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package mypackage;
import java.util.Properties;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
import com.affymetrix.genometryImpl.util.FloatTransformer;

public class MyActivator implements BundleActivator {
    private BundleContext bundleContext;
    private ServiceRegistration serviceRegistration;
    protected BundleContext getContext() {
        return bundleContext;
    }
    public void start(BundleContext _bundleContext) throws Exception {
        bundleContext = _bundleContext;
        serviceRegistration =
            bundleContext.registerService(FloatTransformer.class.getName(),
            new MyTransformer(), new Properties());
    }
    public void stop(BundleContext _bundleContext) throws Exception {
        if (serviceRegistration != null) {
            serviceRegistration.unregister();
        }
        bundleContext = null;
    }
}

package mypackage;
import com.affymetrix.genometryImpl.util.FloatTransformer;
public class MyTransformer implements FloatTransformer {
    final String paramPrompt;
    final String name;
    public MyTransformer() {
        super();
        paramPrompt = null;
        name = "MyTransformer";
    }
    public String getParamPrompt() { return null; }
    public String getName() {
        return name;
    }
    public String getDisplay() {
        return name;
    }
    public float transform(float x) {
        return x; // boring, put your own math function here, return 1.0/x; or return 3*x*x*x - 2*x*x +8*x - 6;
    }
    public boolean setParameter(String s) {
        return true;
    }
}