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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository for the
* full text of the license. */
/**
* @requires OpenLayers/SingleFile.js
*/
/**
* Constructor: OpenLayers.Class
* Base class used to construct all other classes. Includes support for
* multiple inheritance.
*
* This constructor is new in OpenLayers 2.5. At OpenLayers 3.0, the old
* syntax for creating classes and dealing with inheritance
* will be removed.
*
* To create a new OpenLayers-style class, use the following syntax:
* (code)
* var MyClass = OpenLayers.Class(prototype);
* (end)
*
* To create a new OpenLayers-style class with multiple inheritance, use the
* following syntax:
* (code)
* var MyClass = OpenLayers.Class(Class1, Class2, prototype);
* (end)
*
* Note that instanceof reflection will only reveal Class1 as superclass.
*
*/
OpenLayers.Class = function() {
var len = arguments.length;
var P = arguments[0];
var F = arguments[len-1];
var C = typeof F.initialize == "function" ?
F.initialize :
function(){ P.prototype.initialize.apply(this, arguments); };
if (len > 1) {
var newArgs = [C, P].concat(
Array.prototype.slice.call(arguments).slice(1, len-1), F);
OpenLayers.inherit.apply(null, newArgs);
} else {
C.prototype = F;
}
return C;
};
/**
* Function: OpenLayers.inherit
*
* Parameters:
* C - {Object} the class that inherits
* P - {Object} the superclass to inherit from
*
* In addition to the mandatory C and P parameters, an arbitrary number of
* objects can be passed, which will extend C.
*/
OpenLayers.inherit = function(C, P) {
var F = function() {};
F.prototype = P.prototype;
C.prototype = new F;
var i, l, o;
for(i=2, l=arguments.length; i<l; i++) {
o = arguments[i];
if(typeof o === "function") {
o = o.prototype;
}
OpenLayers.Util.extend(C.prototype, o);
}
};
/**
* APIFunction: extend
* Copy all properties of a source object to a destination object. Modifies
* the passed in destination object. Any properties on the source object
* that are set to undefined will not be (re)set on the destination object.
*
* Parameters:
* destination - {Object} The object that will be modified
* source - {Object} The object with properties to be set on the destination
*
* Returns:
* {Object} The destination object.
*/
OpenLayers.Util = OpenLayers.Util || {};
OpenLayers.Util.extend = function(destination, source) {
destination = destination || {};
if (source) {
for (var property in source) {
var value = source[property];
if (value !== undefined) {
destination[property] = value;
}
}
/**
* IE doesn't include the toString property when iterating over an object's
* properties with the for(property in object) syntax. Explicitly check if
* the source has its own toString property.
*/
/*
* FF/Windows < 2.0.0.13 reports "Illegal operation on WrappedNative
* prototype object" when calling hawOwnProperty if the source object
* is an instance of window.Event.
*/
var sourceIsEvt = typeof window.Event == "function"
&& source instanceof window.Event;
if (!sourceIsEvt
&& source.hasOwnProperty && source.hasOwnProperty("toString")) {
destination.toString = source.toString;
}
}
return destination;
};