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/*
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 *
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 *
 * The contents of this file are subject to the terms of either the GNU
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at packager/legal/LICENSE.txt.
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package com.sun.enterprise.admin.util.cache;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;
import org.jvnet.hk2.annotations.Service;

/** Tooling for AdminCache {@link DataProvider} implementation.
 *
 * @author mmares
 */
@Service
public class AdminCacheUtils {
    
    private static final AdminCacheUtils instance = new AdminCacheUtils();
    
    private final Map providers = new HashMap();
    private final Pattern keyPattern = Pattern.compile("([-_.a-zA-Z0-9]+/?)+");
    //private final ServiceLoader dataProviderLoader = ServiceLoader.load(DataProvider.class);
    
    private static final DataProvider[] allProviders = new DataProvider[]{
        new StringDataProvider(), 
        new ByteArrayDataProvider(),
        new CommandModelDataProvider()
    };
    
    private AdminCacheUtils() {
    }
    
    public DataProvider getProvider(final Class clazz) {
        DataProvider result = providers.get(clazz);
        if (result == null) {
            //Use hardcoded data providers - fastest and not problematic
            for (DataProvider provider : allProviders) {
                if (provider.accept(clazz)) {
                    providers.put(clazz, provider);
                    return provider;
                }
            }
//            ServiceLocator habitat = Globals.getDefaultHabitat();
//            if (habitat != null) {
//                List allServices = habitat.getAllServices(DataProvider.class);
//                for (DataProvider provider : allServices) {
//                    if (provider.accept(clazz)) {
//                        providers.put(clazz, provider);
//                        return provider;
//                    }
//                }
//            }
//            for (DataProvider provider : dataProviderLoader) {
//                if (provider.accept(clazz)) {
//                    providers.put(clazz, provider);
//                    return provider;
//                }
//            }
            
            return null;
        } else {
            return result;
        }
    }
    
    public final boolean validateKey(final String key) {
        return keyPattern.matcher(key).matches();
    }
    
    /** Return preferred {@link AdminCache}
     */
    public static AdminCache getCache() {
        return AdminCacheMemStore.getInstance();
    }
    
    public static AdminCacheUtils getInstance() {
        return instance;
    }
    
}