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/**
 * Copyright 2019 Pramati Prism, Inc.
 *
 * 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 io.hyscale.deployer.services.factory;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.ServiceLoader;
import java.util.stream.Collectors;

import io.hyscale.deployer.services.handler.PodParentHandler;

/**
 * Factory Class to provide PodParentHandlers based on Kind
 *
 */
public class PodParentFactory {
    
    private PodParentFactory() {}

    private static Map kindVsHandlerMap;


    public static void registerHandlers() {
        if (kindVsHandlerMap == null) {
            kindVsHandlerMap = new HashMap<>();
            for (PodParentHandler handler : ServiceLoader.load(PodParentHandler.class, PodParentFactory.class.getClassLoader())) {
                kindVsHandlerMap.put(handler.getKind(), handler);
            }
        }
    }

    public static PodParentHandler getHandler(String kind) {
        return kindVsHandlerMap.get(kind);
    }
    
    /**
     * 
     * @return Unmodifiable list of all available PodParentHandlers
     */
    public static List getAllHandlers(){
        if (kindVsHandlerMap == null) {
        return Collections.emptyList();
        }
        return Collections.unmodifiableList(kindVsHandlerMap.values().stream().collect(Collectors.toList()));
    }

}