(here is where I ran into coding trouble - I had a huge switch based on RecordType and a method to extract the data based on record types. Get the specifications for this row - in my case the first 3 characters of each row are the row type identifierĬreate Collection to store decomposed objects (ie whatever each row holds the data for)įor each specification in row specifications determine the specifications required to decompose this file It gets trickier when you have to know what the previous line was in order to apply the correct specification to the current line. Using this data I can create a collection of detail specifications that defines a row, and either parse it or build it against that specification. ![]() The detail rows contain the following fields, Id, RecordTypeId, FieldName, StartPosition, FieldLength, Description, IsFieldPadded, PaddingCharacter, FieldFormattingString, PaddingDirection, HasConstantValue, ConstantValue, DataTypeId. This allows me to define any specification including versions of the specifications. I created a few tables in a database to store the data for the specifications of the file. Its been a while and I developed my own solution. The other trick is that I use the field name to match the object field name to reflect back and set the field formatting and the field data, so I have to make sure those items match or decorate them somehow or build a mapping of some sort.Īnyway, any ideas would be appreciated! Also, I need to go both ways, in other words, I need to use the rowspecs to build a file or to parse the file. Does anyone have a good suggestion for how to apply a design pattern for this type of situation? Multiple patterns? I have coded it to make it work, but it seems very clunky and riddled with possible errors. Some times there is some conversion of the data, or a lookup that needs to occur on a piece of data, and sometimes there are some special rules like formatting etc. I iterate through the specific specs for that row and assign the data to that field in the appropriate element. I open the file and I read each row and based on the first three characters I pull the specifications for that row. I have created a data table that contains the specifications, and I am able to get the specifications into an object List no problem. Say the first row specification level 100 a header row and all 200s are data rows and level 199 is a file summary. You also learn a subset of UML notation to expedite communicating through design instead of code.I have a flat file where each row has a specification. ![]() The lab exercises show you how to identify, apply, and re-factor selected patterns into code, using a NetBeans or Eclipse IDE and the GlassFish Application Server v3. You learn the depth and evolution of pattern-based techniques in Java with particular emphasis on Java EE 6 conventions. ![]() The Java Patterns course reviews common and emerging patterns specific to Java SDK and EE development. The conventions of design pattern documentation make it easier for development teams to communicate their programming intentions and provide a reference point for the entire Java development community. In design patterns, the responsibility of each component is identified by role. These practices, referred to as design patterns, document well-known names, code implementation and re-factoring techniques, and the risks and trade-offs associated with using them. The Java language and popular Java-based frameworks incorporate more proven development practices into their programming interfaces with each major release.
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