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debug( "Key transforms from [" + key + "] to [" + outputKey + "]"); } outputcollect(outputKey, value); return; } In Listing 9-7, the default case of a raw log line is handled This code does make the assumption that the keyValueSeparator computed in Listing 9-6, is correct A complete line is assembled in sb, and then parsed The IP address is assumed to be the first text in the line and to be terminated by an ASCII space character This code accepts only IPv4 addresses in the format of four dot-separated octets Once the correct key and new value are produced, they are output The use of chain mapping actually reduces the efficiency of the task, but it is nice to have a demonstration Listing 9-7 The Mapper Log Line Processing Part 2, ApacheLogTransformMapper.

Finally, Slick adds three more properties to the expression object: length, which indicates the number of selector groups in the expression, reverse, which is a function used to reverse the expression, and Slick, which is a simple flag that helps the parser to avoid reprocessing an expression object Because selector string parsing can be taxing on performance, Slick caches parsed selectors for later use If the same string selector is passed to Slick twice, Slick will simply return the expression object from its cache that was previously parsed This enables Slick to avoid recomputing selectors for each call to the Slickparse function..

Be very careful when coding the ExecuteAction() method if you try to run an action that isn t Tip possible (e.g., inserting an optional section that s already in the form or removing one that isn t there), then you will get various exceptions depending on the action. The key is to test the status of the control you intend to act on to ensure it s in an appropriate state for the action.

java /** For paranoia sake, reassemble the log line and split it ourselves * on the first space */ sbsetLength(0); sbappend(logLine); sbappend( keyValueSeparator); sbappend( valuetoString()); logLine = sbtoString(); int indexOfSpace = logLineindexOf(' '); if (indexOfSpace< 7 || indexOfSpace > 15) { /** xxxxxxxxxxxx = 15 chars, 1111 = 7 chars */.

Once a string CSS expression has been turned into a selector object, it is then turned over to the selection engine called SlickFinder It is up to this engine to parse the selector object and locate the node or nodes in question Both Slickfind and Slicksearch use a single internal function called search to perform the selection This function takes the context and expression arguments from the two functions, calls Slickparse to turn the string expression into an expression object, and uses this expression object to traverse the context to find the nodes being selected I mentioned in the previous section that the combinator properties from the expressions are important for Slick s functionality This is because Slick uses a combinatorial traversal mechanism, where the combinators of each expression are used to decide how to select the nodes being matched.

if (LOG.isDebugEnabled()) { LOG.debug("Log line does not start with an ip address [" + logLine + "]" ); } reporter.incrCounter("ApacheLogTransformMapper", "BAD LOG LINES", 1); return; } ipAddress = logLine.substring(0,indexOfSpace); logLine = logLine.substring(indexOfSpace+1); if (parseAddressIntoKey(ipAddress, outputKey, reporter)) { outputValue.set( logLine ); reporter.incrCounter("ApacheLogTransformMapper", "VALID LOG LINES", 1); if (LOG.isDebugEnabled()) { LOG.debug( "Key transforms from [" + key + "] to [" + outputKey + "]"); } output.collect( outputKey, outputValue ); return; } The KeyValidatingMapper, shown in Listing 9-8, just checks the keys for the proper shape that they are valid IPv4 addresses and swaps the search space begin and end range values if begin is greater than end. At this point, all keys are assumed to be valid, and this map verifies that. Several counters are kept to help with sort and long-term monitoring of the job. Listing 9-8. KeyValidatingMapper.java if (!helper.getFromRaw(key)) { reporter.incrCounter("KeyvalidatingMapper", "INVALID KEYS", 1); return; } if (helper.isSearchRequest()) { reporter.incrCounter("KeyValidatingMapper", "TOTAL SEARCH", 1); if (helper.getSearchRequest()<0 || helper.getSearchRequest()>4294967296L) { if (LOG.isDebugEnabled()) { LOG.debug("Search Key out of range [" + key + "]"); } reporter.incrCounter("KeyValidatingMapper", "SEARCH OUT OF RANGE", 1); return; } output.collect( key, value); return; } else { reporter.incrCounter("KeyValidatingMapper", "TOTAL SPACE", 1);

The ExecuteAction() method takes two arguments: ActionType: An enum type indicating what action to execute. For optional sections, you ll use either XOptionalInsert or XOptionalRemove. xmlToEdit: The control to act on. Note that there s a special control name you have to use for this argument the property tag is displayed on the Advanced tab of the control s properties dialog as the XmlToEdit for xOptional (see Figure 9-5).