Refactoring of metadata extraction functionality for opendapps module
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Key: OODT-368
URL: https://issues.apache.org/jira/browse/OODT-368
Project: OODT
Issue Type: Improvement
Components: opendapps
Affects Versions: 0.4
Reporter: Luca Cinquini
The main purpose of this patch is to refactor the metadata parsing
functionality into an extensible framework of MetadataExtractors. The
MetadataExtractor interface defines the general capability of parsing a
metadata source and adding (name,value) pairs into the CAS metadata container.
The existing code for parsing THREDDS metadata catalogs has been moved from the
DatasetCrawler class to a ThreddsMetadataExtractor that implements the
aforementioned interface. Additionally, another implementation,
DasMetadataExtractor, has been added to parse an Opendap DAS stream and capture
the NetCDF global attributes (for now). Finally, an NcmlMetadataExtractor has
been added as a stub implementation for future parsing of NcML documents.
The patch also contains the following changes and additions:
o The OODT profiles are assigned a UUID as identifier, since the THREDDS
dataset ID is used as the resource identifier
o The THREDDS catalogs are parsed to extract the CF standard names and variable
long names, where found
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