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import java.util.HashSet;
import java.util.Set;

import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
import javax.ws.rs.core.Context;

import javax.servlet.ServletContext;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


// App will be hosted at localhost:8080/HelloRESTEasy/rest/(etc)

@ApplicationPath("/rest")
public class ServletHook extends Application {

    @Context
    ServletContext _servletContext = null;

    private Set<Object> _singletons = null;

    private static Logger _logger = null;
    static {
        _logger = LoggerFactory.getLogger(ServletHook.class);
    }

    public ServletHook() {
        _logger.info("Creating ServletHook instance: " + this);
    }

    @Override
    public Set<Object> getSingletons() {
        // Lazy initialization.
        if (_singletons == null) {
            _singletons = new HashSet<Object>();
            if (_servletContext == null) {
                _logger.warn("Application's reference to servlet context is null.");
            }

            // Java class handling REST requests. (ServletContext passed for convenience.)
            _singletons.add(new HelloWorldService(_servletContext));
        }
        return _singletons;
    }
}