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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Closed: (LUCENE-2601) Make getAttribute(Class attClass) Generic
Date Sat, 14 Aug 2010 06:45:27 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2601?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe Schindler closed LUCENE-2601.
---------------------------------

         Assignee: Uwe Schindler
    Fix Version/s: 3.0
       Resolution: Fixed

Since Lucene 3.0 this is already using generics. Only Lucene 2.9.x does not use generics,
as it is Java 1.4 only.

> Make getAttribute(Class attClass) Generic
> -----------------------------------------
>
>                 Key: LUCENE-2601
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2601
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Other
>    Affects Versions: 2.9.1, 2.9.2, 2.9.3, 3.0, 3.0.1, 3.0.2
>            Reporter: wenbin.zhu
>            Assignee: Uwe Schindler
>             Fix For: 3.0
>
>
> org.apache.lucene.util.AttributeSource
> current:
> public Attribute getAttribute(Class attClass) {
>     final Attribute att = (Attribute) this.attributes.get(attClass);
>     if (att == null) {
>       throw new IllegalArgumentException("This AttributeSource does not have the attribute
'" + attClass.getName() + "'.");
>     }
>     return att;
> }
> sample usage:
> TermAttribute termAtt = (TermAttribute)ts.getAttribute(TermAttribute.class)
> my improvment:
> @SuppressWarnings("unchecked")
> 	public <T> T getAttribute2(Class<? extends Attribute> attClass) {
>     final T att = (T) this.attributes.get(attClass);
>     if (att == null) {
>       throw new IllegalArgumentException("This AttributeSource does not have the attribute
'" + attClass.getName() + "'.");
>     }
>     return att;
>  }
> sample usage:
> TermAttribute termAtt = ts.getAttribute(TermAttribute.class)

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