DeferredResourceConfig.java

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package com.sun.jersey.server.impl.application;

import com.sun.jersey.api.container.ContainerException;
import com.sun.jersey.api.core.DefaultResourceConfig;
import com.sun.jersey.core.spi.component.ComponentProvider;
import com.sun.jersey.core.spi.component.ProviderFactory;
import java.util.Collections;
import java.util.Set;
import java.util.logging.Logger;
import javax.ws.rs.core.Application;

/**
 *
 * @author Paul.Sandoz@Sun.Com
 */
public class DeferredResourceConfig extends DefaultResourceConfig {

    private static final Logger LOGGER =
            Logger.getLogger(DeferredResourceConfig.class.getName());

    private final Class<? extends Application> appClass;

    private final Set<Class<?>> defaultClasses;
    
    public DeferredResourceConfig(Class<? extends Application> appClass) {
        this(appClass, Collections.<Class<?>>emptySet());
    }

    public DeferredResourceConfig(Class<? extends Application> appClass, 
            Set<Class<?>> defaultClasses) {
        this.appClass = appClass;
        this.defaultClasses = defaultClasses;
    }

    public ApplicationHolder getApplication(ProviderFactory pf) {
        return new ApplicationHolder(pf);
    }

    public class ApplicationHolder {
        private final Application originalApp;

        private final DefaultResourceConfig adaptedApp;

        private ApplicationHolder(ProviderFactory pf) {
            final ComponentProvider cp = pf.getComponentProvider(appClass);
            if (cp == null) {
                throw new ContainerException("The Application class " + appClass.getName() + " could not be instantiated");
            }
            this.originalApp = (Application)cp.getInstance();

            if ((originalApp.getClasses() == null || originalApp.getClasses().isEmpty()) &&
                    (originalApp.getSingletons() == null || originalApp.getSingletons().isEmpty())) {
                LOGGER.info("Instantiated the Application class " + appClass.getName() +
                        ". The following root resource and provider classes are registered: " + defaultClasses);
                this.adaptedApp = new DefaultResourceConfig(defaultClasses);
                adaptedApp.add(originalApp);
            } else {
                LOGGER.info("Instantiated the Application class " + appClass.getName());
                adaptedApp = null;
            }

        }

        public Application getOriginalApplication() {
            return originalApp;
        }

        public Application getApplication() {
            return (adaptedApp != null) ? adaptedApp : originalApp;
        }
    }
}