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From Cédric Champeau (JIRA) <>
Subject [jira] Created: (LUCENE-1257) Port to Java5
Date Wed, 02 Apr 2008 08:30:24 GMT
Port to Java5

                 Key: LUCENE-1257
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Analysis, Examples, Index, Other, Query/Scoring, QueryParser, Search,
Store, Term Vectors
    Affects Versions: 2.3.1
            Reporter: Cédric Champeau
         Attachments: java5.patch

For my needs I've updated Lucene so that it uses Java 5 constructs. I know Java 5 migration
had been planned for 2.1 someday in the past, but don't know when it is planned now. This
patch against the trunk includes :

- most obvious generics usage (there are tons of usages of sets, ... Those which are commonly
used have been generified)
- PriorityQueue generification
- replacement of indexed for loops with for each constructs
- removal of unnececessary unboxing

The code is to my opinion much more readable with those features (you actually *know* what
is stored in collections reading the code, without the need to lookup for field definitions
everytime) and it simplifies many algorithms.

Note that this patch also includes an interface for the Query class. This has been done for
my company's needs for building custom Query classes which add some behaviour to the base
Lucene queries. It prevents multiple unnnecessary casts. I know this introduction is not wanted
by the team, but it really makes our developments easier to maintain. If you don't want to
use this, replace all /Queriable/ calls with standard /Query/.

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