java business rule tool

[Uwe Geercken]

hello all together,

I have created a business rule engine already some month ago, but I  
haven't had a lot of feedback so far. anyway, I thought that one or  
the other of you might be interested. excuse me if you feel it is a  
little bit off-topic.

the basic idea is, to have e.g. a text file (or database) with some  
records and to define some test/checks in an xml format and then check  
the rules against the file. you can put multiple rules together to  
form groups and subgroups.

the program is written in java and comes with an example script and  
data and documentation. so if you have java on your machine, you can  
download the package, extract the files and run the sample.

here is an example of the data (airports):

KABE;LEHIGH VALLEY INTL;00393;N40390750;W075262690
KABI;ABILENE RGNL;01791;N32244075;W099405483
KABR;ABERDEEN RGNL;01302;N45265660;W098251860
KABY;SOUTHWEST GEORGIA RGNL;00197;N31320785;W084114010
KACK;NANTUCKET MEM;00048;N41151099;W070033665
KACT;WACO RGNL;00516;N31364064;W097134987
..
..

and here are some rules/tests:

<xml>
<group id="group_1" description="rule groups to check airport record  
consistency">
        <subgroup id="subgroup_1" description="check icao code"  
ruleoperator="and">
               <rule id="rule_icao_1" description="check for correct  
icao code spelling">
               <object classname="Row" method="getField" type="string"
               parameter="0" parametertype="integer"/>
               <expected value="[A-Z]{4}" type="string"/>
               <execute value="com.datamelt.rules.implementation.CheckMatches">
               </execute>
               <message type="failed" text="ICAO code field of $1 does  
not match
               to expected value: $0" />
               <message type="passed" text="Correct match of ICAO code field to
               expected value: $0" />
               </rule>
               ...
        </subgroup>
        <subgroup id="subgroup_1" description="check lat-long values"
        intergroupoperator="and" ruleoperator="and">
               ...
               <rule id="rule_longitude_0" description="check for  
correct longitude
               value">
               <object classname="Row" method="getField" type="string"
               parameter="4" parametertype="integer"/>
               <expected value="[WE][0-9]{9}" type="string"/>
               <execute value="com.datamelt.rules.implementation.CheckMatches">
               </execute>
               <message type="failed" text="Longitude field $1 does  
not match to
               expected value: $0" />
               <message type="passed" text="Correct match of longitude field to
               expected value: $0" />
               </rule>
        </subgroup>
</group>
</xml>

as you are all IT experts, I guess you get the point of the xml file.

maybe you can use it during your training classes and share it with  
your students. everything is free of course and you can get the source  
code on request from me.

the documentation is available here:  
http://datamelt.com/java-datamelt/jare_v0.51.pdf
the package (including docu):  
http://datamelt.com/java-datamelt/jare_ruleengine_0.51.zip

as I put a lot of effort in it, I would be happy if at least one  
person except me finds it useful.

tks. also for feedback.

rgds,

uwe