A6plus-Global
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A6plus-Global / trunk / GWT / gwt-2.5.0 / samples / MobileWebApp / src / main / java / com / google / gwt / sample / mobilewebapp / client / TaskProxyLocalStorage.java
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/* * Copyright 2011 Google Inc. * * 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.google.gwt.sample.mobilewebapp.client; import com.google.gwt.sample.mobilewebapp.shared.TaskProxy; import com.google.gwt.sample.mobilewebapp.shared.TaskProxyImpl; import com.google.gwt.storage.client.Storage; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; /** * Manages the storage and retrieval of local tasks. */ public class TaskProxyLocalStorage { private static final String TASKLIST_SAVE_KEY = "TASKLIST"; private static final String TASKSEP = "&&"; private static final String FIELDSEP = "@@"; private static final String FIELDEMPTY = "***"; /** * Convert a task proxy list into a string. */ private static String getStringFromTaskProxy(List<TaskProxy> list) { StringBuilder sb = new StringBuilder(); for (TaskProxy proxy : list) { sb.append(proxy.getDueDate() != null ? proxy.getDueDate().getTime() : FIELDEMPTY); sb.append(FIELDSEP); sb.append(proxy.getId() != null ? proxy.getId() : ""); sb.append(FIELDSEP); String name = proxy.getName(); sb.append(name != null && name.length() > 0 ? proxy.getName() : FIELDEMPTY); sb.append(FIELDSEP); String notes = proxy.getNotes(); sb.append(notes != null && notes.length() > 0 ? proxy.getNotes() : FIELDEMPTY); sb.append(TASKSEP); } return sb.toString(); } /** * Parse a task proxy list from a string. */ private static List<TaskProxy> getTaskProxyFromString(String taskProxyList) { ArrayList<TaskProxy> list = new ArrayList<TaskProxy>(0); if (taskProxyList == null) { return list; } // taskproxy1&&taskproxy2&&taskproxy3&&... String taskProxyStrings[] = taskProxyList.split(TASKSEP); for (String taskProxyString : taskProxyStrings) { if (taskProxyString == null) { continue; } // date@@id@@name@@notes String taskProxyStringData[] = taskProxyString.split(FIELDSEP); if (taskProxyStringData.length >= 4) { // collect the fields String dateString = taskProxyStringData[0]; String idString = taskProxyStringData[1]; String nameString = taskProxyStringData[2]; if (FIELDEMPTY.equals(nameString)) { nameString = null; } String notesString = taskProxyStringData[3]; if (FIELDEMPTY.equals(notesString)) { notesString = null; } // parse the numerical fields Date dueDate = null; try { dueDate = new Date(Long.parseLong(dateString)); } catch (NumberFormatException nfe) { } Long idLong = 0L; try { idLong = Long.parseLong(idString); } catch (NumberFormatException nfe) { } // create and populate the TaskProxy TaskProxyImpl taskProxy = new TaskProxyImpl(); taskProxy.setDueDate(dueDate); taskProxy.setId(idLong); taskProxy.setName(nameString); taskProxy.setNotes(notesString); list.add(taskProxy); } } return list; } private final Storage storage; private List<TaskProxy> tasks; private Map<Long, TaskProxy> taskMap; public TaskProxyLocalStorage(Storage storage) { this.storage = storage; } /** * Get a task by its ID. * * @param id the task id * @return the task, or null if it isn't in local storage */ public TaskProxy getTask(Long id) { // Create the map of tasks. if (taskMap == null) { taskMap = new HashMap<Long, TaskProxy>(); for (TaskProxy task : getTasks()) { taskMap.put(task.getId(), task); } } return taskMap.get(id); } /** * Get a list of all tasks in local storage. */ public List<TaskProxy> getTasks() { if (tasks == null) { // Load the saved task list from storage if (storage != null) { // if storage is supported String taskString = storage.getItem(TASKLIST_SAVE_KEY); tasks = getTaskProxyFromString(taskString); } else { tasks = new ArrayList<TaskProxy>(); } } return tasks; } /** * Save a list of tasks to local storage. */ public void setTasks(List<TaskProxy> tasks) { this.tasks = tasks; // Save the response to storage if (storage != null) { // if storage is supported String responseString = getStringFromTaskProxy(tasks); storage.setItem(TASKLIST_SAVE_KEY, responseString); } } } |