com.cgxlib.xq.client.plugins.deferred.PromiseReqBuilderJSONP.java Source code

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Here is the source code for com.cgxlib.xq.client.plugins.deferred.PromiseReqBuilderJSONP.java

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/*
 * Copyright 2013, The gwtquery team.
 *
 * 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 com.cgxlib.xq.client.plugins.deferred;

/*
 * #%L
 * CGXlib
 * %%
 * Copyright (C) 2016 CGXlib (http://www.cgxlib.com)
 * %%
 * 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.
 * #L%
  Code is originally from gwtquery, and modified by CGXlib team.
 */

import com.cgxlib.xq.client.plugins.deferred.Deferred.DeferredPromiseImpl;
import com.google.gwt.jsonp.client.JsonpRequestBuilder;
import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;
import com.google.gwt.user.client.rpc.AsyncCallback;

/**
 * Utility class used to create promises for JsonpRequestBuilder.
 * <pre>
 *    Promise p = new PromiseJsonpReqBuilder(url, 4000);
 *
 *    p.done(new Function() {
 *      public void f() {
 *        Properties p = arguments(0);
 *      }
 *    }).fail(new Function() {
 *      public void f() {
 *        Throwable error = arguments(0);
 *      }
 *    });
 * </pre>
 */
public class PromiseReqBuilderJSONP extends DeferredPromiseImpl {

    private static final RegExp callbackRegex = RegExp.compile("^(.+[\\?&])([^=]+)=\\?(.*)$");

    public PromiseReqBuilderJSONP(String url) {
        this(url, null, 0);
    }

    public PromiseReqBuilderJSONP(String url, int timeout) {
        this(url, null, timeout);
    }

    public PromiseReqBuilderJSONP(String url, String callbackParam, int timeout) {
        JsonpRequestBuilder builder = new JsonpRequestBuilder();
        if (timeout > 0) {
            builder.setTimeout(timeout);
        }
        // jQuery allows a parameter callback=? to figure out the callback parameter
        if (callbackParam == null) {
            MatchResult tmp = callbackRegex.exec(url);
            if (tmp != null && tmp.getGroupCount() == 4) {
                callbackParam = tmp.getGroup(2);
                url = tmp.getGroup(1) + tmp.getGroup(3);
            }
        }
        if (callbackParam != null) {
            builder.setCallbackParam(callbackParam);
        }
        send(builder, url, new AsyncCallback<Object>() {
            public void onFailure(Throwable caught) {
                dfd.reject(caught);
            }

            public void onSuccess(Object result) {
                dfd.resolve(result);
            }
        });
    }

    // Using jsni because method send in JsonpRequestBuilder is private
    private native void send(JsonpRequestBuilder bld, String url, AsyncCallback<?> cb) /*-{
                                                                                       bld.@com.google.gwt.jsonp.client.JsonpRequestBuilder::send(Ljava/lang/String;Lcom/google/gwt/user/client/rpc/AsyncCallback;Z)(url, cb, false);
                                                                                       }-*/;
}