Using Pipelines to Format the Output

The output of ckjm is textual: one line for each class, each line contains 8 space-separated fields: the classname and the 7 metrics. If your application requires something more fancy, it is easy to post-process the ckjm output to obtain it. For example, the following sed script will generate XML output.

#!/bin/sed -f
1i\
<?xml version="1.0" ?>\
<ckjm>
s/^/<metric><classname>/
s/ /<\/classname><WMC>/
s/ /<\/WMC><DIT>/
s/ /<\/DIT><NOC>/
s/ /<\/NOC><CBO>/
s/ /<\/CBO><RFC>/
s/ /<\/RFC><LCOM>/
s/ /<\/LCOM><Ca>/
s/ /<\/Ca><NPM>/
s/$/<\/NPM><\/metric>/
$a\
</ckjm>

If you name the script ckjm2xml and make it executable, you can generate XML output and save it into a file as follows.

java -jar /usr/local/lib/ckjm.jar *.class | ckjm2xml >metrics.xml

(Replace the sequence /usr/local/lib/ckjm.jar with the actual path and filename of the ckjm version you are using.)
Here is an example of the output.

<?xml version="1.0" ?>
<ckjm>
<metric><classname>gr.spinellis.ckjm.ClassMetricsContainer</classname><WMC>3</WMC><DIT>1</DIT><NOC>0</NOC><CBO>3</CBO><RFC>18</RFC><LCOM>0</LCOM><Ca>2</Ca><NPM>2</NPM></metric>
<metric><classname>gr.spinellis.ckjm.MethodVisitor</classname><WMC>11</WMC><DIT>1</DIT><NOC>0</NOC><CBO>21</CBO><RFC>40</RFC><LCOM>0</LCOM><Ca>1</Ca><NPM>8</NPM></metric>
<metric><classname>gr.spinellis.ckjm.CkjmOutputHandler</classname><WMC>1</WMC><DIT>1</DIT><NOC>0</NOC><CBO>1</CBO><RFC>1</RFC><LCOM>0</LCOM><Ca>3</Ca><NPM>1</NPM></metric>
<metric><classname>gr.spinellis.ckjm.ClassMetrics</classname><WMC>24</WMC><DIT>1</DIT><NOC>0</NOC><CBO>0</CBO><RFC>33</RFC><LCOM>196</LCOM><Ca>6</Ca><NPM>23</NPM></metric>
<metric><classname>gr.spinellis.ckjm.MetricsFilter</classname><WMC>7</WMC><DIT>1</DIT><NOC>0</NOC><CBO>6</CBO><RFC>30</RFC><LCOM>11</LCOM><Ca>2</Ca><NPM>5</NPM></metric>
<metric><classname>gr.spinellis.ckjm.ClassVisitor</classname><WMC>13</WMC><DIT>1</DIT><NOC>0</NOC><CBO>14</CBO><RFC>71</RFC><LCOM>34</LCOM><Ca>2</Ca><NPM>9</NPM></metric>
<metric><classname>gr.spinellis.ckjm.ClassMap</classname><WMC>3</WMC><DIT>1</DIT><NOC>0</NOC><CBO>1</CBO><RFC>21</RFC><LCOM>0</LCOM><Ca>0</Ca><NPM>2</NPM></metric>
<metric><classname>gr.spinellis.ckjm.PrintPlainResults</classname><WMC>2</WMC><DIT>1</DIT><NOC>0</NOC><CBO>2</CBO><RFC>8</RFC><LCOM>0</LCOM><Ca>1</Ca><NPM>2</NPM></metric>
</ckjm>

To copy the ckjm's output to the Microsoft Windows clipboard to later paste the results into an MS-Word table, simply pipe the output of ckjm to the winclip command of the Outwit tool suite.

You can also plot the results in various formats by using gnuplot. Here is a diagram depicting the distribution of the CBO metric within the classes of Eclipse.

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