="checkstyle.class.path"> <fileset dir="lib/checkstyle"> <include name="*.jar"/> </fileset> </path>

get_code_id_descr()

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If an application is written for a high volume of data entry, the GUI in question will present a field for the entry of a code value and a second field to display the specified code s description value. The users may also have an icon they can click to see a pop-up list of code values from which to select. The typical end-user action in this design is for the end user to specify all or part of a code value, and then to tab into the next modifiable field, at which point, the presentation layer validates the user s code value entry. That s what this method is for: validation. In order to validate a code value, simply pass the code value to PROCEDURE get_code_id_descr(aiov_code, aon_id, aov_description, aid_on). This procedure first tries to find an exact code value match for the specified point in time. If it does not find a match, the

Now you ve learned about gathering up parameters in tuples and dictionaries, but it is in fact possible to do the opposite as well, with the same two operators, * and **. What might the opposite of parameter gathering be Let s say we have the following function available: def add(x, y): return x + y

Listing 8-8. TestC TestNG Class package package3; import org.testng.annotations.Test; public class TestC { @Test(groups = {"GroupY"}) public void testC1() { System.out.println("testC1"); assert true; } @Test(groups = {"GroupX","GroupZ"}) public void testC2() { System.out.println("testC2"); assert true; } } Finally, the class TestC belongs to package3 and contains the test methods testC1 and testC2. The method testC1 belongs to the test group GroupY, and testC2 belongs to both GroupX and GroupZ. If we wanted, for example, to run all tests belonging to GroupX, we could use a testng.xml file like that shown in Listing 8-9. Listing 8-9. TestNG Configuration for Running Tests in GroupX <!DOCTYPE suite SYSTEM "http://beust.com/testng/testng-1.0.dtd" > <suite name="Some Tests" verbose="1"> <test name="Group Test"> <groups> <run> <include name="GroupX"/> </run> </groups> <classes> <class name="package1.TestA"/> <class name="package2.TestB"/> <class name="package3.TestC"/> </classes> </test> </suite> The testng.xml file also specified the classes to be included in the test. Running the test will produce output similar to:

procedure tries to find a single LIKE match. If it does not find a single LIKE match, it may return a NO_DATA_FOUND or TOO_MANY_ROWS exception, which the presentation layer will need to handle. Both exceptions mean that the user has specified an invalid code value. Here s an example from code table package WORKER_TYPE_TS: PROCEDURE get_code_id_descr( aiov_code aon_worker_type_id aov_description aid_on v_code

WORKER_TYPE_T.code%TYPE, WORKER_TYPE_T.worker_type_id%TYPE, WORKER_TYPE_T.description%TYPE, WORKER_TYPE_T.active_date%TYPE ) is WORKER_TYPE_T.code%TYPE;

Also, let s say you have a tuple with two numbers that you want to add: params = (1, 2) This is more or less the opposite of what we did previously. Instead of gathering the parameters, we want to distribute them. This is simply done by using the asterisk operator in the other end, that is, when calling the function rather than when defining it: >>> add(*params) 3 This works with parts of a parameter list, too, as long as the expanded part is last. You can use the same technique with dictionaries, using the double asterisk operator. Assuming that you have defined hello_3 as before, you can do the following: >>> params = {'name': 'Sir Robin', 'greeting': 'Well met'} >>> hello_3(**params) Well met, Sir Robin! Using the asterisk (or double asterisk) both when you define and call the function will simply pass the tuple or dictionary right through, so you might as well not have bothered: >>> def with_stars(**kwds): print kwds['name'], 'is', kwds['age'], 'years old' >>> def without_stars(kwds): print kwds['name'], 'is', kwds['age'], 'years old' >>> >>> Mr. >>> Mr. args = {'name': 'Mr. Gumby', 'age': 42} with_stars(**args) Gumby is 42 years old without_stars(args) Gumby is 42 years old