tianjianjiang / objclucene

An Objective-C port of Lucene 5.x

An Experimental Objective-C Port of Lucene 5.x

ObjCLucene is an experimental Objective-C port of Lucene. The port is done by using Google's j2objc, and the goal is to make the porting process applicable to subsequent versions of Lucene.

A sample app can be found here: LuceneSearchDemo-iOS.

Currently an Xcode project is provided to build the static library of all the translated Lucene packages:

• lucene-analyzers-common (but without those that need BreakIterator)
• lucene-core
• lucene-highlighter
• lucene-join
• lucene-memory
• lucene-misc (but no org.apache.lucene.store.*)
• lucene-queries
• lucene-queryparser
• lucene-sandbox
• lucene-suggest

The resulting library is huge and may not be suitable for making apps intended for the App Store.

This should be considered an experimental project, and there are a number of issues that I've already found:

• There are some small leaks in reading and searching with the index. I've already fixed some of them, but there are still some leaks that will require further investigation.
• There are more leaks to be fixed in index writers.
• The translated AnalyzingInfixSuggester does not produce correct suggestion indices. It reads indices built elsewhere fine. I don't know why that is so. Perhaps some byte ordering or some Java-to-Objective-C nuances involved.
• Highlighting is slow in the translated code.

Please see the Mobile Lucene project for more information.

Building the Xcode Project

To build the Xcode project, make sure that you have j2objc installed in vendor/j2objc. You can run the script setup-j2objc.sh to do that for you.