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/*
* Copyright (C) 2016 Alex Yatskov <alex@foosoft.net>
* Author: Alex Yatskov <alex@foosoft.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
class Database {
constructor() {
this.db = null;
this.entities = {};
}
prepare() {
if (this.db !== null) {
return Promise.reject('database already initialized');
}
this.db = new Dexie('dict');
this.db.version(1).stores({
terms: '++id, dictionary, expression, reading',
kanji: '++, dictionary, character',
entities: '++, dictionary',
dictionaries: '++, title, version',
});
return this.db.open();
}
purge() {
if (this.db === null) {
return Promise.reject('database not initialized');
}
this.db.close();
return this.db.delete().then(() => {
this.db = null;
this.prepare();
});
}
findTerm(term, dictionaries) {
if (this.db === null) {
return Promise.reject('database not initialized');
}
const results = [];
return this.db.terms.where('expression').equals(term).or('reading').equals(term).each(row => {
if (dictionaries.includes(row.dictionary)) {
results.push({
expression: row.expression,
reading: row.reading,
tags: splitField(row.tags),
glossary: row.glossary,
id: row.id
});
}
}).then(() => {
return this.getEntities(dictionaries);
}).then(entities => {
for (const result of results) {
result.entities = entities;
}
return results;
});
}
findKanji(kanji, dictionaries) {
if (this.db === null) {
return Promise.reject('database not initialized');
}
const results = [];
return this.db.kanji.where('character').equals(kanji).each(row => {
if (dictionaries.includes(row.dictionary)) {
results.push({
character: row.character,
onyomi: splitField(row.onyomi),
kunyomi: splitField(row.kunyomi),
tags: splitField(row.tags),
glossary: row.meanings
});
}
}).then(() => {
return this.getEntities(dictionaries);
}).then(entities => {
for (const result of results) {
result.entities = entities;
}
return results;
});
}
getEntities(dictionaries) {
if (this.db === null) {
return Promise.reject('database not initialized');
}
const promises = [];
for (const dictionary of dictionaries) {
if (this.entities[dictionary]) {
promises.push(Promise.resolve(this.entities[dictionary]));
} else {
const entities = this.entities[dictionary] = {};
promises.push(
this.db.entities.where('dictionary').equals(dictionary).each(row => {
entities[row.name] = row.value;
}).then(() => entities)
);
}
}
return Promise.all(promises).then(results => {
const entities = {};
for (const result of results) {
for (const name in result) {
entities[name] = result[name];
}
}
return entities;
});
}
getDictionaries() {
if (this.db === null) {
return Promise.reject('database not initialized');
}
return this.db.dictionaries.toArray();
}
deleteDictionary(title, callback) {
if (this.db === null) {
return Promise.reject('database not initialized');
}
return this.db.dictionaries.where('title').equals(title).first(info => {
if (!info) {
return;
}
let termCounter = Promise.resolve(0);
if (info.hasTerms) {
termCounter = this.db.terms.where('dictionary').equals(title).count();
}
let kanjiCounter = Promise.resolve(0);
if (info.hasKanji) {
kanjiCounter = this.db.kanji.where('dictionary').equals(title).count();
}
return Promise.all([termCounter, kanjiCounter]).then(([termCount, kanjiCount]) => {
const rowLimit = 500;
const totalCount = termCount + kanjiCount;
let deletedCount = 0;
let termDeleter = Promise.resolve();
if (info.hasTerms) {
const termDeleterFunc = () => {
return this.db.terms.where('dictionary').equals(title).limit(rowLimit).delete().then(count => {
if (count === 0) {
return Promise.resolve();
}
deletedCount += count;
if (callback) {
callback(totalCount, deletedCount);
}
return termDeleterFunc();
});
};
termDeleter = termDeleterFunc();
}
let kanjiDeleter = Promise.resolve();
if (info.hasKanji) {
const kanjiDeleterFunc = () => {
return this.db.kanji.where('dictionary').equals(title).limit(rowLimit).delete().then(count => {
if (count === 0) {
return Promise.resolve();
}
deletedCount += count;
if (callback) {
callback(totalCount, deletedCount);
}
return kanjiDeleterFunc();
});
};
kanjiDeleter = kanjiDeleterFunc();
}
return Promise.all([termDeleter, kanjiDeleter]);
});
}).then(() => {
return this.db.entities.where('dictionary').equals(title).delete();
}).then(() => {
return this.db.dictionaries.where('title').equals(title).delete();
});
}
importDictionary(indexUrl, callback) {
if (this.db === null) {
return Promise.reject('database not initialized');
}
let summary = null;
const indexLoaded = (title, version, entities, hasTerms, hasKanji) => {
summary = {title, hasTerms, hasKanji, version};
return this.db.dictionaries.where('title').equals(title).count().then(count => {
if (count > 0) {
return Promise.reject(`dictionary "${title}" is already imported`);
}
return this.db.dictionaries.add({title, version, hasTerms, hasKanji}).then(() => {
this.entities = entities || {};
const rows = [];
for (const name in entities || {}) {
rows.push({name, value: entities[name], dictionary: title});
}
return this.db.entities.bulkAdd(rows);
});
});
};
const termsLoaded = (title, entries, total, current) => {
const rows = [];
for (const [expression, reading, tags, ...glossary] of entries) {
rows.push({
expression,
reading,
tags,
glossary,
dictionary: title
});
}
return this.db.terms.bulkAdd(rows).then(() => {
if (callback) {
callback(total, current, indexUrl);
}
});
};
const kanjiLoaded = (title, entries, total, current) => {
const rows = [];
for (const [character, onyomi, kunyomi, tags, ...meanings] of entries) {
rows.push({
character,
onyomi,
kunyomi,
tags,
meanings,
dictionary: title
});
}
return this.db.kanji.bulkAdd(rows).then(() => {
if (callback) {
callback(total, current, indexUrl);
}
});
};
return importJsonDb(indexUrl, indexLoaded, termsLoaded, kanjiLoaded).then(() => summary);
}
}
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