210 lines
3.8 KiB
JavaScript
210 lines
3.8 KiB
JavaScript
/*
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Jappix - An open social platform
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These are the temporary/persistent data store functions
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-------------------------------------------------
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License: AGPL
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Author: Vanaryon
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Last revision: 23/06/11
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*/
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// Temporary: returns whether it is available or not
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function hasDB() {
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if(window.sessionStorage)
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return true;
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return false;
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}
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// Temporary: used to read a database entry
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function getDB(type, id) {
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try {
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return sessionStorage.getItem(type + '_' + id);
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}
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catch(e) {
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logThis('Error while getting a temporary database entry (' + type + ' -> ' + id + '): ' + e, 1);
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return null;
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}
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}
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// Temporary: used to update a database entry
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function setDB(type, id, value) {
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try {
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sessionStorage.setItem(type + '_' + id, value);
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return true;
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}
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catch(e) {
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logThis('Error while writing a temporary database entry (' + type + ' -> ' + id + '): ' + e, 1);
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return false;
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}
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}
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// Temporary: used to remove a database entry
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function removeDB(type, id) {
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try {
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sessionStorage.removeItem(type + '_' + id);
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return true;
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}
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catch(e) {
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logThis('Error while removing a temporary database entry (' + type + ' -> ' + id + '): ' + e, 1);
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return false;
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}
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}
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// Temporary: used to check a database entry exists
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function existDB(type, id) {
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var read = getDB(type, id);
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if(read != null)
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return true;
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return false;
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}
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// Temporary: used to clear all the database
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function resetDB() {
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try {
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sessionStorage.clear();
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logThis('Temporary database cleared.', 3);
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return true;
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}
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catch(e) {
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logThis('Error while clearing temporary database: ' + e, 1);
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return false;
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}
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}
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// Persistent: returns whether it is available or not
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function hasPersistent() {
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if(window.localStorage)
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return true;
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return false;
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}
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// Persistent: used to read a database entry
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function getPersistent(type, id) {
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try {
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return localStorage.getItem(type + '_' + id);
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}
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catch(e) {
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logThis('Error while getting a persistent database entry (' + type + ' -> ' + id + '): ' + e, 1);
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return null;
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}
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}
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// Persistent: used to update a database entry
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function setPersistent(type, id, value) {
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try {
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localStorage.setItem(type + '_' + id, value);
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return true;
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}
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// Database might be full
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catch(e) {
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logThis('Retrying: could not write a persistent database entry (' + type + ' -> ' + id + '): ' + e, 2);
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// Flush it!
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flushPersistent();
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// Set the item again
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try {
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localStorage.setItem(type + '_' + id, value);
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return true;
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}
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// New error!
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catch(e) {
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logThis('Aborted: error while writing a persistent database entry (' + type + ' -> ' + id + '): ' + e, 1);
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return false;
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}
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}
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}
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// Persistent: used to remove a database entry
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function removePersistent(type, id) {
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try {
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localStorage.removeItem(type + '_' + id);
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return true;
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}
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catch(e) {
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logThis('Error while removing a persistent database entry (' + type + ' -> ' + id + '): ' + e, 1);
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return false;
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}
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}
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// Persistent: used to check a database entry exists
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function existPersistent(type, id) {
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var read = getPersistent(type, id);
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if(read != null)
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return true;
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return false;
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}
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// Persistent: used to clear all the database
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function resetPersistent() {
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try {
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localStorage.clear();
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logThis('Persistent database cleared.', 3);
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return true;
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}
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catch(e) {
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logThis('Error while clearing persistent database: ' + e, 1);
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return false;
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}
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}
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// Persistent: used to flush the database
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function flushPersistent() {
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try {
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// Get the stored session entry
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var session = getPersistent('session', 1);
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// Clear the persistent database
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localStorage.clear();
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// Restaure the stored session entry
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if(session)
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setPersistent('session', 1, session);
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logThis('Persistent database flushed.', 3);
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return true;
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}
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catch(e) {
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logThis('Error while flushing persistent database: ' + e, 1);
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return false;
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}
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}
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