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https://issues.apache.org/jira/browse/PDFBOX-403?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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peter_lena...@ibi.com updated PDFBOX-403:
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Affects Version/s: 0.8.0-incubator
> Findbugs reported a minor performance issue. Integer.valueOf(string);
> ---------------------------------------------------------------------
>
> Key: PDFBOX-403
> URL: https://issues.apache.org/jira/browse/PDFBOX-403
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Affects Versions: 0.8.0-incubator
> Environment: all
> Reporter: peter_lena...@ibi.com
> Priority: Trivial
>
> Below are the comments from Findbugs, PMD also reported the same problem, but
> findbugs gives a better description of the issue.
> -------------------------------------------------------------------
> [M P Bx] Method invokes inefficient Number constructor; use static valueOf
> instead [DM_NUMBER_CTOR]
> Using new Integer(int) is guaranteed to always result in a new object whereas
> Integer.valueOf(int) allows caching of values to be done by the compiler,
> class library, or JVM. Using of cached values avoids object allocation and
> the code will be faster.
> Values between -128 and 127 are guaranteed to have corresponding cached
> instances and using valueOf is approximately 3.5 times faster than using
> constructor. For values outside the constant range the performance of both
> styles is the same.
> Unless the class must be compatible with JVMs predating Java 1.5, use either
> autoboxing or the valueOf() method when creating instances of Long, Integer,
> Short, Character, and Byte.
> public Integer getRotation()
> {
> Integer retval = null;
> COSNumber value = (COSNumber)page.getDictionaryObject(
> COSName.ROTATE );
> if( value != null )
> {
> //Change this:
> retval = new Integer( value.intValue() ); // to this, so the
> first 127 rotation numbers will be cached Integer
> values:
> retval = Integer.valueOf(value.intValue());
> }
> return retval;
> }
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