Function addPage

graphdb.js:152–202

(self, type, index, parentindex, callback)

// Creates new page
function addPage(self, type, index, parentindex, callback) {

	// @type
	// 1: classes
	// 2: relations
	// 3: relations private

	// @index
	// index of value

	// Add a new page
	self.header.pages++;

	var indexer = self.header.pages;
	var buffer = [];
	var page = U.createBufferSize(self.header.pagesize);

	// console.log('CREATING PAGE:', TYPES[type], indexer, type, index);

	page.writeUInt8(type, 0);             // type (1:class, 2:relation, 3:private)
	page.writeUInt8(index, 1);            // index
	page.writeUInt16LE(0, 2);             // documents
	page.writeUInt8(0, 4);                // freeslots
	page.writeUInt32LE(parentindex, 5);   // parentindex

	buffer.push(page);

	for (var i = 0; i < self.header.pagelimit; i++) {
		var doc = U.createBufferSize(self.header.documentsize);
		doc.writeUInt8(type, 0);
		doc.writeUInt8(index, 1);
		doc.writeUInt8(STATE_REMOVED, 2);
		doc.writeUInt32LE(self.header.pages, 3);
		doc.writeUInt32LE(0, 7);    // continuerindex
		doc.writeUInt32LE(0, 11);   // parentindex
		doc.writeUInt16LE(0, 15);   // size/count
		buffer.push(doc);
	}

	buffer = Buffer.concat(buffer);

	var offset = offsetPage(self, indexer);

	Fs.write(self.fd, buffer, 0, buffer.length, offset, function(err) {
		err && self.error(err, 'createPage.write');
		!err && updMeta(self, type === TYPE_RELATION_DOCUMENT ? META_PAGE_ADD3 : META_PAGE_ADD);
		callback && callback(err, indexer);
	});

	return indexer;
}

function addNodeFree(self, meta, callback) {