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From "Oliver Heger (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CLI-144) adding a FileValidator results in ClassCastException in parser.parseAndHelp(args)
Date Mon, 14 Jul 2008 20:18:31 GMT

     [ https://issues.apache.org/jira/browse/CLI-144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Oliver Heger updated CLI-144:
-----------------------------

    Attachment: BugCLI144Test_oh.java

A slightly modified version of the unit test provided by David Biesack. This version also
tests whether the expected file is returned as the value of the option. I(t also adds the
license header.)

> adding a FileValidator results in ClassCastException in parser.parseAndHelp(args)
> ---------------------------------------------------------------------------------
>
>                 Key: CLI-144
>                 URL: https://issues.apache.org/jira/browse/CLI-144
>             Project: Commons CLI
>          Issue Type: Bug
>          Components: CLI-2.x
>         Environment: Windows XP
>            Reporter: David Biesack
>             Fix For: 2.0
>
>         Attachments: BugCLI144Test.java, BugCLI144Test_oh.java, CLI-144.patch
>
>
> When I add a FileValidator.getExistingFileInstance() to an Argument, I get a ClassCastException
when I parse args.
> Below is a testcase invoke with
>    java org.apache.commons.cli2.issues.CLI2Sample -classpath commons-cli-2.0-SNAPSHOT.jar
--file-name path-to-an-existing-file
> Run it and you get:
> Exception in thread "main" java.lang.ClassCastException: java.io.File cannot be cast
to java.lang.String
> 	at org.apache.commons.cli2.validation.FileValidator.validate(FileValidator.java:122)
> 	at org.apache.commons.cli2.option.ArgumentImpl.validate(ArgumentImpl.java:250)
> 	at org.apache.commons.cli2.option.ParentImpl.validate(ParentImpl.java:123)
> 	at org.apache.commons.cli2.option.DefaultOption.validate(DefaultOption.java:175)
> 	at org.apache.commons.cli2.option.GroupImpl.validate(GroupImpl.java:264)
> 	at org.apache.commons.cli2.commandline.Parser.parse(Parser.java:105)
> 	at org.apache.commons.cli2.commandline.Parser.parseAndHelp(Parser.java:125)
> 	at org.apache.commons.cli2.issues.CLI2Sample.main(CLI2Sample.java:38)
> Comment out the withValidator call and it runs with no exception. 
> I also get a similar ClassCastException if I add a 
>   .withValidator(NumberValidator.getIntegerInstance())
> to another option/argument.
> Here is the source
> package org.apache.commons.cli2.issues;
> import java.io.File;
> import org.apache.commons.cli2.CommandLine;
> import org.apache.commons.cli2.Group;
> import org.apache.commons.cli2.builder.ArgumentBuilder;
> import org.apache.commons.cli2.builder.DefaultOptionBuilder;
> import org.apache.commons.cli2.builder.GroupBuilder;
> import org.apache.commons.cli2.commandline.Parser;
> import org.apache.commons.cli2.option.DefaultOption;
> import org.apache.commons.cli2.validation.FileValidator;
> public class CLI2Sample
> {
>    public static void main(String[] args)
>    {
>       final DefaultOptionBuilder obuilder = new DefaultOptionBuilder();
>       final ArgumentBuilder abuilder = new ArgumentBuilder();
>       final GroupBuilder gbuilder = new GroupBuilder();
>       DefaultOption fileNameOption = obuilder
>             .withShortName("f")
>             .withLongName("file-name")
>             .withRequired(true)
>             .withDescription("name of an existing file")
>             .withArgument(abuilder
>                   .withName("file-name")
>                   .withValidator(FileValidator.getExistingFileInstance())
>                   .create())
>             .create();
>       Group options = gbuilder
>             .withName("options")
>             .withOption(fileNameOption)
>             .create();
>       Parser parser = new Parser();
>       parser.setHelpTrigger("--help");
>       parser.setGroup(options);
>       CommandLine cl = parser.parseAndHelp(args);
>      }
> }

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