Shawn Heisey created SOLR-4048:
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Summary: Add a "getRecursive" method to NamedList
Key: SOLR-4048
URL: https://issues.apache.org/jira/browse/SOLR-4048
Project: Solr
Issue Type: New Feature
Affects Versions: 4.0
Reporter: Shawn Heisey
Priority: Minor
Fix For: 4.1
Most of the time when accessing data from a NamedList, what you'll be doing is
using get() to retrieve another NamedList, and doing so over and over until you
reach the final level, where you'll actually retrieve the value you want.
I propose adding a method to NamedList which would do all that heavy lifting
for you. I created the following method for my own code. It could be adapted
fairly easily for inclusion into NamedList itself. The only reason I did not
include it as a patch is because I figure you'll want to ensure it meets all
your particular coding guidelines, and that the JavaDoc is much better than I
have done here:
{code}
/**
* Recursively parse a NamedList and return the value at the last level,
* assuming that the object found at each level is also a NamedList. For
* example, if "response" is the NamedList response from the Solr4 mbean
* handler, the following code makes sense:
*
* String coreName = (String) getRecursiveFromResponse(response, new
* String[] { "solr-mbeans", "CORE", "core", "stats", "coreName" });
*
*
* @param namedList the NamedList to parse
* @param args A list of values to recursively request
* @return the object at the last level.
* @throws SolrServerException
*/
@SuppressWarnings("unchecked")
private final Object getRecursiveFromResponse(
NamedList<Object> namedList, String[] args)
throws CommonSolrException
{
NamedList<Object> list = null;
Object value = null;
try
{
for (String key : args)
{
if (list == null)
{
list = namedList;
}
else
{
list = (NamedList<Object>) value;
}
value = list.get(key);
}
return value;
}
catch (Exception e)
{
throw new SolrServerException(
"Failed to recursively parse
NamedList", e);
}
}
{code}
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