udf

Expandable Collection User Defined Function

Usage

Data substitution

    aMap := data.NewMap();
    aMap.Put("ts", "2015-02-11")
    udf.Register(aMap)
    expanded := aMap.ExpandAsText(`$FormatTime($ts, "yyyy")`)
 

Data node selection

	holder := data.NewMap()
    collection := data.NewCollection()
    collection.Push(map[string]interface{}{
        "amount": 2,
        "id":2,
        "name":"p1",
        "vendor":"v1",
    })
    collection.Push(map[string]interface{}{
        "amount": 12,
        "id":3,
        "name":"p2",
        "vendor":"v2",
    })
    holder.SetValue("node1.obj", collection)

	records, err := Select([]interface{}{"node1/obj/*", "id", "name:product"}, holder)

The list of defined UDFs

• Length, Len returns length of slice, map or string
• AsMap - convert source into a map, it accepts data structure, or JSON, YAML literal
• AsCollection - convert source into a slice, it accepts data structure, or JSON, YAML literal
• AsData - convert source into a map or slice, it accepts data structure, or JSON, YAML literal
• AsInt - convert source into a an int
• AsFloat - convert source into a a float
• AsBool - convert source into a boolean
• AsNumber - converts to either int or float
• FormatTime, takes two arguments, date or now, followed by java style date format
• Values - returns map values
• Keys - return map keys
• IndexOf - returns index of matched slice element
• Join - join slice element with supplied separator
• Split - split text by separator
• Sum - sums values for matched Path, i.e. $Sum('node1/obj/*/amount')
• Count - counts values for matched Path, i.e. $Sum('node1/obj/*/amount')
• Select - selects attribute for matched path, i.e $Select("node1/obj/*", "id", "name:product")
• QueryEscape - url escape
• QueryUnescape - url unescape
• Base64Encode
• Base64DecodeText
• TrimSpace
• Elapsed elapsed time
• Rand
• Replace
• ToLower
• ToUpper
• AsNewLineDelimitedJSON