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Listing 9-3. boolean TextKeyHelperWithSeparators.getFromRaw(Text raw) public boolean getFromRaw(Text raw) { isValid = false; hasEndRange = false; String rawText = raw.toString(); if (rawText.length()==(addressLen+1) && rawText.charAt(addressLen)==searchRequestSuffix) { String searchRequest = rawText.substring(0, addressLen); beginRangeOrKey = Long.valueOf(searchRequest,16); } else if (rawText.length()==(addressLen*2+1) && rawText.charAt(addressLen)==rangeSeparator) { String beginRange = rawText.substring( 0, addressLen); beginRangeOrKey = Long.valueOf(beginRange,16); endRange = Long.valueOf(rawText.substring(addressLen+1,addressLen*2+1),16); /** Verify that the begin range is less or equal to the end */ if (beginRangeOrKey>endRange) { if (LOG.isDebugEnabled()) { LOG.debug("key [" + rawText + "] length " + rawText.length() + " begin > end " + beginRangeOrKey + " " + endRange); } return false; } hasEndRange = true; } else { if (LOG.isDebugEnabled()) { LOG.debug("key [" + rawText + "] length " + rawText.length() + " invalid"); } /** length is wrong, or the separator or suffix is wrong. */ return false; } isValid = true; return true; } In Listing 9-3, the key is converted to a String and examined to see if it is one of the two patterns that are accepted. All IP addresses will be encoded as eight hexadecimal digits. If the key is a search request, there will be one IP address and a trailing searchRequestSuffix character only, forcing the string to be only nine characters in length. If the key is a search space item, there will be two IP addresses, with a rangeSeparator character between them only, forcing the string to be seventeen characters in length. The IP addresses are converted into long values via Long.valueOf(address,16). The String.substring method is used for extracting the actual IP address data from the raw string.

Slick supports all of the common pseudo-selectors we ve seen so far, together with a few additional ones: :enabled matches a node if its disabled property is false. :disabled matches a node if its disabled property is true. :checked matches a checkbox if it s currently checked. :focus matches a node if it currently has user focus. :selected matches a form element if it s currently selected.

If a valid search request or search space definition is found, the helper object is marked valid, isValid = true, and beginRangeOrKey is set to the first IP address found. If the key contained a search space request, hasEndRange is set to true and endRange is set to the second IP address. The setToRaw method, in Listing 9-4, is used to create and store a value in a key object that correctly encodes either a search request or a search space. If the helper object is not valid, nothing is done, and no indication of this is made. This will open the door to missing errors. Changing this behavior requires rearchitecting the application to provide a visible trace of this error; logging it is not likely to be sufficient. A StringBuilder and Formatter are ThreadLocal instance variables, making this class thread-safe. This is done as a small efficiency and a protection against the day when the helper is used in a multithreaded map task. Listing 9-4. void TextKeyHelperWithSeparators.setToRaw(Text raw) public void setToRaw(Text raw) { if (!isValid) { return; } Formatter fmt = keyFormatter.get(); fmt.flush(); StringBuilder sb = keyBuilder.get(); sb.setLength(0); if(hasEndRange) { fmt.format( "%08x%c%08x", beginRangeOrKey, rangeSeparator, endRange ); } else { fmt.format( "%08x%c", beginRangeOrKey, searchRequestSuffix); } fmt.flush(); raw.set(sb.toString()); }

Figure 2-12. Master/detail controls with different record selected in the master Bulleted list, numbered list, and plain list: These offer various ways of simply listing data bound to repeating nodes (see Figure 2-13). With any of the repeating lists, the user simply has to type information, and then press the Enter key to add another item. Tabbing takes the user out of the list to the next control.

Note It is reasonable to assume that anything written to the log by a task will never have been seen by a

The interesting thing about pseudo-selectors in Slick is that they re actually implemented as functions. We can think of pseudo-selectors as conditional functions that are applied to nodes in order to test whether they pass a certain condition. For example, the :enabled pseudo-selector function is actually implemented like so: function (node){ return node.disabled === false; } This function can then be used to test the nodes during the selection process. For instance, when we pass the selector expression input:enabled to Slick, it first selects all input elements in the context, then

With the plan for the comparator handled, it is time to design the mapper. This mapper must handle two tasks: For the search requests, the mapper must accept Apache log files and extract a key from the line in the key format, passing the rest of the line as the value. The search space items will be stored as straight text, with a tab (\t) separating the range from the data. The mapper may distinguish between the two records either from the input file name or by the length of the key.