[PDFBOX-1390] Is COSNumber mutable or immutable?

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Not A Problem
• Affects Version/s: 1.7.0
• Component/s: PDModel
• Labels: COS
• Assignee: Andreas Lehmkühler
• Reporter: Aaron Stewart
• Created: 17/Aug/12 18:21
• Updated: 27/Jan/15 12:28
• Resolved: 27/Jan/15 12:28

Description

I'm writing code to clone a PDPage as a deep copy. I'm trying to decide which objects are mutable and which are immutable.

COSInteger is confusing. It has a factory method, which suggests there is some internal caching going on, but it also has a setValue() method. Caching makes sense for immutable objects. If it is caching values, then setValue() should probably be deprecated or removed.

• * *

Proposed JUnit code:

COSInteger original = COSInteger.get(1);
COSInteger copy = COSInteger.get(1);
copy.setValue(5);
assertEquals(1L, original.longValue());