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/*
 * InstanceResolverImpl.java
 *
 * Created on May 29, 2007, 10:41 AM
 *
 * @author Mike Grogan
 */

package com.sun.enterprise.webservice;
import com.sun.istack.NotNull;
import com.sun.xml.ws.api.message.Packet;
import com.sun.xml.ws.api.server.ResourceInjector;
import com.sun.xml.ws.api.server.InstanceResolver;
import com.sun.xml.ws.api.server.WSEndpoint;
import com.sun.xml.ws.api.server.WSWebServiceContext;
import com.sun.xml.ws.api.server.Invoker;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import javax.xml.ws.Provider;




public final class InstanceResolverImpl<T> extends InstanceResolver<T> {
   
    //delegate to this InstanceResolver
    private final InstanceResolver<T> resolver;
    private final T instance;

    public  InstanceResolverImpl(@NotNull Class<T> clasz) {    
        instance = InstanceResolver.createNewInstance(clasz);
        resolver = InstanceResolver.createSingleton(instance);
    }

    public @NotNull T resolve(Packet request) {
        return resolver.resolve(request);
    }

    public void start(WSWebServiceContext wsc, WSEndpoint endpoint) {
       
        getResourceInjector(endpoint).inject(wsc, instance);
    }

    public void dispose() {
        resolver.dispose();
    }
    
    private ResourceInjector getResourceInjector(WSEndpoint endpoint) {
        ResourceInjector ri = endpoint.getContainer().getSPI(ResourceInjector.class);
        if(ri==null)
            ri = ResourceInjector.STANDALONE;
        return ri;
    }
    
     /**
     * Wraps this {@link InstanceResolver} into an {@link Invoker}.
     */
	public  //TODO - make this package private.  Cannot do it until this method is removed from base
		//       class com.sun.xml.ws.api.server.InstanceResolver
     @NotNull Invoker createInvoker() {
        return new Invoker() {
            @Override
            public void start(@NotNull WSWebServiceContext wsc, @NotNull WSEndpoint endpoint) {
                InstanceResolverImpl.this.start(wsc,endpoint);
            }

            @Override
            public void dispose() {
                InstanceResolverImpl.this.dispose();
            }

            @Override
            public Object invoke(Packet p, Method m, Object... args) throws InvocationTargetException, IllegalAccessException {
                return m.invoke( resolve(p), args );
            }

            @Override
            public <T> T invokeProvider(@NotNull Packet p, T arg) {
                return ((Provider<T>)resolve(p)).invoke(arg);
            }

            public String toString() {
                return "Default Invoker over "+InstanceResolverImpl.this.toString();
            }
        };
    }


}