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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 com.ofcoder.klein.spi;

import java.util.Optional;

/**
 * SpiExtensionFactory.
 */
@Join
public class SpiExtensionFactory implements ExtensionFactory {

    @Override
    public  T getExtension(final String key, final Class clazz) {
        return Optional.ofNullable(clazz)
                .filter(Class::isInterface)
                .filter(cls -> cls.isAnnotationPresent(SPI.class))
                .map(ExtensionLoader::getExtensionLoader)
                .map(ExtensionLoader::getDefaultJoin)
                .orElse(null);
    }
}