Java Code Examples for org.kohsuke.args4j.spi.OptionHandler

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I was a bit sceptical about args4j to start with, but it has grown on me. There is an initial extra args4j optionhandler example you have to make to add it to a args4j optionhandler example, but this is mostly boilerplate like args4j optionhandler example. Just add a field or method which sets the value you want, and put a Option annotation on it.

I found I wanted to have options which could either be disabled, enabled with a default value, or enabled with a provided argument. I managed to put together args4j optionhandler example own OptionHandler implementation to deal with this. Though the astute reader will notice it only deals with Integer or Double valued options at the moment. Your email is never published nor shared.

This hCard created with the hCard creator. There is an initial extra step you have to make to add it to a program, but this is mostly boilerplate like this: CmdLineException ; import org. CmdLineParser ; import org. OptionDef ; import org. DoubleOptionHandler ; import org. IntOptionHandler ; import org. OptionHandler ; import org.

Parameters ; import org. This entry was written by Edward and posted on December 18, at Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Posted February 4, at Post a Comment Your email is never published nor shared. About Edward Edward Harman jaq ethelred.

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Because we only want to have a very small example, we use only one single directory containing all the stuff— sources, class files and the args4j jarfile.

You need a JDK 1. Create the business bean Business. At this point, it only contains the business logic. To run this logic, we want a run method. The starter class had a look into the Java system property mainclass loads that class, instantiates it, and executes their run method. We provide the classpath so the Java VM could find the starter class and our business class.

The starter class catches this and prints a help message: Since we don't have an Argument , that line is not Business [options] arguments. As you can see, we added an Option to an attribute and to a setter method.

Using this with attributes is the simplest way to use args4j. But if you wanted to do some checks e. If you want to have more control over parsing and error handling, don't use the starter.

Since we're not using the Starter , we also have to supply the main method and start it. So, after compiling, we could start that with:. Content Navigation Footer args4j parent args4j: Java command line arguments parser. Prepare your environment Because we only want to have a very small example, we use only one single directory containing all the stuff— sources, class files and the args4j jarfile.

Create a directory args4j-sample this will be our project directory. Download the latest args4j version from the download page Extract the args4j- version. Implementing pure business logic Create the business bean Business. Start the class Now we have three options for setting the field from the command line: Start the class java -classpath. Starter -name "Hrld" -file args4j Adding Args4J Annotations Well, we don't have any annotations to handle the command line parameters yet.

Sets a file if that is present -name VAL: Enhancing the parsing If you want to have more control over parsing and error handling, don't use the starter. Here are the main steps: