Synnefo » Pithos

/*

 * Copyright (c) 2011 Greek Research and Technology Network

 */

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 {

                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);

}