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/**
 * Copyright 2013 ArcBees 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 com.gwtplatform.dispatch.rpc.client;

import com.google.gwt.user.client.rpc.AsyncCallback;
import com.gwtplatform.common.client.IndirectProvider;
import com.gwtplatform.dispatch.client.DelegatingDispatchRequest;
import com.gwtplatform.dispatch.client.DispatchCall;
import com.gwtplatform.dispatch.client.ExceptionHandler;
import com.gwtplatform.dispatch.client.GwtHttpDispatchRequest;
import com.gwtplatform.dispatch.client.OldDelegatingAsyncCallback;
import com.gwtplatform.dispatch.client.actionhandler.ClientActionHandler;
import com.gwtplatform.dispatch.client.actionhandler.ClientActionHandlerRegistry;
import com.gwtplatform.dispatch.rpc.client.interceptor.RpcInterceptedAsyncCallback;
import com.gwtplatform.dispatch.rpc.client.interceptor.RpcInterceptor;
import com.gwtplatform.dispatch.rpc.client.interceptor.RpcInterceptorRegistry;
import com.gwtplatform.dispatch.rpc.shared.Action;
import com.gwtplatform.dispatch.rpc.shared.DispatchServiceAsync;
import com.gwtplatform.dispatch.rpc.shared.Result;
import com.gwtplatform.dispatch.shared.DispatchRequest;
import com.gwtplatform.dispatch.shared.SecurityCookieAccessor;

/**
 * A class representing an execute call to be sent to the server using RPC.
 *
 * @param  the {@link Action} type.
 * @param  the {@link Result} type for this action.
 */
public class RpcDispatchExecuteCall, R extends Result> extends DispatchCall {
    private final DispatchServiceAsync dispatchService;
    private final RpcDispatchHooks dispatchHooks;
    private final RpcInterceptorRegistry interceptorRegistry;
    private final ClientActionHandlerRegistry clientActionHandlerRegistry;

    RpcDispatchExecuteCall(
            DispatchServiceAsync dispatchService,
            ExceptionHandler exceptionHandler,
            ClientActionHandlerRegistry clientActionHandlerRegistry,
            RpcInterceptorRegistry interceptorRegistry,
            SecurityCookieAccessor securityCookieAccessor,
            RpcDispatchHooks dispatchHooks,
            A action,
            AsyncCallback callback) {
        super(exceptionHandler, securityCookieAccessor, action, callback);

        this.dispatchService = dispatchService;
        this.dispatchHooks = dispatchHooks;
        this.interceptorRegistry = interceptorRegistry;
        this.clientActionHandlerRegistry = clientActionHandlerRegistry;
    }

    @Override
    public DispatchRequest execute() {
        A action = getAction();
        dispatchHooks.onExecute(action, false);

        IndirectProvider> interceptorIndirectProvider = interceptorRegistry.find(action);

        if (interceptorIndirectProvider != null) {
            DelegatingDispatchRequest dispatchRequest = new DelegatingDispatchRequest();
            RpcInterceptedAsyncCallback delegatingCallback = new RpcInterceptedAsyncCallback(
                    this, action, getCallback(), dispatchRequest);

            interceptorIndirectProvider.get(delegatingCallback);

            return dispatchRequest;
        } else {
            // Maintaining support for client action handlers
            DispatchRequest dispatchRequest = findClientActionHandlerRequest();
            if (dispatchRequest == null) {
                return processCall();
            } else {
                return dispatchRequest;
            }
        }
    }

    @Override
    protected DispatchRequest processCall() {
        return new GwtHttpDispatchRequest(dispatchService.execute(getSecurityCookie(), getAction(),
                new AsyncCallback() {
                    public void onFailure(Throwable caught) {
                        RpcDispatchExecuteCall.this.onExecuteFailure(caught);

                        dispatchHooks.onFailure(getAction(), caught, false);
                    }

                    public void onSuccess(R result) {
                        RpcDispatchExecuteCall.this.onExecuteSuccess(result);

                        dispatchHooks.onSuccess(getAction(), result, false);
                    }
                }
        ));
    }

    @Deprecated
    private DispatchRequest findClientActionHandlerRequest() {
        DispatchRequest request = null;

        A action = getAction();
        IndirectProvider> clientActionHandlerProvider =
                clientActionHandlerRegistry.find(action.getClass());

        if (clientActionHandlerProvider != null) {
            DelegatingDispatchRequest dispatchRequest = new DelegatingDispatchRequest();
            OldDelegatingAsyncCallback delegatingCallback =
                    new OldDelegatingAsyncCallback(this, action, getCallback(), dispatchRequest);

            clientActionHandlerProvider.get(delegatingCallback);

            request = dispatchRequest;
        }
        return request;
    }
}
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