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package org.directwebremoting.datasync;

import java.util.HashMap;
import java.util.Map;

/**
 * A way to find {@link StoreProvider}s that people wish to expose to the
 * outside world.
 * Warning. This API may well get wrapped in a Factory like the other DWR
 * services.
 * TODO: decide if we want to wrap this
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class Directory
{
    /**
     * Register a StoreProvider for access by the outside world
     * @param storeId The id by which the store can be reached
     * @param provider The store provider that holds the Map of data
     */
    public static void register(String storeId, StoreProvider provider)
    {
        providers.put(storeId, provider);
    }

    /**
     * Remove the registration of a StoreProvider
     * @param storeId The id by which the store can be reached
     */
    public static void unregister(String storeId)
    {
        providers.remove(storeId);
    }

    /**
     * Look up the StoreProvider by ID.
     * @param  ...
     * @param storeId The id by which the store can be reached
     * @param type ...
     * @return The found StoreProvider or null if one is not found.
     */
    @SuppressWarnings("unchecked")
    public static  StoreProvider getRegistration(String storeId, @SuppressWarnings("unused") Class type)
    {
        return (StoreProvider) providers.get(storeId);
    }

    /**
     * Internal map of stores
     */
    private static Map> providers = new HashMap>();
}