org.pentaho.mantle.client.usersettings.UserSettingsManager.java Source code

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Here is the source code for org.pentaho.mantle.client.usersettings.UserSettingsManager.java

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/*!
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
 */

package org.pentaho.mantle.client.usersettings;

import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.JsArray;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;
import com.google.gwt.user.client.rpc.AsyncCallback;
import org.pentaho.gwt.widgets.client.dialogs.MessageDialogBox;
import org.pentaho.mantle.client.events.EventBusUtil;
import org.pentaho.mantle.client.events.UserSettingsLoadedEvent;
import org.pentaho.mantle.client.messages.Messages;

public class UserSettingsManager {

    private JsArray<JsSetting> settings;
    private static UserSettingsManager instance;

    private UserSettingsManager() {
    }

    public static UserSettingsManager getInstance() {
        if (instance == null) {
            instance = new UserSettingsManager();
        }
        return instance;
    }

    public void getUserSettings(final boolean forceReload) {
        if (forceReload || settings == null) {
            getUserSettings(null);
        }
    }

    public void getUserSettings(final AsyncCallback<JsArray<JsSetting>> callback, final boolean forceReload) {
        if (forceReload || settings == null) {
            getUserSettings(callback);
        } else {
            callback.onSuccess(settings);
        }
    }

    private void getUserSettings(final AsyncCallback<JsArray<JsSetting>> callback) {
        final String url = GWT.getHostPageBaseURL() + "api/user-settings/list"; //$NON-NLS-1$
        RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);
        builder.setHeader("accept", "application/json");
        builder.setHeader("If-Modified-Since", "01 Jan 1970 00:00:00 GMT");

        try {
            builder.sendRequest(null, new RequestCallback() {

                public void onError(Request request, Throwable exception) {
                    MessageDialogBox dialog = new MessageDialogBox(Messages.getString("error"), //$NON-NLS-1$
                            Messages.getString("couldNotGetUserSettings"), true, false, true); //$NON-NLS-1$
                    dialog.center();
                }

                public void onResponseReceived(Request request, Response response) {
                    JsArray<JsSetting> jsSettings = null;
                    try {
                        jsSettings = JsSetting.parseSettingsJson(response.getText());
                    } catch (Throwable t) {
                        // happens when there are no settings
                    }
                    //CHECKSTYLE IGNORE Indentation FOR NEXT 1 LINES
                    getInstance().settings = jsSettings;
                    if (callback != null) {
                        callback.onSuccess(settings);
                    }
                    EventBusUtil.EVENT_BUS.fireEvent(new UserSettingsLoadedEvent(settings));
                }

            });
        } catch (RequestException e) {
            // showError(e);
        }

    }

}