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Java 2 Platform, Micro Edition (henceforth referred to as Java 2 Micro Edition or J2ME) specifically addresses the large, rapidly growing consumer space, which covers a range of devices from tiny commodities, such as pagers, all the way up to the TV set-top box, an appliance almost as powerful as a desktop computer Like the larger Java editions, Java 2 Micro Edition aims to maintain the qualities that Java technology has become known for, including built-in consistency across products, portability of code, safe network delivery, and upward scalability

if state != _OKAY: self__fhtruncate(0) else: limit = None for index in range(len(self) - 1, 0, -1): self__seek_to_index(index) state = self__fhread(1) if state != _OKAY: limit = index else: break if limit is not None: self__fhtruncate(limit * self__record_size) self__fhflush()

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If the rst record is blank or deleted, then they must all be blank or deleted since the previous code moved all nonblank nondeleted records to the beginning of the le and blank and deleted ones to the end In this case we can simply truncate the le to 0 bytes If there is at least one nonblank nondeleted record we iterate from the last record backward toward the rst since we know that blank and deleted records have been moved to the end The limit variable is set to the earliest blank or deleted record (or left as None if there are no blank or deleted records), and the le is truncated accordingly An alternative to doing the compacting in-place is to do it by copying to another le this is useful if we want to make a backup, as the compact() method that we will review next shows

def compact(self, keep_backup=False): compactfile = self__fhname + "$$$" backupfile = self__fhname + "bak" self__fhflush() self__fhseek(0) fh = open(compactfile, "wb") while True: data = self__fhread(self__record_size) if not data: break if data[:1] == _OKAY: fhwrite(data) fhclose() self__fhclose() osrename(self__fhname, backupfile) osrename(compactfile, self__fhname)

Support for reference preservation needs to be implemented in code if you plan to use custom serialization using the interface

if not keep_backup: osremove(backupfile) self__fh = open(self__fhname, "r+b")

The high-level idea behind J2ME is to provide comprehensive application development platforms for creating dynamically extensible, networked devices and applications for the consumer and embedded market J2ME enables device manufacturers, service providers, and content creators to capitalize on new market opportunities by developing and deploying compelling new applications and services to their customers worldwide Furthermore, J2ME allows device manufacturers to open up their devices for widespread third-party application development and dynamically downloaded content without losing the security or the control of the underlying manufacturer-specific platform

This method creates two les, a compacted le and a backup copy of the original le The compacted le starts out with the same name as the original but with $$$ tacked on to the end of the lename, and similarly the backup le has the original lename with bak tacked on to the end We read the existing le record by record, and for those records that are nonblank and nondeleted we write them to the compacted le (Notice that we write the real record, that is, the state byte plus the user record, each time)

The line if data[:1] == _OKAY: is quite subtle Both the data object and the _OKAY object are of type bytes We want to compare the rst byte of the data object to the (1 byte) _OKAY object If we take a slice of a bytes object, we get a bytes object, but if we take a single byte, say, data[0], we get an int the byte s value So here we compare the 1 byte slice of data (its rst byte, the state byte) with the 1 byte _OKAY object (Another way of doing it would be to write if data[0] == _OKAY[0]: which would compare the two int values) At the end we rename the original le as the backup and rename the compacted le as the original We then remove the backup if keep_backup is False (the default) Finally, we open the compacted le (which now has the original lename), ready to be read or written The BinaryRecordFileBinaryRecordFile class is quite low-level, but it can serve as the basis of higher-level classes that need random access to les of xed-size records, as we will see in the next subsection

Let s look at an example in Listing 614 First, a list is created from Then several objects are added to the list

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