com.github.jdramaix.client.ConverterApp.java Source code

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Here is the source code for com.github.jdramaix.client.ConverterApp.java

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/**
 * Copyright 2015 gwtproject.
 *
 * 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.github.jdramaix.client;

import static com.google.gwt.query.client.GQuery.$;
import static com.google.gwt.query.client.GQuery.console;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.query.client.Function;
import com.google.gwt.query.client.Properties;
import com.google.gwt.query.client.js.JsUtils;
import com.google.gwt.user.client.Window;

import com.github.jdramaix.client.fileapi.Blob;
import com.github.jdramaix.client.fileapi.Callback;
import com.github.jdramaix.client.fileapi.FormData;
import com.github.jdramaix.client.fileapi.XMLHttpRequest;

public class ConverterApp implements EntryPoint {
    private String uploadUrl;

    @Override
    public void onModuleLoad() {
        uploadUrl = readInitialUploadUrl();

        // listen on the convert button
        $("#convert").click(new Function() {
            @Override
            public void f() {
                startConversion();
            }
        });
    }

    private void startConversion() {
        displayAnswer("Conversion in progress...");

        convert($("#cssContent").val());
    }

    private void convert(String value) {
        Blob blob = createCssBlob(value);

        FormData formData = createFormData();
        formData.append("content", blob);

        final XMLHttpRequest xhr = createXmlHttpRequest();

        xhr.open("POST", uploadUrl);

        xhr.setOnreadystatechange(new Callback() {
            @Override
            public void apply() {
                onreadystatechange(xhr);
            }
        });

        xhr.send(formData);
    }

    private void onreadystatechange(XMLHttpRequest xhr) {
        if (xhr.getReadyState() == 4) {
            Properties json = JsUtils.parseJSON(xhr.getResponseText());
            if (xhr.getStatus() == 200) {
                displayAnswer(json.getStr("result"));
                console.log("Logs form server: \n" + json.getStr("logs"));
            } else {
                Window.alert("Ooops something went wrong... Please try again!");
                console.log(json.getStr("result"));
            }

            uploadUrl = json.getStr("nextUrl");
        }
    }

    private void displayAnswer(String response) {
        $("#resultContent").val(response);
    }

    private native Blob createCssBlob(String content) /*-{
                                                      return new Blob([content], {type: 'text/css'});
                                                      }-*/;

    private native FormData createFormData() /*-{
                                             return new FormData();
                                             }-*/;

    private native XMLHttpRequest createXmlHttpRequest() /*-{
                                                         return new XMLHttpRequest();
                                                         }-*/;

    private native String readInitialUploadUrl() /*-{
                                                 return $wnd.__GLOBALS[0];
                                                 }-*/;
}