org.gwt4e.sema4g.client.commands.proxies.RequestCallbackProxy.java Source code

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Here is the source code for org.gwt4e.sema4g.client.commands.proxies.RequestCallbackProxy.java

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/*
 * Copyright 2015 Frank Hossfeld
 *
 * 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 org.gwt4e.sema4g.client.commands.proxies;

import org.gwt4e.sema4g.client.commands.AsyncCommand;

import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.Response;

/**
 * <p>Add support for RequestCallback in GWT {@link RequestCallback}</p>
 * <br /><br />
 * <p>If you are using SeMa4g, you have to this RequestCallbackProxy
 * class instead of the RequestCallback. Otherwise SeMa4g will not work.</p>
 */
public abstract class RequestCallbackProxy implements SeMa4gProxy, RequestCallback {

    /* execution command of this proxy */
    private AsyncCommand command;

    public RequestCallbackProxy(AsyncCommand command) {
        super();
        this.command = command;
    }

    @Override
    public void onResponseReceived(Request request, Response response) {
        // Set State
        command.setStateFinish();
        // do the default handling
        onProxyResponseReceived(request, response);
        // do the SeMa4g handling
        command.trigger();
    }

    @Override
    public void onError(Request request, Throwable exception) {
        // Set State
        command.setStateError();
        // do the default handling
        onProxyError(request, exception);
        // do the SeMa4g handling
        command.failure(exception);
    }

    protected abstract void onProxyError(Request request, Throwable exception);

    protected abstract void onProxyResponseReceived(Request request, Response response);
}