ADD OPTION TO STORE OBJECT WHEN PUSHING INTERVALS

Option to pass an object when pushing intervals (can be used to store ID or
any other properties), really useful when querying points, intervals or
overlaps.

tree.pushInterval( 10, 20, { prop1 : 'Could be anything' , id : 500 } );

tree.pushArray( fromValues , toValues , [
				      { propFromObj1 : 'value' },
				      { propFromObj2 : 'value' },
				      { propFromObj3 : 'value' }
				    ]);

lib/intervals.js

@@ -8,10 +8,11 @@
 module.exports.Interval = Interval;
 module.exports.IntervalStack = IntervalStack;
 
-function Interval(from, to) {
+function Interval(from, to, obj) {
   this.id = ++Interval.prototype.id;
   this.from = from;
   this.to = to;
+  this.obj = obj;
 }
 
 Interval.prototype.id = 0;
@@ -22,7 +23,7 @@ Interval.prototype.INTERSECT_OR_SUPERSET = 3;
 
 Interval.prototype.compareTo = function(other) {
   if (other.from > this.to || other.to < this.from) return this.DISJOINT;
-  if (other.from <= this.from && other.to >= this.to) return this.SUBSET; 
+  if (other.from <= this.from && other.to >= this.to) return this.SUBSET;
   return this.INTERSECT_OR_SUPERSET;
 }
 
@@ -65,12 +66,12 @@ function _validateInterval(from, to) {
   };
 }
 
-function _validateIntervalArray(from, to) {
-  if (!(from instanceof Array && to instanceof Array)) throw {
+function _validateIntervalArray(from, to, properties) {
+  if (!(from instanceof Array && to instanceof Array && properties instanceof Array)) throw {
     name: 'InvalidParameter',
     message: 'function pushArray: parameters must be arrays'
   };
-  if (from.length !== to.length) throw {
+  if (from.length !== to.length || from.length !== properties.length) throw {
     name: 'InvalidParameter',
     message: 'function pushArray: arrays must have same length'
   };
@@ -100,16 +101,16 @@ function _validatePointArray(points) {
 }
 
 
-function pushInterval(from, to) {
+function pushInterval(from, to, obj) {
   _validateInterval(from, to);
-  this._intervals.push(new Interval(from, to));
+  this._intervals.push(new Interval(from, to, obj));
 }
 
-function pushArray(from, to, validate) {
+function pushArray(from, to, properties, validate) {
   var val = (validate !== undefined) ? validate : true;
-  if (val) _validateIntervalArray(from, to);
+  if (val) _validateIntervalArray(from, to, properties);
   for(var i = 0; i < from.length; i++) {
-    this._intervals.push(new Interval(from[i], to[i]));
+    this._intervals.push(new Interval(from[i], to[i], properties[i]));
   }
 }
 
@@ -150,4 +151,3 @@ function queryIntervalArray(from, to, options) {
   }
   return this._queryInterval(intervalArray, resFn, disjointFn);
 }
-