/*

 */

package sun.tracing;

import java.lang.reflect.Method;

import java.util.logging.Logger;

import com.sun.tracing.ProviderFactory;

import com.sun.tracing.Provider;

/**

 * Factory class to create tracing Providers.

 *

 * This factory will create tracing instances that do nothing.

 * It is used when no tracing is desired, but Provider instances still

 * must be generated so that tracing calls in the application continue to

 * run.

 *

 * @since 1.7

 */

public class NullProviderFactory extends ProviderFactory {

    /**

     * Creates and returns a Null provider.

     *

     * See comments at {@code ProviderSkeleton.createProvider()} for more

     * details.

     *

     * @return a provider whose probe trigger are no-ops.

     */

    public <T extends Provider> T createProvider(Class<T> cls) {

        NullProvider provider = new NullProvider(cls);

        try {

            provider.init();

        } catch (Exception e) {

            // Probably a permission problem (can't get declared members)

            Logger.getAnonymousLogger().warning(

                "Could not initialize tracing provider: " + e.getMessage());

        }

        return provider.newProxyInstance();

    }

}

class NullProvider extends ProviderSkeleton {

    NullProvider(Class<? extends Provider> type) {

        super(type);

    }

    protected ProbeSkeleton createProbe(Method m) {

        return new NullProbe(m.getParameterTypes());

    }

}

class NullProbe extends ProbeSkeleton {

    public NullProbe(Class<?>[] parameters) {

        super(parameters);

    }

    public boolean isEnabled() {

        return false;

    }

    public void uncheckedTrigger(Object[] args) {

    }

}