/**
 * Meta term that denotes a Keys contains only audio
 * @const AUDIO_ONLY_META
 * @memberof jibo.animdb
 * @private
 */

/**
 * @interface LayerHandler<T>
 * @description Function type that handles a layer argument.
 * @memberof jibo.animdb
 * @private
 */

/**
 * @class AnimUtils
 * @memberof jibo.animdb
 * @private
 */

    /**
     * Add layer of requested type to animation
     * @method jibo.animdb.AnimUtils#_addMockLayer
     * @static
     * @private
     * @param {jibo.animdb#Anim} animData Animation data (for example loaded from keys file)
     * @param {string} type Layer type
     */

    /**
     * Scales the time values of all animation keyframes with a number,
     * also affects animation duration
     * @method jibo.animdb.AnimUtils#scaleTimeInPlace
     * @static
     * @param {jibo.animdb#Anim} animData Animation data (for example loaded from keys file)
     * @param {number} scale Scale multiplier
     */

    /**
     * Scales the body DoF value with a number
     * @method jibo.animdb.AnimUtils#scaleBodyInPlace
     * @static
     * @param {jibo.animdb#Anim} animData Animation data (for example loaded from keys file)
     * @param {number} scale Scale multiplier
     */

    /**
     * Flips eye and textures left/right
     * @method jibo.animdb.AnimUtils#flipScreenLeftRight
     * @static
     * @param {jibo.animdb#Anim} animDataAnimation data (for example loaded from keys file)
     */

    /**
     * Checks to see if the body starts in a neutral position
     * @method jibo.animdb.AnimUtils#startsNeutral
     * @static
     * @param {jibo.animdb#Anim} animData Animation data (for example loaded from keys file)
     * @returns {boolean}
     * @private
     */

    /**
     * Checks to see if the body ends in a neutral position
     * @method jibo.animdb.AnimUtils#endsNeutral
     * @static
     * @param {jibo.animdb#Anim} animData  Animation data (for example loaded from keys file)
     * @returns {boolean}
     * @private
     */

    /**
     * Checks each layer of the provided animation for content and returns the status of each layer
     * @method jibo.animdb.AnimUtils#checkLayers
     * @static
     * @param {jibo.animdb#Anim} animData  Animation data (for example loaded from keys file)
     * @param {boolean} [strict=true] Toggle for whether empty layers should be counted or not (default to not)
     * @returns {LayerPresence}
     * @private
     */

    /**
     * Checks to see if animation has audio
     * @method jibo.animdb.AnimUtils#hasAudio
     * @static
     * @param {jibo.animdb#Anim} animData  Animation data (for example loaded from keys file)
     * @returns {boolean}
     * @private
     */

    /**
     * Checks to see if an animation has content in the requested layer
     * @method jibo.animdb.AnimUtils#hasLayer
     * @static
     * @param {jibo.animdb#Anim} animData  Animation data (for example loaded from keys file)
     * @param {jibo.animdb.LayerName} layerName Requested layer name
     * @param {boolean} [strict=true] Toggle for whether empty layers should be counted or not (default to not)
     * @returns {boolean}
     * @private
     */

    /**
     * Checks to see if animation has a hold safe keyframe
     * @method jibo.animdb.AnimUtils#hasHoldSafe
     * @static
     * @param {jibo.animdb#Anim} animData Animation data (for example loaded from keys file)
     * @param {string} name - Name of animation
     * @returns {number} -1 if none
     * @private
     */

    /**
     * Attempts to auto extract orientation from animation
     * @method jibo.animdb.AnimUtils#calculateOrientation
     * @static
     * @param {jibo.animdb#Anim} animData  Animation data (for example loaded from keys file)
     * @returns {Orientation}
     * @private
     */

    /**
     * Iterates through all layers whose type are equal to layer type name
     * @method jibo.animdb.AnimUtils#forEachLayerType
     * @static
     * @param {jibo.animdb#Anim} animData - Animation data (for example loaded from keys file)
     * @param {jibo.animdb.LayerName} layerTypeName Layer type name matched againt all layer types
     * @param {Function} handler - Handler function for the layer
     */

    /**
     * Takes a possibly incomplete query object and inserts default values
     * @method jibo.animdb.AnimUtils#insertDefaultAnimQueryParams
     * @static
     * @param  {jibo.animdb#Anim} query Animation query
     * @mutates query
     */