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Both these approaches are possible, yet both can be dangerous. The danger of adding new interfaces is that the user might find the interface difficult to use. It s particularly difficult to decide when to use the simple interface and when to use the enhanced version. Users can confuse the return types of methods and the types of fields. Enhancing an existing nonsubclassable class with a new method is nicer for clients, but it can be dangerous because of uncertain cooperation between the new and old methods. The participant needs to be careful to do this right. All the participants on Day 2 of the API Design Fest were able to satisfy the requirements and fulfilled all the given tasks. All the solutions qualified for the final round. You can look for various implementations of RealTest.java in the day2/alwayscreatenewcircuit, day2/ inputandoperation, day2/elementbasedsolution, day2/subclassingsolution, day2/ pinbasedsolution, day2/stackbasedsolution, and day2/welltestedsolution projects for the actual code. For purposes of this book, I ve chosen just one. This is the code provided by day2/welltestedsolution: public class RealTest extends TestCase { static { // your code shall run without any permissions } public RealTest(String testName) { super(testName); } protected void setUp() throws Exception { } protected void tearDown() throws Exception { }

def __unicode__(self): return "%s rating %s (%s)" % (selfuser, selfsnippet, selfget_rating_display()) def save(self): if not selfid: selfdate = datetimedatetimenow() super(Rating, self)save() As with the Bookmark model, you re setting related_name explicitly on the relationship to the User model in order to avoid any potential name clashes with other applications that might define rating systems The rating value, meanwhile, uses an integer field, with appropriately named constants, to handle the actual up and down rating values, in much the same fashion as the status field on the weblog s Entry model There is one new item, though: in the __unicode__() method, you re calling a method named get_rating_display().

Semiconductor and Mechanical Switches ........................................................................................... 389 Reed Relays..................................................................................................................................... 389 Relays .............................................................................................................................................. 390 Bipolar Transistors .......................................................................................................................... 391 Transistor Arrays ............................................................................................................................. 392 FETs................................................................................................................................................. 392 Optocouplers ................................................................................................................................... 393 Solid State Relays............................................................................................................................ 393

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/** First of all create a circuit that will evaluate * expression (X1 and X2) or not(x1). Hold the circuit * in some variable. * * Feed this circuit with x1=true, x2=false, assert result is false * * Feed the same circuit with x1=false, x2=true, assert result is * true * * Feed the same circuit with x1=0.0, x2=1.0, assert result is 1.0 * * Feed the same circuit with x1=0.5, x2=0.5, assert result is 0.625 * * Feed the same circuit with x1=0.0, x2=2.0 * , make sure it throws an exception */

Digital Input/Output Expansion ......................................................................................393

public void testX1andX2orNotX1() { Circuit c = Circuit.createOrCircuit( Circuit.createAndCircuit(Circuit.input(0), Circuit.input(1)), Circuit.createNotCircuit(Circuit.input(0)) ); assertFalse("true, false", c.evaluate(true, false)); assertTrue("false, true", c.evaluate(false, true)); assertEquals("0.0, 1.0", 1.0, c.evaluateFuzzy(0.0, 1.0), 0.0); } /** Ensure that one variable cannot be filled with two different * values. Create a circuit for x1 and x1. Make sure that for any * usage of your API that would not lead to an x1 * x1 result, an * exception is thrown. For example, if there was a way to feed the * circuit with two different values 0.3 and 0.5, an exception is * thrown indicating that this is an improper use of the circuit. */ public void testImproperUseOfTheCircuit() { // does not apply Circuit x1 = Circuit.input(0); Circuit c = Circuit.createOrCircuit(x1, x1); assertTrue("x1 or x1", c.evaluate(true)); assertFalse("x1 or x1", c.evaluate(false)); try { c.evaluate(); fail("x1 or x1 with wrong params"); } catch (IllegalArgumentException iea) { //expected } // the same with two instances of pin c = Circuit.createOrCircuit(Circuit.input(0), Circuit.input(0)); assertTrue("x1 or x1", c.evaluate(true)); assertTrue("x1 or x1", c.evaluate(true, false)); assertTrue("x1 or x1", c.evaluate(true, true)); assertFalse("x1 or x1", c.evaluate(false)); try { c.evaluate(); fail("x1 or x1 with wrong params"); } catch (IllegalArgumentException iea) { //expected } }

Shift Registers As Outputs.................................................................................................................... 393 Shift Registers As Inputs ...................................................................................................................... 395

Any time a model has a field with choices like this, a method whose name is derived from the name of the field will be automatically added by Django, which will return the human-readable value for the currently selected value While you re in the cab/modelspy file, you can also add a method to the Snippet model that calculates a snippet s total score by summing all of the ratings attached to it If you ve had much experience with SQL-based databases, your first instinct will probably be to look for a way to run a SELECT SUM(rating) query against the ratings table From a database perspective, that s certainly the obvious way to do it.

/** Write your own element type called "gte" that * will have two inputs and one output. * The output value will be 1 if x1 >= x2 and 0 otherwise. * * Create a * circuit for the following expression: (x1 and not(x1)) gte x1 * * Feed the circuit with 0.5 and verify the result is 0 * * Feed the same circuit with 1 and verify the result is 0 * * Feed the same circuit with 0 and verify the result is 1 */ public void testGreaterThanEqualElement() { Circuit gte = new Gte(Circuit.createAndCircuit( Circuit.input(0), Circuit.createNotCircuit(Circuit.input(0))), Circuit.input(0) ); assertEquals("0.5", 0.0, gte.evaluateFuzzy(0.5), 0.0); assertEquals("1.0", 0.0, gte.evaluateFuzzy(1.0), 0.0); assertEquals("0.0", 1.0, gte.evaluateFuzzy(0.0), 0.0); } public void testSilly() { // (x1 and not x2) or x3 Circuit c = Circuit.createOrCircuit( Circuit.createAndCircuit( null, Circuit.createNotCircuit(null)), null ); assertEquals("1 1 1", 1.0, c.evaluateFuzzy(1.0, assertEquals("1 1 0", 0.0, c.evaluateFuzzy(1.0, assertEquals("1 0 1", 1.0, c.evaluateFuzzy(1.0, assertEquals("1 0 0", 1.0, c.evaluateFuzzy(1.0, assertEquals("0 1 1", 1.0, c.evaluateFuzzy(0.0, assertEquals("0 1 0", 0.0, c.evaluateFuzzy(0.0, assertEquals("0 0 1", 1.0, c.evaluateFuzzy(0.0, assertEquals("0 0 0", 0.0, c.evaluateFuzzy(0.0, } }

Input Conditioning..........................................................................................................396

1.0, 1.0, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0,

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