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- This page generated: <strong>June 8 2004</strong></td></tr></tbody></table><table border="0" width="100%" cellspacing="0" cellpadding="5"><tr><td><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">4.3.13. Misc</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="sorting.html">Prev</a> </td><th width="60%" align="center">4.3. Printer</th><td width="20%" align="right"> <a accesskey="n" href="inspector.html">Next</a></td></tr></table><hr></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="misc"></a>4.3.13. Misc</h3></div></div><div></div></div><p>
-Lets you control miscellaneous settings that doesn't fit elsewhere.
-</p><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="misc-misc"></a>4.3.13.1. Misc</h4></div></div><div></div></div><div class="itemizedlist"><ul type="disc"><li><p><a name="paren-add"></a>
-Insert expression parentheses
-</p><a class="indexterm" name="d0e4907"></a><a class="indexterm" name="d0e4912"></a><p>
-It is always good advise to use more parentheses than you think you need. They
-may not be needed, but they add clarity and don't cost anything.
-</p><div class="example"><a name="ex-misc-expr"></a><p class="title"><b>Example 4.150. How is this expression evaluated?</b></p><table border="0" bgcolor="#E0E0E0" class="shade"><tr><td><pre class="programlisting">
-int result = 12 + 4 % 3 * 7 / 8;
-</pre></td></tr></table></div><p></p><div class="example"><a name="ex-misc-expr-continued"></a><p class="title"><b>Example 4.151. How is this expression evaluated? (continued)</b></p><table border="0" bgcolor="#E0E0E0" class="shade"><tr><td><pre class="programlisting">
-int result = 12 + ((4 % 3 * 7) / 8);
-</pre></td></tr></table></div><p></p></li><li><p><a name="misc-insert-uid"></a>
-Insert serial version UID
-</p><a class="indexterm" name="d0e4932"></a><p>
-Common sense dictates to declare an explicit serial version UID in every
-serializable class to eliminate the serial version UID as a potential source
-of incompatibility (with the additional benefit of a small performance gain).
-If this switch is enabled and the class directly dereives from either
-<tt class="filename">java.io.Serializable</tt> or <tt class="filename">java.io.Externalizable</tt>,
-Jalopy computes and inserts a serial version UID for the class.
-</p><p>
-For this feature to work, the class that has its serial version UID computed
-needs to be available on the classpath.
-</p></li><li><p><a name="misc-logging-conditional"></a>
-Insert logging conditional
-</p><p>
-Typically, logging systems have a method that submits a logging message like
-
-</p><table border="0" bgcolor="#E0E0E0" class="shade"><tr><td><pre class="screen">
-logger.debug("some message: " + someVar);
-</pre></td></tr></table><p>
-</p><p>
-This is fine, but if the debug level is set such that this message will
-<span class="emphasis"><em>NOT</em></span> display, then time is wasted doing the string marshalling.
-</p><p>
-Thus, the preferred way to do this is
-
-</p><table border="0" bgcolor="#E0E0E0" class="shade"><tr><td><pre class="screen">
-if (logger.isDebugEnabled()) {
- logger.debug("some message: " + someVar);
-}
-</pre></td></tr></table><p>
-
-which will only use CPU time if the log message is needed. Enabling this switch
-will ensure that every logging call with the debug level set will be enclosed with
-the conditional expression.
-</p><p>
-Use this feature with care! The current implementation only supports the Jakarta
-Log4J toolkit and is somewhat weak in that every method call called
-<i class="firstterm">debug</i> is treated as a logging call which could be incorrect
-in your application. However, it works fine for the <i class="firstterm">l7dlog</i> calls.
-</p></li><li><p><a name="misc-trailing-newline"></a>
-Insert trailing newline
-</p><p>
-If enabled, Jalopy inserts an empty line at the end of every file. This may
-help to avoid problems with certain text formatters and processors.
-</p><p>
-Note that Jalopy always inserts at least one empty line after footers, so there
-is no real need (but it doesn't hurt) to check the mark in case footer insertion
-will be performed (see <a href="footer.html" title="4.3.11. Footer">Section 4.3.11, “Footer”</a>)
-</p></li><li><p><a name="misc-array-brackets"></a>
-Array brackets after identifiers
-</p><p>
-Lets you choose where the brackets of array types should be placed.
-</p><p>
-By default, Jalopy prints the square brackets right after the array type.
-</p><div class="example"><a name="ex-misc-array-brackets"></a><p class="title"><b>Example 4.152. Array brackets after type</b></p><table border="0" bgcolor="#E0E0E0" class="shade"><tr><td><pre class="programlisting">
-int[] a;
-</pre></td></tr></table></div><p>
-But C/C++ programmers may expect them to appear after the identifier.
-</p><div class="example"><a name="ex-misc-array-brackets-identifier"></a><p class="title"><b>Example 4.153. Array brackets after identifier</b></p><table border="0" bgcolor="#E0E0E0" class="shade"><tr><td><pre class="programlisting">
-int a[];
-</pre></td></tr></table></div><p></p></li><li><p>
-Force formatting
-</p><p>
-Jalopy can keep track of which files have been formatted previously.
-See <a href="misc.html#misc-history" title="4.3.13.2. History">Section 4.3.13.2, “History”</a> below. If History is enabled, Jalopy will
-exclude files that have a modification date coincident with the last formatting.
-However, you can override this history check to force a format. For example,
-you might need to update the copyright notice for the whole code base. Enabling
-this switch ensures that all source files are always be formatted. Note that
-this switch is only meaningful if the history feature is enabled.
-</p></li></ul></div></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="misc-history"></a>4.3.13.2. History</h4></div></div><div></div></div><a class="indexterm" name="d0e5010"></a><p>
-The history feature offers a way to optimize the speed at which Jalopy processes
-of a group of files repeatedly. Using history, Jalopy is able to track file
-modifications between successive invocations, and only format those source
-files which have actually changed, or which weren't processed previously.
-This can save a huge amount of execution time for a project that is formatted
-repeatedly over time. There are two methods for keeping history.
-</p><div class="itemizedlist"><ul type="disc"><li><p><a name="history-file"></a>
-Use history file
-</p><a class="indexterm" name="d0e5019"></a><a class="indexterm" name="d0e5024"></a><p>
-If you can't get along with a history header comment at the top of each source
-file, but would like historical optimization, the file-based approach may work
-for you. The history information of previous formatting will be saved in a file
-<tt class="filename">history.dat</tt> under the Jalopy settings directory.
-</p><p>
-Note that this file will grow over time, especially if one manages several big
-projects. So the history file could become quite huge. As all history entries
-are read into memory at startup, it could eat up quite a bit of memory space.
-Therefore a little history viewer is provided which enables you to selectively
-remove obsolete entries.
-</p><p>
-In order to effectively use formatting of a project with several developers it is
-nice to be able to only format files which have changed. There are three methods of
-working out if a file has changed provided in a drop down. Timestamp will use the
-modification time of the file, this does not work very well with source control
-and multiple developers. There are two standard checksums available. These
-work by taking a checksum of the file and comparing it to the one in the history file.
-If this checksum is different, the file is parsed and formatted in memory and a new
-checksum calculated. If the new checksum is different than the checksum for the
-unformatted file, it is written to disk. This stops files that have just been updated
-from source control from having being formatted (and timestamps updated).
-</p><p>
-Use the <span><b class="guibutton">View...</b></span> button to display the history viewer. You
-can selectively remove entries via the popup menu.
-</p></li><li><p><a name="history-comment"></a>
-Use history comments
-</p><a class="indexterm" name="d0e5044"></a><a class="indexterm" name="d0e5049"></a><a class="indexterm" name="d0e5054"></a><p>
-Jalopy will insert a small comment in the first line of every source file.
-The comment encodes the time a file was last formatted along with the package
-name of the file. This method is precise and relatively foolproof but does not work well
-with SCM tools.
-</p></li></ul></div></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="misc-backup"></a>4.3.13.3. Backup</h4></div></div><div></div></div><p>
-For security reasons Jalopy creates a backup copy of the currently
-processed file so it can be restored in case a severe error occured during the
-formatting process. The original file is stored in the backup directory and normally
-deleted after the newly formatted file has been successfully written.
-</p><div class="itemizedlist"><ul type="disc"><li><p>
-Level
-</p><p>
-The backup level defines how many numbered backups should be retained (up to 30).
-The default is to never hold any backups.
-</p></li><li><p>
-Directory
-</p><p>
-Specifies where file backups are stored. You should leave this setting untouched
-in order to make your code convention portable across different systems and platforms.
-</p></li></ul></div></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="misc-threads"></a>4.3.13.4. Threads</h4></div></div><div></div></div><p>
-Jalopy, more precisely the provided Plug-ins, are multi-threaded. On
-multi-processor systems the work can be divided onto several processors to
-speed up processing.
-</p><div class="itemizedlist"><ul type="disc"><li><p>
-Number
-</p><p>
-Specifies the number of processing threads to be used. This setting should be
-equal to the number of processors your system has.
-</p></li></ul></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sorting.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="printer.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="inspector.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">4.3.12. Sorting </td><td width="20%" align="center"><a accesskey="h" href="manual.html">Home</a></td><td width="40%" align="right" valign="top"> 4.4. Code Inspector</td></tr></table></div></td></tr></table></td></tr><tr><td bgcolor="#eeeecc" height="17" style="font-size:9px;padding-left:5px"><a href="#toppage">to top</a></td></tr><tr><td height="30"><br></td></tr><tr><td height="3"></td></tr><tr><td bgcolor="#336699" height="1"></td></tr><tr><td height="1"></td></tr><tr><td bgcolor="#336699" height="16"></td></tr><tr><td bgcolor="#ff9966" height="4"></td></tr><tr><td class="footer" align="center" height="15" valign="middle">
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