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CompositeProperty.js
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CompositeProperty.js
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/*global define*/
define([
'../Core/defined',
'../Core/defineProperties',
'../Core/DeveloperError',
'../Core/TimeIntervalCollection',
'./Property'
], function(
defined,
defineProperties,
DeveloperError,
TimeIntervalCollection,
Property) {
"use strict";
/**
* A {@link Property} which is defined by a {@link TimeIntervalCollection}, where the
* data property of each {@link TimeInterval} is another Property instance which is
* evaluated at the provided time.
*
* @alias CompositeProperty
* @constructor
*
* @see CompositeMaterialProperty
* @see CompositePositionProperty
*
* @example
* var constantProperty = ...;
* var sampledProperty = ...;
*
* //Create a composite property from two previously defined properties
* //where the property is valid on August 1st, 2012 and uses a constant
* //property for the first half of the day and a sampled property for the
* //remaining half.
* var composite = new CompositeProperty();
* composite.intervals.addInterval(TimeInterval.fromIso8601('2012-08-01T00:00:00.00Z/2012-08-01T12:00:00.00Z', true, true, constantProperty));
* composite.intervals.addInterval(TimeInterval.fromIso8601('2012-08-01T12:00:00.00Z/2012-08-02T00:00:00.00Z', false, false, sampledProperty));
*/
var CompositeProperty = function() {
this._intervals = new TimeIntervalCollection();
};
defineProperties(CompositeProperty.prototype, {
/**
* Gets the interval collection.
* @memberof CompositeProperty.prototype
*
* @type {TimeIntervalCollection}
*/
intervals : {
get : function() {
return this._intervals;
}
}
});
/**
* Gets the value of the property at the provided time.
* @memberof CompositeProperty
*
* @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.
*
* @exception {DeveloperError} time is required.
*/
CompositeProperty.prototype.getValue = function(time, result) {
if (!defined(time)) {
throw new DeveloperError('time is required');
}
var innerProperty = this._intervals.findDataForIntervalContainingDate(time);
if (defined(innerProperty)) {
return innerProperty.getValue(time, result);
}
return undefined;
};
/**
* Compares this property to the provided property and returns
* <code>true</code> if they are equal, <code>false</code> otherwise.
* @memberof CompositeProperty
*
* @param {Property} [other] The other property.
* @returns {Boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
*/
CompositeProperty.prototype.equals = function(other) {
return this === other || //
(other instanceof CompositeProperty && //
this._intervals.equals(other._intervals, Property.equals));
};
return CompositeProperty;
});