Add reset(AttributeSource) method to AttributeSource
----------------------------------------------------
Key: LUCENE-1842
URL: https://issues.apache.org/jira/browse/LUCENE-1842
Project: Lucene - Java
Issue Type: Wish
Components: Analysis
Reporter: Tim Smith
Fix For: 2.9
Originally proposed in LUCENE-1826
Proposing the addition of the following method to AttributeSource
{code}
public void reset(AttributeSource input) {
if (input == null) {
throw new IllegalArgumentException("input AttributeSource must not be
null");
}
this.attributes = input.attributes;
this.attributeImpls = input.attributeImpls;
this.factory = input.factory;
}
{code}
Impacts:
* requires all TokenStreams/TokenFIlters/etc to call addAttribute() in their
reset() method, not in their constructor
* requires making AttributeSource.attributes and AttributeSource.attributesImpl
non-final
Advantages:
Allows creating only a single actual AttributeSource per thread that can then
be used for indexing with a multitude of TokenStream/Tokenizer combinations
(allowing utmost reuse of TokenStream/Tokenizer instances)
this results in only a single "attributes"/"attributesImpl" map being required
per thread
addAttribute() calls will almost always return right away (will only be
"initialized" once per thread)
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