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https://issues.apache.org/jira/browse/UIMA-2391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13262003#comment-13262003
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Marshall Schor commented on UIMA-2391:
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Re: avoiding runtime exception: this would not happen because (1) the type
system description would no longer be using the Allowed Values (therefore, it
would allow all values), and (2) the additional user code you would invoke
whenever you needed to check, would compare the value against a parameterized
set of allowed values, which you could specify at runtime.
> Uima type merging for string subtypes not working
> -------------------------------------------------
>
> Key: UIMA-2391
> URL: https://issues.apache.org/jira/browse/UIMA-2391
> Project: UIMA
> Issue Type: Bug
> Components: Core Java Framework
> Affects Versions: 2.3.1AS
> Environment: Linux on Power
> Reporter: Charles de Saint-Aignan
> Priority: Critical
> Attachments: UIMA-2391.patch
>
>
> The basic situation is that we are providing a UIMA-based core that other
> teams can extend to suit their needs. As such we are making use of UIMA type
> merging to allow them to add new features to existing types. This approach
> works fine since JCasGen merges the two definitions of the given type and
> produces a superset of the features. This is well documented here:
> http://uima.apache.org/d/uimaj-2.3.1/references.html#ugr.ref.jcas.merging_types.jcasgen_support
>
> However, in addition to this, we have the case where we have a string subtype
> with given allowedValues - lets say values a, b and c. The other team wants
> to extend this type and have additional allowedValues, say value d. Ideally,
> what I would like to do is the following (which follows the pattern used for
> adding features):
> Type Definition #1 (provided by core):
> <typeDescription>
> <name>com.ibm.Type</name>
> <description></description>
> <supertypeName>uima.cas.String</supertypeName>
> <allowedValues>
> <value>
> <string>a</string>
> <description></description>
> </value>
> <value>
> <string>b</string>
> <description></description>
> </value>
> <value>
> <string>c</string>
> <description></description>
> </value>
> </allowedValues>
> </typeDescription>
> Type Definition #2 (extension to core):
> <typeDescription>
> <name>com.ibm.Type</name>
> <description></description>
> <supertypeName>uima.cas.String</supertypeName>
> <allowedValues>
> <value>
> <string>d</string>
> <description></description>
> </value>
> </allowedValues>
> </typeDescription>
> In this case I wanted UIMA to recognize the two definitions at runtime and
> allow the superset of allowedValues. However, this does not do the trick -
> at runtime UIMA throws an exception saying that value d is not an allowed
> value for com.ibm.Type.
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