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package edu.stanford.protege.webprotege.dispatch.impl;

import edu.stanford.protege.webprotege.common.Request;
import edu.stanford.protege.webprotege.common.Response;
import edu.stanford.protege.webprotege.dispatch.*;

import javax.annotation.Nonnull;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Author: Matthew Horridge

 * Stanford University

 * Bio-Medical Informatics Research Group

 * Date: 20/01/2013
 */
public abstract class ActionHandlerRegistryImpl implements ActionHandlerRegistry {

    // NOT a concurrent map.  This is only written to in the constructor. At runtime it's essentially immutable and the
    // basic maps are safe for multiple readers
    private final Map, ActionHandler> registry = new HashMap<>();

    public ActionHandlerRegistryImpl(Set handlers) {
        for(ActionHandler actionHandler : handlers) {
            register(actionHandler);
        }
    }


    private  , R extends Response> void register(ActionHandler handler) {
        registry.put(handler.getActionClass(), handler);
    }

    @Nonnull
    @Override
    @SuppressWarnings("unchecked")
    public , R extends Response> ActionHandler getActionHandler(A action) {
        checkNotNull(action, "action must not be null");
        ActionHandler handler = (ActionHandler) registry.get(action.getClass());
        if(handler == null) {
            handler = (ActionHandler) registry.get(action.getClass().getSuperclass());
            if (handler == null) {
                throw new ActionHandlerNotFoundException(action);
            }
        }
        return handler;
    }
}