/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.wildfly.security;

import java.security.GeneralSecurityException;

/**
 * A {@link SecurityFactory} implementation which returns null every time.
 *
 * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
 */
public final class NullSecurityFactory<T> implements SecurityFactory<T> {

    static final NullSecurityFactory<Object> INSTANCE = new NullSecurityFactory<>();

    NullSecurityFactory() {
    }

    /**
     * Gets an instance of this singleton class.
     *
     * @param <T> the type of the security factory
     * @return the only instance of this factory
     */
    @SuppressWarnings("unchecked")
    public static <T> NullSecurityFactory<T> getInstance() {
        return (NullSecurityFactory<T>) INSTANCE;
    }

    @Override
    public T create() throws GeneralSecurityException {
        return null;
    }
}
