Add introspection API to AttributeSource/AttributeImpl
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Key: LUCENE-2374
URL: https://issues.apache.org/jira/browse/LUCENE-2374
Project: Lucene - Java
Issue Type: Improvement
Components: Analysis, Other
Reporter: Uwe Schindler
Assignee: Uwe Schindler
Fix For: 3.1
AttributeSource/TokenStream inspection in Solr needs to have some insight into
the contents of AttributeImpls. As LUCENE-2302 has some problems with
toString() [which is not structured and conflicts with CharSequence's
definition for CharTermAttribute], I propose an simple API that get a default
implementation in AttributeImpl (just like toString() current):
- Iterator<Map.Entry<String,?>> AttributeImpl.contentsIterator() returns an
iterator (for most attributes its a singleton) of a key-value pair, e.g.
"term"->"foobar","startOffset"->Integer.valueOf(0),...
- AttributeSource gets the same method, it just concat the iterators of each
getAttributeImplsIterator() AttributeImpl
No backwards problems occur, as the default toString() method will work like
before (it just gets iterator and lists), but we simply remove the
documentation for the format. (Char)TermAttribute gets a special impl fo
toString() according to CharSequence and a corresponding iterator.
I also want to remove the abstract hashCode() and equals() methods from
AttributeImpl, as they are not needed and just create work for the implementor.
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