[jira] [Created] (TINKERPOP3-848) Support default attribute values in GraphMLReader

["Pavel Klinov (JIRA)" <ji...@apache.org>]

Pavel Klinov created TINKERPOP3-848:
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             Summary: Support default attribute values in GraphMLReader
                 Key: TINKERPOP3-848
                 URL: https://issues.apache.org/jira/browse/TINKERPOP3-848
             Project: TinkerPop 3
          Issue Type: Improvement
          Components: io
    Affects Versions: 3.0.1-incubating
         Environment: All
            Reporter: Pavel Klinov
            Assignee: stephen mallette
            Priority: Minor


Looking at the code of GraphMLReader I see that it doesn't support default values of attributes, which are allowed by the GraphML spec. This is a bit annoying especially if the input defines default values for attributes which are used for mandatory data, e.g. edge labels. 

One small example is the sample graph at [1]. "d_e" is the label attribute with a default value. There're <edge .. /> elements w/o body later in the document and reading those will throw a "java.lang.IllegalArgumentException: Label can not be null" exception (if the vendor considers edge labels mandatory).

I'd personaly squash both keyIdMap and keyTypesMap into a single String -> AttrInfo map, where AttrInfo would contain information about the data attribute name, type, and the default value.

[1] http://www.eecs.wsu.edu/~yyao/DirectedStudyI/Datasets/AS/sample.graphml




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