Expanded syntax for environment variable replacement
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Key: OODT-405
URL: https://issues.apache.org/jira/browse/OODT-405
Project: OODT
Issue Type: Improvement
Components: opendapps
Reporter: Luca Cinquini
Currently, the CAS metadata PathUtils class contains functionality to replace a
pattern of the form '[key]' with a comma-separated list of values for the
environment variable named 'key'.
For example, a metadata value of the form 'http://somedomain/show=[variable]/'
would be replaced with 'http://somdomain/show=lat,lon,temp,prcp/' if 'variable'
has multiple values 'lat','lon','temp' and'prcp'.
Most of the times, this is the expected behavior of the application. Sometimes
though the desired behavior is to loop over all the possible values, and
generated one new value for each replacement. For example, the CMDS application
needs to generate a new URL per variable replacement, resulting in the
following multiple values:
'http://somdomain/show=lat/'
'http://somdomain/show=lon/'
'http://somdomain/show=temp/'
'http://somdomain/show=prcp/'
It is proposed to introduce a new env variable syntax to support this behavior:
'[@variable]'. If the '@' character is found, the application will loop over
all the available env values, and generate a new metadata field for each. These
values would then be further analyzed for the standard env replacement
processing.
For now, it is proposed that support for the new syntax be only implemented
within the opendap-ps module, and possibly later made available as a general
CAS utility.
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