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Convert the ViewHistory to an ES6 class

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This commit is contained in:
Jonas Jenwald 2017-04-22 12:10:54 +02:00
parent 366277d180
commit 16b4132ebf
1 changed files with 66 additions and 72 deletions
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138
web/view_history.js
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@ -13,7 +13,7 @@
* limitations under the License. * limitations under the License.
*/ */
var DEFAULT_VIEW_HISTORY_CACHE_SIZE = 20; const DEFAULT_VIEW_HISTORY_CACHE_SIZE = 20;
/** /**
* View History - This is a utility for saving various view parameters for * View History - This is a utility for saving various view parameters for
@ -24,13 +24,12 @@ var DEFAULT_VIEW_HISTORY_CACHE_SIZE = 20;
* - FIREFOX or MOZCENTRAL - uses sessionStorage. * - FIREFOX or MOZCENTRAL - uses sessionStorage.
* - GENERIC or CHROME - uses localStorage, if it is available. * - GENERIC or CHROME - uses localStorage, if it is available.
*/ */
var ViewHistory = (function ViewHistoryClosure() { class ViewHistory {
function ViewHistory(fingerprint, cacheSize) { constructor(fingerprint, cacheSize = DEFAULT_VIEW_HISTORY_CACHE_SIZE) {
this.fingerprint = fingerprint; this.fingerprint = fingerprint;
this.cacheSize = cacheSize || DEFAULT_VIEW_HISTORY_CACHE_SIZE; this.cacheSize = cacheSize;
this.isInitializedPromiseResolved = false; this.isInitializedPromiseResolved = false;
this.initializedPromise = this.initializedPromise = this._readFromStorage().then((databaseStr) => {
this._readFromStorage().then(function (databaseStr) {
this.isInitializedPromiseResolved = true; this.isInitializedPromiseResolved = true;
var database = JSON.parse(databaseStr || '{}'); var database = JSON.parse(databaseStr || '{}');
@ -53,82 +52,77 @@ var ViewHistory = (function ViewHistoryClosure() {
} }
this.file = database.files[index]; this.file = database.files[index];
this.database = database; this.database = database;
}.bind(this)); });
} }
ViewHistory.prototype = { _writeToStorage() {
_writeToStorage: function ViewHistory_writeToStorage() { return new Promise((resolve) => {
return new Promise(function (resolve) { var databaseStr = JSON.stringify(this.database);
var databaseStr = JSON.stringify(this.database);
if (typeof PDFJSDev !== 'undefined' && if (typeof PDFJSDev !== 'undefined' &&
PDFJSDev.test('FIREFOX || MOZCENTRAL')) { PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
sessionStorage.setItem('pdfjs.history', databaseStr); sessionStorage.setItem('pdfjs.history', databaseStr);
} else { } else {
localStorage.setItem('pdfjs.history', databaseStr); localStorage.setItem('pdfjs.history', databaseStr);
} }
resolve(); resolve();
}.bind(this)); });
}, }
_readFromStorage: function ViewHistory_readFromStorage() { _readFromStorage() {
return new Promise(function (resolve) { return new Promise(function(resolve) {
if (typeof PDFJSDev !== 'undefined' && if (typeof PDFJSDev !== 'undefined' &&
PDFJSDev.test('FIREFOX || MOZCENTRAL')) { PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
resolve(sessionStorage.getItem('pdfjs.history')); resolve(sessionStorage.getItem('pdfjs.history'));
} else { } else {
var value = localStorage.getItem('pdfjs.history'); var value = localStorage.getItem('pdfjs.history');
// TODO: Remove this key-name conversion after a suitable time-frame. // TODO: Remove this key-name conversion after a suitable time-frame.
// Note that we only remove the old 'database' entry if it looks like // Note that we only remove the old 'database' entry if it looks like
// it was created by PDF.js. to avoid removing someone else's data. // it was created by PDF.js, to avoid removing someone else's data.
if (!value) { if (!value) {
var databaseStr = localStorage.getItem('database'); var databaseStr = localStorage.getItem('database');
if (databaseStr) { if (databaseStr) {
try { try {
var database = JSON.parse(databaseStr); var database = JSON.parse(databaseStr);
if (typeof database.files[0].fingerprint === 'string') { if (typeof database.files[0].fingerprint === 'string') {
localStorage.setItem('pdfjs.history', databaseStr); localStorage.setItem('pdfjs.history', databaseStr);
localStorage.removeItem('database'); localStorage.removeItem('database');
value = databaseStr; value = databaseStr;
} }
} catch (ex) { } } catch (ex) { }
}
} }
resolve(value);
} }
}); resolve(value);
}, }
});
}
set: function ViewHistory_set(name, val) { set(name, val) {
if (!this.isInitializedPromiseResolved) { if (!this.isInitializedPromiseResolved) {
return; return;
}
this.file[name] = val;
return this._writeToStorage();
},
setMultiple: function ViewHistory_setMultiple(properties) {
if (!this.isInitializedPromiseResolved) {
return;
}
for (var name in properties) {
this.file[name] = properties[name];
}
return this._writeToStorage();
},
get: function ViewHistory_get(name, defaultValue) {
if (!this.isInitializedPromiseResolved) {
return defaultValue;
}
return this.file[name] || defaultValue;
} }
}; this.file[name] = val;
return this._writeToStorage();
}
return ViewHistory; setMultiple(properties) {
})(); if (!this.isInitializedPromiseResolved) {
return;
}
for (var name in properties) {
this.file[name] = properties[name];
}
return this._writeToStorage();
}
get(name, defaultValue) {
if (!this.isInitializedPromiseResolved) {
return defaultValue;
}
return this.file[name] || defaultValue;
}
}
export { export {
ViewHistory, ViewHistory,