JNISetup.java

package com.roboclub.robobuggy.main;

import java.lang.reflect.Field;
import java.util.Arrays;

/**
 * Class used to link the native library to the project
 */
public class JNISetup {

    /**
     * Includes all of the jni libraries that we need to be able to use all of our libraries
     *
     * @return true iff the setup completes successfully
     * @throws NoSuchFieldException     couldn't find the usr_paths
     * @throws SecurityException        couldn't get the field
     * @throws IllegalArgumentException didn't have the right params for the reflected method
     * @throws IllegalAccessException   reflected method didn't exist
     */
    public static boolean setupJNI() throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
        final String pathToAdd = "library";
        final Field usrPathsField = ClassLoader.class.getDeclaredField("usr_paths");
        usrPathsField.setAccessible(true);

        //get array of paths
        final String[] paths = (String[]) usrPathsField.get(null);
        //check if the path to add is already present
        for (final String path : paths) {
            if (path.equals(pathToAdd)) {
                return true;
            }
        }

        //add the new path
        final String[] newPaths = Arrays.copyOf(paths, paths.length + 1);
        newPaths[newPaths.length - 1] = pathToAdd;
        usrPathsField.set(null, newPaths);

        return true;
    }

}