org.openremote.web.console.service.LocalDataServiceImpl.java Source code

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Here is the source code for org.openremote.web.console.service.LocalDataServiceImpl.java

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/* OpenRemote, the Home of the Digital Home.
* Copyright 2008-2012, OpenRemote Inc.
*
* See the contributors.txt file in the distribution for a
* full listing of individual contributors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.openremote.web.console.service;

import java.util.Date;

import org.openremote.web.console.controller.ControllerCredentials;
import org.openremote.web.console.controller.ControllerCredentialsList;
import org.openremote.web.console.event.ConsoleUnitEventManager;
import org.openremote.web.console.event.ui.BindingDataChangeEvent;

import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.storage.client.Storage;
import com.google.gwt.user.client.Cookies;

/**
 * 
 *  
 * @author <a href="mailto:richard@openremote.org">Richard Turner</a>
 */
public class LocalDataServiceImpl implements LocalDataService {
    private static LocalDataServiceImpl instance;
    private static final String PREFIX = "ConsoleUnit";
    private Storage dataStore = null;
    //   private StorageMap dataStoreMap = null;

    private LocalDataServiceImpl() {
        try {
            // Chrome throws exception here when cookies disabled even though it shouldn't
            dataStore = Storage.getLocalStorageIfSupported();
        } catch (Exception e) {
        }
    }

    public static synchronized LocalDataServiceImpl getInstance() {
        if (instance == null) {
            instance = new LocalDataServiceImpl();
            instance.initData();
        }
        return instance;
    }

    public boolean isAvailable() {
        return dataStore != null;
    }

    /*
     * Initialise each data item in the enumDataMap so the
     * AutoBean is correctly generated when requested
     */
    private void initData() {
        for (EnumDataMap map : EnumDataMap.values()) {
            String data = getData(map.getDataName());
            if (map.getInitValue() != null && (data == null || data.equals(""))) {
                setData(map.getDataName(), map.getInitValue());
            }
        }
    }

    private static String buildPathString(String object) {
        return PREFIX + "." + object;
    }

    private void setData(String dataName, String data) {
        String oldData = getObjectString(dataName);
        if (oldData == null || !data.equals(oldData)) {
            String dataNamePath = buildPathString(dataName);
            try {
                if (dataStore != null) {
                    dataStore.removeItem(dataNamePath);
                    dataStore.setItem(dataNamePath, data);
                } else {
                    Cookies.setCookie(dataNamePath, data,
                            new Date(new Date().getTime() + (1000 * 60 * 60 * 24 * 365 * 100)));
                }
            } catch (Exception e) {
            }
            HandlerManager eventBus = ConsoleUnitEventManager.getInstance().getEventBus();
            BindingDataChangeEvent event = new BindingDataChangeEvent(dataName);
            eventBus.fireEvent(event);
        }
    }

    private String getData(String dataName) {
        if (dataName == null || dataName.equals(""))
            return "";

        dataName = buildPathString(dataName);
        String data = null;
        try {
            if (dataStore != null) {
                data = dataStore.getItem(dataName);
            } else {
                data = Cookies.getCookie(dataName);
            }
        } catch (Exception e) {
        }

        if (data == null || data.equals("null")) {
            data = "";
        }
        return data;
    }

    @Override
    public void clearData(String dataName) {
        if (dataName == null || dataName.equals(""))
            return;

        dataName = buildPathString(dataName);
        try {
            if (dataStore != null) {
                dataStore.removeItem(dataName);
            } else {
                Cookies.removeCookie(dataName);
            }
        } catch (Exception e) {
        }
        initData();
    }

    @Override
    public void clearAllData() {
        try {
            if (dataStore != null) {
                dataStore.clear();
            } else {
                // TODO: Clear out cookies
            }
        } catch (Exception e) {
        }
        initData();
    }

    @Override
    public ControllerCredentials getLastControllerCredentials() {
        ControllerCredentials credentials = null;
        EnumDataMap map = EnumDataMap.LAST_CONTROLLER_CREDENTIALS;
        String dataStr = getData(map.getDataName());
        if (dataStr != null && !dataStr.isEmpty()) {
            credentials = (ControllerCredentials) AutoBeanService.getInstance()
                    .fromJsonString(map.getClazz(), dataStr).as();
        }
        return credentials;
    }

    @Override
    public void setLastControllerCredentials(ControllerCredentials credentials) {
        EnumDataMap map = EnumDataMap.LAST_CONTROLLER_CREDENTIALS;
        if (credentials == null) {
            clearData(map.getDataName());
        } else {
            String data = AutoBeanService.getInstance().toJsonString(credentials);
            setData(map.getDataName(), data);
        }
    }

    @Override
    public ControllerCredentialsList getControllerCredentialsList() {
        ControllerCredentialsList credentialsList = null;
        EnumDataMap map = EnumDataMap.CONTROLLER_CREDENTIALS_LIST;
        String dataStr = getData(map.getDataName());
        if (dataStr != null && !dataStr.isEmpty()) {
            credentialsList = (ControllerCredentialsList) AutoBeanService.getInstance()
                    .fromJsonString(map.getClazz(), dataStr).as();
        }
        return credentialsList;
    }

    @Override
    public void setControllerCredentialsList(ControllerCredentialsList credentialsList) {
        EnumDataMap map = EnumDataMap.CONTROLLER_CREDENTIALS_LIST;
        if (credentialsList == null) {
            clearData(map.getDataName());
        } else {
            String data = AutoBeanService.getInstance().toJsonString(credentialsList);
            setData(map.getDataName(), data);
        }
    }

    @Override
    public String getObjectString(String objName) {
        String obj = null;
        obj = getData(objName);
        if (obj != null && (obj.equals("") || obj.equals("{}")))
            obj = null;
        return obj;
    }

    @Override
    public void setObject(String objName, String obj) {
        setData(objName, obj);
    }
}