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The failure will actually occur in the AuctionMessageTranslator (last shown in 14) which will throw a runtime exception when it tries to parse the message The Smack library drops exceptions thrown by MessageHandlers, so we have to make sure that our handler catches everything As we write a unit test for a failure in the translator, we realize that we need to report a new type of auction event, so we add an auctionFailed() method to the AuctionEventListener interface

boolean isPreTag = false;

At least one tool tip provides information that all users need At least one tool tip displays data that users can find only in tool tips--for example, numerical values represented by bars in a bar graph

@Test public void notifiesAuctionFailedWhenBadMessageReceived() { contextchecking(new Expectations() {{ exactly(1)of(listener)auctionFailed(); }}); Message message = new Message(); messagesetBody("a bad message"); translatorprocessMessage(UNUSED_CHAT, message); }

boolean isScriptTag = false;

StringBuffer results = new StringBuffer();

This fails with an ArrayIndexOutOfBoundsException when it tries to unpack a name/value pair from the string We could be precise about which exceptions to catch but in practice it doesn t really matter here: we either parse the message or we don t, so to make the test pass we extract the bulk of processMessage() into a translate() method and wrap a try/catch block around it

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I compile and test to confirm that the changes work 2 Now I apply Extract Method [F] on the first chunk of accumulation code for theStringNode type:

public class AuctionMessageTranslator implements MessageListener { public void processMessage(Chat chat, Message message) { try { translate(messagegetBody()); } catch (Exception parseException) { listenerauctionFailed(); } }

public class TextExtractor public String extractText() for (NodeIterator e = parserelements(); ehasMoreNodes();) { node = enextNode(); if (node instanceof StringNode) {

If neither statement is true, consider using the JFC's default values for the onset delay and duration of tool tips

accept(node);

While we re here, there s another failure mode we d like to check It s possible that a message is well-formed but incomplete: it might be missing one of its elds

} else if (

private void accept(Node node) { if (!isScriptTag) { StringNode stringNode = (StringNode) node; if (isPreTag) resultsappend(stringNodegetText()); else { String text = Translatedecode(stringNodegetText()); if (getReplaceNonBreakingSpace()) text = textreplace('\a0', ' '); if (getCollapse()) collapse(results, text);

19

This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks

One main characteristic of a well-designed user interface is consistency among its parts This characteristic helps users learn similar parts of the user interface faster You can help users learn your application's user interface faster by creating its similar parts from the same sets of JFC components--that is, by implementing the same patterns, or idioms This chapter explains what idioms are and then describes idioms for:

such as the event type or current price We write a couple of tests to con rm that we can catch these, for example:

else resultsappend(text); } } }

The accept() method currently type-casts its node argument to a StringNode I will be creatingaccept() methods for each of the accumulation sources, so I must customize this one to accept an argument of type StringNode:

@Test public void notifiesAuctionFailedWhenEventTypeMissing() { contextchecking(new Expectations() {{ exactly(1)of(listener)auctionFailed(); }}); Message message = new Message(); messagesetBody("SOLVersion: 11; CurrentPrice: 234; Increment: 5; Bidder: " + SNIPER_ID + ";"); translatorprocessMessage(UNUSED_CHAT, message); }

public class TextExtractor public String extractText() for (NodeIterator e = parserelements(); ehasMoreNodes();) { node = enextNode(); if (node instanceof StringNode) { accept(

Our x is to throw an exception whenever we try to get a value that has not been set, and we de ne MissingValueException for this purpose

(StringNode)node);

Selecting and editing in tables provided by your application Arranging such tables Combining a tree component with a table Working with text fields and lists

} else if ( private void accept(

public static class AuctionEvent { [ ] private String get(String name) throws MissingValueException { String value = valuesget(name); if (null == value) { throw new MissingValueException(name); } return value; } }

StringNode stringNode)

if (!isScriptTag) {

Of course we don t tell everything;1 we ask when getting information from values and collections, or when using a factory to create new objects Occasionally, we also ask objects about their state when searching or ltering, but we still want to maintain expressiveness and avoid train wrecks For example (to continue with the metaphor), if we naively wanted to spread reserved seats out across the whole of a train, we might start with something like:

StringNode stringNode = (StringNode) node;

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