travis: adding java builds to Travis CI

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

.travis.yml

@@ -8,10 +8,14 @@ install:
   - sudo apt-get update -qq
   - sudo apt-get install -y -qq swig3.0 python git cmake
   - sudo ln -s /usr/bin/swig3.0 /usr/bin/swig
+  - sudo update-java-alternatives -s java-8-oracle
+before_script:
+  - if [ "$CC" = "gcc" ]; then export BUILDJAVA=ON; else export BUILDJAVA=OFF; fi
+  - export JAVA_HOME=/usr/lib/jvm/java-8-oracle
 script:
   - git clone --branch=master https://github.com/intel-iot-devkit/mraa.git
-  - cd mraa && mkdir build && cd build && cmake -DENABLEEXAMPLES=OFF -DCMAKE_INSTALL_PREFIX:PATH=. -DNODE_ROOT_DIR:PATH=/home/travis/.nvm/v0.10.36/include .. && make && make install
+  - cd mraa && mkdir build && cd build && cmake -DBUILDSWIGJAVA=$BUILDJAVA -DENABLEEXAMPLES=OFF -DCMAKE_INSTALL_PREFIX:PATH=. -DNODE_ROOT_DIR:PATH=/home/travis/.nvm/v0.10.36/include .. && make && make install
   - export PKG_CONFIG_PATH=$PWD/lib/pkgconfig:$PWD/lib/x86_64-linux-gnu/pkgconfig
   - export CPLUS_INCLUDE_PATH=$PWD/include
   - export LIBRARY_PATH=$PWD/lib:$PWD/lib/x86_64-linux-gnu
-  - cd ../.. && mkdir build && cd build && cmake -DNODE_ROOT_DIR:PATH=/home/travis/.nvm/v0.10.36/include -DBUILDEXAMPLES=ON .. && make
+  - cd ../.. && mkdir build && cd build && cmake -DBUILDSWIGJAVA=$BUILDJAVA -DNODE_ROOT_DIR:PATH=/home/travis/.nvm/v0.10.36/include -DBUILDEXAMPLES=ON .. && make