Improve performance of CharTermAttribute(Impl) and also fully implement
Appendable
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Key: LUCENE-2401
URL: https://issues.apache.org/jira/browse/LUCENE-2401
Project: Lucene - Java
Issue Type: Improvement
Components: Analysis
Reporter: Uwe Schindler
Assignee: Uwe Schindler
Fix For: 3.1
The Appendable.append(CharSequence) method in CharTermAttributes is good for
general use. But like StringBuilder has for some common use cases specialized
methods, this does the same and adds separate append methods for String,
StringBuilder and CharTermAttribute itsself. This methods enable the compiler
to directly link the specialized methods and don't use the instanceof checks.
The unspecialized method only does the instanceof checks for longer
CharSequences (>8 chars), else it simply iterates.
This patch also fixes the required special "null" handling. append() methods
are required by Appendable to append "null", if the argument is null. I dont
like this, but its required. Maybe we should document, that we dont dont
support it. Otherwise, JDK's formatter fails with formatting null.
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