Greetings, I want to make available patches I've made to version 2.1.7 in order to be more memory and cpu efficient (due to avoiding the creation of unnecessary objects). We're not ready to make the jump to 5.x and so we're staying with 2.1.7 for the forseeable future. I haven't looked at the 5.x source but maybe some of these changes can be ported.
This patch: 1. Caches and reuses lots of the objects created when reading in PDF files: PdfString, PdfNumber, and PdfName. 2. Removes the PdfNumber mutator method increment(). 3. Interns strings that are tokens in font files 4. Provides initial capacities for the HashMaps used to store font information. I've taken the liberty of removing the increment() method from PdfNumber because these objects should not be modified if we are caching them and I didn't find any uses of the method. You're free to keep the method and not cache PdfNumber as you see fit. One area that may need closer review is the caching of PdfString objects when the two ints objNum and objGen are passed in. Apparently they're used for encryption but I didn't grok the code. Currently those ints are ignored when caching PdfString values. If it's necessary to cache PdfString objects based on them, either add them as part of the key or don't cache them. See getPdfString() in PdfReader. Also, I kept the HashMaps in the PdfReader class for my convenience. If I were maintaining this code longer term, I might think about relocating them. Many thanks to everyone for a great PDF library, especially to Bruno and Paulo. Feedback encouraged. Thanks, Barry
itext-2.1.7.patch
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