Synnefo » Pithos Web Client

/*

 * Copyright 2011-2012 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;

import gr.grnet.pithos.web.client.foldertree.Resource;

public abstract class RestRequestCallback<T extends Resource> implements RequestCallback {

    private static final int HTTP_OK = 200;

    private int okcode = -1;

    private String path;

    public RestRequestCallback(String path, int okCode) {

        this.path = path;

        this.okcode = okCode;

    }

    public RestRequestCallback(String path) {

        this(path, -1);

    }

    @Override

    public void onResponseReceived(Request request, Response response) {

        try {

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

                onSuccess(deserialize(response));

            else if (response.getStatusCode() == Response.SC_UNAUTHORIZED)

                    onUnauthorized(response);

            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) {}

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

            }

        } catch (Exception e) {

            onError(request, e);

        }

    }

    public abstract void onSuccess(T result);

    public abstract T deserialize(Response response);

    public abstract void onUnauthorized(Response response);

}