Function remRelationAll

graphdb.js:611–700

(self, index, documentindex, callback, counter)

// Traverses all RELATIONS documents and remove specific "documentindex"
function remRelationAll(self, index, documentindex, callback, counter) {

	var buf = U.createBufferSize(self.header.pagelimit * self.header.documentsize);
	var offset = offsetDocument(self, index);

	!counter && (counter = 0);

	Fs.read(self.fd, buf, 0, buf.length, offset, function(err, size) {

		if (err || !size) {
			callback(null, counter);
			return;
		}

		// type (1b)              = from: 0
		// index (1b)             = from: 1
		// state (1b)             = from: 2
		// pageindex (4b)         = from: 3
		// relationindex (4b)     = from: 7  (it's for relations between two documents in TYPE_RELATION page)
		// parentindex (4b)       = from: 11
		// size/count (2b)        = from: 15
		// data                   = from: 17

		var removed = [];

		while (true) {

			if (!buf.length)
				break;

			index++;

			var data = buf.slice(0, self.header.documentsize);

			if ((data[0] !== TYPE_RELATION && data[0] !== TYPE_RELATION_DOCUMENT) || (data[2] === STATE_REMOVED)) {
				buf = buf.slice(self.header.documentsize);
				continue;
			}

			var count = data.readUInt16LE(15);
			var arr = [];
			var is = false;

			for (var i = 0; i < count; i++) {
				var off = DATAOFFSET + (i * 6);
				var obj = {};
				obj.INDEX = data[off];
				obj.INIT = data[off + 1];
				obj.ID = data.readUInt32LE(off + 2);
				if (obj.ID === documentindex)
					is = true;
				else
					arr.push(obj);
			}

			if (is) {

				var newcount = arr.length;