fr.mncc.gwttoolbox.rpc.client.requests.RestCall.java Source code

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Here is the source code for fr.mncc.gwttoolbox.rpc.client.requests.RestCall.java

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/**
 * Copyright (c) 2012 MNCC
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 * @author http://www.mncc.fr
 */
package fr.mncc.gwttoolbox.rpc.client.requests;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.Response;
import com.google.gwt.http.client.URL;
import com.google.gwt.jsonp.client.JsonpRequestBuilder;
import com.google.gwt.user.client.rpc.AsyncCallback;
import fr.mncc.gwttoolbox.primitives.client.JsonParser;

public class RestCall {

    /**
     * Send a request using the JSONP mechanism
     * 
     * @param url
     * @param callback on success, returns a GWT javascript object
     */
    public static <T extends JavaScriptObject> void retry(final String url, final AsyncCallback<T> callback) {
        final JsonpRequestBuilder rb = new JsonpRequestBuilder();
        rb.requestObject(url, new AsyncCallback<T>() {
            @Override
            public void onFailure(final Throwable caught) {
                if (callback != null)
                    callback.onFailure(caught);
            }

            @Override
            public void onSuccess(final T feed) {
                if (callback != null)
                    callback.onSuccess(feed);
            }
        });
    }

    /**
     * Send a restful POST request to a given URL Does not work cross-domain
     * 
     * @param url
     * @param data
     * @param callback on success, returns a GWT JSON object
     */
    public static <T extends JavaScriptObject> void retryPost(final String url, final String data,
            final AsyncCallback<T> callback) {
        sendRequest(RequestBuilder.POST, url, data, callback);
    }

    /**
     * Send a restful GET request to a given URL Does not work cross-domain
     * 
     * @param url
     * @param data
     * @param callback on success, returns a GWT JSON object
     */
    public static <T extends JavaScriptObject> void retryGet(final String url, final String data,
            final AsyncCallback<T> callback) {
        sendRequest(RequestBuilder.GET, url, data, callback);
    }

    private static <T extends JavaScriptObject> void sendRequest(final RequestBuilder.Method method,
            final String url, final String data, final AsyncCallback<T> callback) {
        try {
            final RequestBuilder rb = new RequestBuilder(method, URL.encode(url));
            rb.setHeader("Accept", "application/json");
            rb.sendRequest(data, new RequestCallback() {
                @Override
                public void onError(final com.google.gwt.http.client.Request request, final Throwable exception) {
                    if (callback != null)
                        callback.onFailure(exception);
                }

                @Override
                public void onResponseReceived(final com.google.gwt.http.client.Request request,
                        final Response response) {
                    if (response.getStatusCode() != Response.SC_OK) {
                        if (callback != null)
                            callback.onFailure(
                                    new Exception("response.getStatusCode() = " + response.getStatusCode()));
                    } else {
                        final JsonParser<T> parser = new JsonParser<T>();
                        if (callback != null)
                            callback.onSuccess(parser.fromJson(response.getText()));
                    }
                }
            });
        } catch (final Exception exception) {
            if (callback != null)
                callback.onFailure(exception);
        }
    }
}