CODEWITHSUNDEEP
javaobjective-cj2objc
Adil Hussain
Adil Hussain

Reputation: 32161

How to translate an entire folder or package from Java to Objective-C?

I've used an older version of Google's Java to Objective-C (J2ObjC) converter previously (i.e. version 0.5.2) and it was straightforward to translate an entire folder of Java files to their equivalent Objective-C files (and to preserve the directory structure in doing so). I just had to run the following shell executable:

$ ./run.sh —-preservedirs <path to input folder>

I've just downloaded the latest version of J2ObjC (i.e. version 0.9.1) and it's not clear from the Getting Started page or elsewhere how I can translate an entire folder of Java files rather than just a single Java file using the j2obc executable. The only example provided in the Getting Started page is to translate a single Java file which has no dependencies or imports elsewhere as follows:

$ ./j2objc Hello.java

Can anyone provide me with an example of how to translate an entire package assuming I have a folder named input which contains my com package which contains all of the sub-packages and Java files that I want to translate?

Upvotes: 3

Views: 2244

Answers (2)

tball
tball

Reputation: 2044

To build a whole project, I add the source root(s) to the -sourcepath, then use the find command to locate all Java sources. For example, to build Square.com's Dagger library:

$ export J2OBJC=~/j2objc   # change to wherever your distribution is
$ cd ~/src/dagger/core
$ $J2OBJC/j2objc -d build_output -sourcepath src/main/java \
    -classpath $J2OBJC/lib/javax-inject.jar \
    `find src/main/java -name '*.java'`

All the generated .h and .m files are now in the build_output directory, in subdirectories according to their package (like javac does). To compile all the .m files into a static library, I use:

$ cd build_output
$ j2objcc -c -I. `find . -name '*.m'`
$ libtool -static -o libdagger.a *.o

Upvotes: 7

Andy Turner
Andy Turner

Reputation: 140484

If there is no better way built into run.sh, you could use find's -exec flag:

find <path to input folder> -type f -exec --preservedirs ./run.sh {} \;

Or, you could use xargs to do multiple files at the same type:

find <path to input folder> -type f | xargs ./run.sh --preservedirs

(You might also need to add -name "*.java" to the find arguments if there are non-Java files in your directories).

Upvotes: 2

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