forerunnerdb
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A NoSQL document store database for browsers and Node.js.
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<h1 class="page-title">Source: IndexBinaryTree.js</h1>
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<pre class="prettyprint source linenums"><code>"use strict";
/*
name(string)
id(string)
rebuild(null)
state ?? needed?
match(query, options)
lookup(query, options)
insert(doc)
remove(doc)
primaryKey(string)
collection(collection)
*/
var Shared = require('./Shared'),
Path = require('./Path'),
BinaryTree = require('./BinaryTree');
/**
* The index class used to instantiate btree indexes that the database can
* use to speed up queries on collections and views.
* @constructor
*/
var IndexBinaryTree = function () {
this.init.apply(this, arguments);
};
IndexBinaryTree.prototype.init = function (keys, options, collection) {
this._btree = new BinaryTree();
this._btree.index(keys);
this._size = 0;
this._id = this._itemKeyHash(keys, keys);
this._debug = options && options.debug ? options.debug : false;
this.unique(options && options.unique ? options.unique : false);
if (keys !== undefined) {
this.keys(keys);
}
if (collection !== undefined) {
this.collection(collection);
this._btree.primaryKey(collection.primaryKey());
}
this.name(options && options.name ? options.name : this._id);
this._btree.debug(this._debug);
};
Shared.addModule('IndexBinaryTree', IndexBinaryTree);
Shared.mixin(IndexBinaryTree.prototype, 'Mixin.ChainReactor');
Shared.mixin(IndexBinaryTree.prototype, 'Mixin.Sorting');
IndexBinaryTree.prototype.id = function () {
return this._id;
};
IndexBinaryTree.prototype.state = function () {
return this._state;
};
IndexBinaryTree.prototype.size = function () {
return this._size;
};
Shared.synthesize(IndexBinaryTree.prototype, 'data');
Shared.synthesize(IndexBinaryTree.prototype, 'name');
Shared.synthesize(IndexBinaryTree.prototype, 'collection');
Shared.synthesize(IndexBinaryTree.prototype, 'type');
Shared.synthesize(IndexBinaryTree.prototype, 'unique');
IndexBinaryTree.prototype.keys = function (val) {
if (val !== undefined) {
this._keys = val;
// Count the keys
this._keyCount = (new Path()).parse(this._keys).length;
return this;
}
return this._keys;
};
IndexBinaryTree.prototype.rebuild = function () {
// Do we have a collection?
if (this._collection) {
// Get sorted data
var collection = this._collection.subset({}, {
$decouple: false,
$orderBy: this._keys
}),
collectionData = collection.find(),
dataIndex,
dataCount = collectionData.length;
// Clear the index data for the index
this._btree.clear();
this._size = 0;
if (this._unique) {
this._uniqueLookup = {};
}
// Loop the collection data
for (dataIndex = 0; dataIndex < dataCount; dataIndex++) {
this.insert(collectionData[dataIndex]);
}
}
this._state = {
name: this._name,
keys: this._keys,
indexSize: this._size,
built: new Date(),
updated: new Date(),
ok: true
};
};
IndexBinaryTree.prototype.insert = function (dataItem, options) {
var uniqueFlag = this._unique,
uniqueHash;
if (uniqueFlag) {
uniqueHash = this._itemHash(dataItem, this._keys);
this._uniqueLookup[uniqueHash] = dataItem;
}
if (this._btree.insert(dataItem)) {
this._size++;
return true;
}
return false;
};
IndexBinaryTree.prototype.remove = function (dataItem, options) {
var uniqueFlag = this._unique,
uniqueHash;
if (uniqueFlag) {
uniqueHash = this._itemHash(dataItem, this._keys);
delete this._uniqueLookup[uniqueHash];
}
if (this._btree.remove(dataItem)) {
this._size--;
return true;
}
return false;
};
IndexBinaryTree.prototype.violation = function (dataItem) {
// Generate item hash
var uniqueHash = this._itemHash(dataItem, this._keys);
// Check if the item breaks the unique constraint
return Boolean(this._uniqueLookup[uniqueHash]);
};
IndexBinaryTree.prototype.hashViolation = function (uniqueHash) {
// Check if the item breaks the unique constraint
return Boolean(this._uniqueLookup[uniqueHash]);
};
IndexBinaryTree.prototype.lookup = function (query, options, op) {
return this._btree.lookup(query, options, op);
};
IndexBinaryTree.prototype.match = function (query, options) {
return this._btree.match(query, options);
};
IndexBinaryTree.prototype._itemHash = function (item, keys) {
var path = new Path(),
pathData,
hash = '',
k;
pathData = path.parse(keys);
for (k = 0; k < pathData.length; k++) {
if (hash) { hash += '_'; }
hash += path.value(item, pathData[k].path).join(':');
}
return hash;
};
IndexBinaryTree.prototype._itemKeyHash = function (item, keys) {
var path = new Path(),
pathData,
hash = '',
k;
pathData = path.parse(keys);
for (k = 0; k < pathData.length; k++) {
if (hash) { hash += '_'; }
hash += path.keyValue(item, pathData[k].path);
}
return hash;
};
IndexBinaryTree.prototype._itemHashArr = function (item, keys) {
var path = new Path(),
pathData,
//hash = '',
hashArr = [],
valArr,
i, k, j;
pathData = path.parse(keys);
for (k = 0; k < pathData.length; k++) {
valArr = path.value(item, pathData[k].path);
for (i = 0; i < valArr.length; i++) {
if (k === 0) {
// Setup the initial hash array
hashArr.push(valArr[i]);
} else {
// Loop the hash array and concat the value to it
for (j = 0; j < hashArr.length; j++) {
hashArr[j] = hashArr[j] + '_' + valArr[i];
}
}
}
}
return hashArr;
};
// Register this index on the shared object
Shared.index.btree = IndexBinaryTree;
Shared.finishModule('IndexBinaryTree');
module.exports = IndexBinaryTree;</code></pre>
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