ZF-5650: Memoize namespace lookup results in Zend_Gdata


Since adding versioned namespace support to Zend_Gdata, we're spending a large amount of time during feed parsing determining the proper namespace to use for a given version.

This can be remedied by memoizing the results from Zend_Gdata_App_Base::lookupNamespace().


Committed to trunk in r13817. Committed to release-1.7 in r13818.

Benchmark execution time reduced from 650 ms to 450 ms, delta = 200 ms.

Marking as fixed for next mini release.

correct fix version