/
Property.js
143 lines (132 loc) · 4.16 KB
/
Property.js
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/*global define*/
define([
'../Core/defaultValue',
'../Core/defined',
'../Core/defineProperties',
'../Core/DeveloperError',
'../Core/Iso8601'
], function(
defaultValue,
defined,
defineProperties,
DeveloperError,
Iso8601) {
"use strict";
/**
* The interface for all properties, which represent a value that can optionally vary over time.
* This type defines an interface and cannot be instantiated directly.
*
* @alias Property
* @constructor
*
* @see CompositeProperty
* @see ConstantProperty
* @see SampledProperty
* @see TimeIntervalCollectionProperty
* @see MaterialProperty
* @see PositionProperty
* @see ReferenceProperty
*/
var Property = function() {
DeveloperError.throwInstantiationError();
};
defineProperties(Property.prototype, {
/**
* Gets a value indicating if this property is constant. A property is considered
* constant if getValue always returns the same result for the current definition.
* @memberof Property.prototype
*
* @type {Boolean}
* @readonly
*/
isConstant : {
get : DeveloperError.throwInstantiationError
},
/**
* Gets the event that is raised whenever the definition of this property changes.
* The definition is considered to have changed if a call to getValue would return
* a different result for the same time.
* @memberof Property.prototype
*
* @type {Event}
* @readonly
*/
definitionChanged : {
get : DeveloperError.throwInstantiationError
}
});
/**
* Gets the value of the property at the provided time.
* @function
*
* @param {JulianDate} time The time for which to retrieve the value.
* @param {Object} [result] The object to store the value into, if omitted, a new instance is created and returned.
* @returns {Object} The modified result parameter or a new instance if the result parameter was not supplied.
*/
Property.prototype.getValue = DeveloperError.throwInstantiationError;
/**
* Compares this property to the provided property and returns
* <code>true</code> if they are equal, <code>false</code> otherwise.
* @function
*
* @param {Property} [other] The other property.
* @returns {Boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
*/
Property.prototype.equals = DeveloperError.throwInstantiationError;
/**
* @private
*/
Property.equals = function(left, right) {
return left === right || (defined(left) && left.equals(right));
};
/**
* @private
*/
Property.arrayEquals = function(left, right) {
if (left === right) {
return true;
}
if ((!defined(left) || !defined(right)) || (left.length !== right.length)) {
return false;
}
var length = left.length;
for (var i = 0; i < length; i++) {
if (!Property.equals(left[i], right[i])) {
return false;
}
}
return true;
};
/**
* @private
*/
Property.isConstant = function(property) {
return !defined(property) || property.isConstant;
};
/**
* @private
*/
Property.getValueOrUndefined = function(property, time, result) {
return defined(property) ? property.getValue(time, result) : undefined;
};
/**
* @private
*/
Property.getValueOrDefault = function(property, time, valueDefault, result) {
return defined(property) ? defaultValue(property.getValue(time, result), valueDefault) : valueDefault;
};
/**
* @private
*/
Property.getValueOrClonedDefault = function(property, time, valueDefault, result) {
var value;
if (defined(property)) {
value = property.getValue(time, result);
}
if (!defined(value)) {
value = valueDefault.clone(value);
}
return value;
};
return Property;
});