/*

 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.tracing;

import java.lang.reflect.Method;

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);

        provider.init();

        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) {

    }

}