package tutorial.example6var;
 
import java.util.Properties;
import java.util.StringTokenizer;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.util.tracker.ServiceTracker;
import tutorial.example2.service.DictionaryService;
 
/**
 *
 * @author Nico
 */
public class Activator implements BundleActivator {
    // Bundle's context.
    private BundleContext m_context = null;
    // The service tacker object.
    private ServiceTracker m_tracker = null;
 
    public void start(BundleContext context) throws Exception {
        this.m_context = context;
 
        // Create a service tracker to monitor dictionary services.
        m_tracker = new ServiceTracker(
            m_context,
            m_context.createFilter(
                "(&" +
                    "(objectClass=" + DictionaryService.class.getName() + ")" +
                    "(Language=*)" +
                    "(!(Language=Meta))" +
                 ")"),
            null);
        m_tracker.open();
 
        Properties props = new Properties();
        props.put("Language", "Meta");
 
        m_context.registerService(DictionaryService.class.getName(), new MetaSpellChecker(), props);
 
    }
 
    /**
     * Implements BundleActivator.stop(). Does nothing since
     * the framework will automatically unget any used services.
     * @param context the framework context for the bundle.
    **/
    public void stop(BundleContext context)
    {
    }
 
    public class MetaSpellChecker implements tutorial.example2.service.DictionaryService {
        // now could also be multiples
        public boolean checkWord(String word) {
 
            // No misspelled words for an empty string.
            if ((word == null) || (word.length() == 0)) {
                return true;
            }
 
            // Tokenize the passage using spaces and punctionation.
            StringTokenizer st = new StringTokenizer(word, " ,.!?;:");
 
            // get the list of all available spell checker services
            Object[] spellchecker_objects = m_tracker.getServices();
 
            if ( (spellchecker_objects == null) || (spellchecker_objects.length == 0) )
                return false;
 
            while (st.hasMoreTokens()) {
                String singleWord = st.nextToken();
 
                boolean found = false;
                for (Object o : spellchecker_objects) {
 
                    if (o == null)
                        continue;
 
                    DictionaryService ds = (DictionaryService) o;
                    if (ds.checkWord(singleWord))  {
                        found = true;
                        break;
                    }
                }
 
                if (!found)
                    return false;
            }
 
            return true;
        }
 
    }
}