org.eclipse.che.ide.devmode.DevModeScriptInjector.java Source code

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Here is the source code for org.eclipse.che.ide.devmode.DevModeScriptInjector.java

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/*
 * Copyright (c) 2012-2018 Red Hat, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Red Hat, Inc. - initial API and implementation
 */
package org.eclipse.che.ide.devmode;

import com.google.gwt.core.client.Callback;
import com.google.gwt.core.client.ScriptInjector;
import elemental.js.JsBrowser;
import javax.inject.Singleton;
import org.eclipse.che.api.promises.client.Promise;
import org.eclipse.che.api.promises.client.callback.CallbackPromiseHelper;

/** Allows to inject JavaScript for enabling Super DevMode on a host page. */
@Singleton
class DevModeScriptInjector {

    private static final String DEV_MODE_SCRIPT_NAME = "dev_mode_on.js";

    private static Callback<Void, Exception> getScriptInjectionCallback(Callback<Void, Throwable> promiseCallback) {

        return new Callback<Void, Exception>() {
            @Override
            public void onSuccess(Void result) {
                promiseCallback.onSuccess(result);
            }

            @Override
            public void onFailure(Exception reason) {
                promiseCallback.onFailure(reason);
            }
        };
    }

    /**
     * Injects the JS script, that communicates with a Code Server, into a host page.
     *
     * @param url host URL where script is located. Usually should be a Code Server URL
     * @return promise that may be resolved if script has been injected successfully or rejected in
     *     case of any error while script injection
     */
    Promise<Void> inject(String url) {
        return CallbackPromiseHelper.createFromCallback(promiseCallback -> ScriptInjector
                .fromUrl(url + DEV_MODE_SCRIPT_NAME).setWindow(JsBrowser.getWindow())
                .setCallback(getScriptInjectionCallback(promiseCallback)).inject());
    }
}