org.clevermore.monitor.client.utils.LocalStorage.java Source code

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Here is the source code for org.clevermore.monitor.client.utils.LocalStorage.java

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/**
 * Copyright (C) 2013 Arman Gal
 *
 * 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 org.clevermore.monitor.client.utils;

import java.util.Date;

import com.allen_sauer.gwt.log.client.Log;
import com.google.gwt.storage.client.Storage;
import com.google.gwt.user.client.Cookies;

/**
 * A helper class that will try to persist data to local storage if supported, if not, then cookies are used.
 * 
 * @author armang
 */
public class LocalStorage {

    public static String readStoredItem(final String key) {
        if (Storage.isSupported()) {
            String item = Storage.getLocalStorageIfSupported().getItem(key);
            item = item == null ? "" : item;
            Log.debug("Returning value:" + item + ", from local storage with key:" + key);
            return item;
        } else {
            // get from cookies
            String cookie = Cookies.getCookie(key);
            Log.debug("Returning value:" + cookie + ", from cookie with key:" + key);
            return cookie;
        }
    }

    public static void storeItem(final String key, final String value) {
        if (Storage.isSupported()) {
            Log.debug("Storing value:" + value + ", with key:" + key + ", to local storage");
            Storage.getLocalStorageIfSupported().setItem(key, value);
        } else {
            // store to cookies
            Log.debug("Storing value:" + value + ", with key:" + key + ", to cookie");
            Cookies.setCookie(key, value, new Date(Long.MAX_VALUE));
        }
    }

    public static void removeItem(final String key) {
        if (Storage.isSupported()) {
            Log.debug("Removing key:" + key + ", from local storage");
            Storage.getLocalStorageIfSupported().removeItem(key);
        } else {
            // store to cookies
            Log.debug("Removing key:" + key + ", from cookies");
            Cookies.removeCookie(key);
        }
    }
}