Synnefo

/*

 * Copyright 2011 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 */

package gr.grnet.pithos.web.client.rest;

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

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

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

public abstract class RestCallback  implements RequestCallback {

        private static final int HTTP_OK = 200;

        private String path;

        private int okcode = -1;

        public RestCallback(String aPath) {

                path = aPath;

        }

        public RestCallback(String aPath, int okCode) {

                path = aPath;

                okcode = okCode;

        }

        @Override

        public void onError(Request request, Throwable exception) {

                handleError(request, exception);

        }

        @Override

        public void onResponseReceived(Request request, Response response) {

                try {

                        if (okcode == -1 && response.getStatusCode() == HTTP_OK)

                                handleSuccess(deserialize(response));

                        //this one is only used for trash handling where empty trash has 201 status code

                        else if(okcode !=-1 && (response.getStatusCode() == okcode || response.getStatusCode() == HTTP_OK))

                                handleSuccess(deserialize(response));

                        else if(response.getStatusCode() == 403)

                                RestCommand.sessionExpired();

                        else {

                                String statusText = "";

                                String text = "";

                                // Ignore JavaScript errors caused by non-existent text.

                                try {

                                        statusText = response.getStatusText();

                                } catch (Exception e) {        }

                                try {

                                        text = response.getText();

                                } catch (Exception e) {        }

                                handleError(request, new RestException(path, response.getStatusCode(), statusText, text));

                        }

                } catch (Exception e) {

                        handleError(request,e);

                }

        }

        public abstract void handleSuccess(Object object);

        public abstract void handleError(Request request, Throwable exception);

        public abstract Object deserialize(Response response);

}