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Expression functions

Expression language used to manipulate data on Stroom Dashboards and Queries.

Expressions can be used to manipulate data on Stroom Dashboards and Queries.

Each function has a name, and some have additional aliases.

In some cases, functions can be nested. The return value for some functions being used as the arguments for other functions.

The arguments to functions can either be other functions, literal values, or they can refer to fields on the input data using the field reference ${val} syntax.

Aggregate Functions

String Functions

Mathematics Functions

Type Checking Functions

Link Functions

Cast Functions

Date Functions

Logic Functions

Rounding Functions

Selection Functions

URI Functions

Value Functions

1 - Aggregate Functions

Functions that produce aggregates over multiple data points.

Aggregate functions require that the dashboard columns without aggregate functions have a grouping level applied. The aggregate function will then be evaluated against the values in the group.

Average

Takes an average value of the arguments

average(arg)
mean(arg)

Examples

average(${val})
${val} = [10, 20, 30, 40]
> 25

mean(${val})
${val} = [10, 20, 30, 40]
> 25

Count

Counts the number of records that are passed through it. Doesn’t take any notice of the values of any fields.

count()

Example

Supplying 3 values...

count()
> 3

Count Groups

This is used to count the number of unique values where there are multiple group levels. For Example, a data set grouped as follows

  1. Group by Name
  2. Group by Type

A groupCount could be used to count the number of distinct values of ’type’ for each value of ’name'

Count Unique

This is used to count the number of unique values passed to the function where grouping is used to aggregate values in other columns. For Example, a data set grouped as follows

  1. Group by Name
  2. Group by Type

countUnique() could be used to count the number of distinct values of ’type’ for each value of ’name'

Example

countUnique(${val})
${val} = ['bill', 'bob', 'fred', 'bill']
> 3

Distinct

Concatenates all distinct (unique) values together into a single string. Works in the same way as joining() except that it discards duplicate values. Values are concatenated in the order that they are given to the function. If a delimiter is supplied then the delimiter is placed between each concatenated string. If a limit is supplied then it will only concatenate up to limit values.

distinct(values)
distinct(values, delimiter)
distinct(values, delimiter, limit)

Examples

distinct(${val}, ', ')
${val} = ['bill', 'bill', 'bob', 'fred', 'bill']
> 'bill, bob, fred'

distinct(${val}, '|', 2)
${val} = ['bill', 'bill', 'bob', 'fred', 'bill']
> 'bill|bob'

Joining

Concatenates all values together into a single string. Works in the same way as distinct() except that duplicate values are included. Values are concatenated in the order that they are given to the function. If a delimiter is supplied then the delimiter is placed between each concatenated string. If a limit is supplied then it will only concatenate up to limit values.

joining(values)
joining(values, delimiter)
joining(values, delimiter, limit)

Example

joining(${val}, ', ')
${val} = ['bill', 'bob', 'fred', 'bill']
> 'bill, bob, fred, bill'

Max

Determines the maximum value given in the args.

max(arg)

Examples

max(${val})
${val} = [100, 30, 45, 109]
> 109

# They can be nested
max(max(${val}), 40, 67, 89)
${val} = [20, 1002]
> 1002

Min

Determines the minimum value given in the args.

min(arg)

Examples

min(${val})
${val} = [100, 30, 45, 109]
> 30

# They can be nested
min(max(${val}), 40, 67, 89)
${val} = [20, 1002]
> 20

StDev (Standard Deviation)

Calculate the standard deviation for a set of input values.

stDev(arg)

Examples

round(stDev(${val}))
${val} = [600, 470, 170, 430, 300]
> 147

Sum

Sums all the arguments together

sum(arg)

Examples

sum(${val})
${val} = [89, 12, 3, 45]
> 149

Variance

Calculate the variance of a set of input values.

variance(arg)

Examples

variance(${val})
${val} = [600, 470, 170, 430, 300]
> 21704

2 - Cast Functions

A set of functions for converting between different data types or for working with data types.

To Boolean

Attempts to convert the passed value to a boolean data type.

toBoolean(arg1)

Examples:

toBoolean(1)
> true
toBoolean(0)
> false
toBoolean('true')
> true
toBoolean('false')
> false

To Double

Attempts to convert the passed value to a double data type.

toDouble(arg1)

Examples:

toDouble('1.2')
> 1.2

To Integer

Attempts to convert the passed value to a integer data type.

toInteger(arg1)

Examples:

toInteger('1')
> 1

To Long

Attempts to convert the passed value to a long data type.

toLong(arg1)

Examples:

toLong('1')
> 1

To String

Attempts to convert the passed value to a string data type.

toString(arg1)

Examples:

toString(1.2)
> '1.2'

3 - Date Functions

Functions for manipulating dates and times.

Parse Date

Parse a date and return a long number of milliseconds since the epoch. For details of the pattern syntax, see Dates & Times.

parseDate(aString)
parseDate(aString, pattern)
parseDate(aString, pattern, timeZone)

Example

parseDate('2014 02 22', 'yyyy MM dd', '+0400')
> 1393012800000

Format Date

Format a date supplied as milliseconds since the epoch. For details of the format pattern syntax, see Dates & Times.

formatDate(aLong)
formatDate(aLong, pattern)
formatDate(aLong, pattern, timeZone)

Example

formatDate(1393071132888, 'yyyy MM dd', '+1200')
> '2014 02 23'

Ceiling Year/Month/Day/Hour/Minute/Second

ceilingYear(args...)
ceilingMonth(args...)
ceilingDay(args...)
ceilingHour(args...)
ceilingMinute(args...)
ceilingSecond(args...)

Examples

ceilingSecond("2014-02-22T12:12:12.888Z"
> "2014-02-22T12:12:13.000Z"
ceilingMinute("2014-02-22T12:12:12.888Z"
> "2014-02-22T12:13:00.000Z"
ceilingHour("2014-02-22T12:12:12.888Z"
> "2014-02-22T13:00:00.000Z"
ceilingDay("2014-02-22T12:12:12.888Z"
> "2014-02-23T00:00:00.000Z"
ceilingMonth("2014-02-22T12:12:12.888Z"
> "2014-03-01T00:00:00.000Z"
ceilingYear("2014-02-22T12:12:12.888Z"
> "2015-01-01T00:00:00.000Z"

Floor Year/Month/Day/Hour/Minute/Second

floorYear(args...)
floorMonth(args...)
floorDay(args...)
floorHour(args...)
floorMinute(args...)
floorSecond(args...)

Examples

floorSecond("2014-02-22T12:12:12.888Z"
> "2014-02-22T12:12:12.000Z"
floorMinute("2014-02-22T12:12:12.888Z"
> "2014-02-22T12:12:00.000Z"
floorHour("2014-02-22T12:12:12.888Z"
> 2014-02-22T12:00:00.000Z"
floorDay("2014-02-22T12:12:12.888Z"
> "2014-02-22T00:00:00.000Z"
floorMonth("2014-02-22T12:12:12.888Z"
> "2014-02-01T00:00:00.000Z"
floorYear("2014-02-22T12:12:12.888Z"
> "2014-01-01T00:00:00.000Z"

Round Year/Month/Day/Hour/Minute/Second

roundYear(args...)
roundMonth(args...)
roundDay(args...)
roundHour(args...)
roundMinute(args...)
roundSecond(args...)

Examples

roundSecond("2014-02-22T12:12:12.888Z")
> "2014-02-22T12:12:13.000Z"
roundMinute("2014-02-22T12:12:12.888Z")
> "2014-02-22T12:12:00.000Z"
roundHour("2014-02-22T12:12:12.888Z"
> "2014-02-22T12:00:00.000Z"
roundDay("2014-02-22T12:12:12.888Z"
> "2014-02-23T00:00:00.000Z"
roundMonth("2014-02-22T12:12:12.888Z"
> "2014-03-01T00:00:00.000Z"
roundYear("2014-02-22T12:12:12.888Z"
> "2014-01-01T00:00:00.000Z"

4 - Link Functions

Functions for linking to other screens in Stroom and/or to particular sets of data.

Links can be inserted into dashboard tables using the link function. All link types described in Internal Links can be added to dashboard tables using the link function. In addition to the link function there are convenience functions such as annotation, dashboard, data and stepping that make it easier to supply the required link parameters.

Annotation

A helper function to make forming links to annotations easier than using Link. The Annotation function allows you to create a link to open the Annotation editor, either to view an existing annotation or to begin creating one with pre-populated values.

annotation(text, annotationId)
annotation(text, annotationId, [streamId, eventId, title, subject, status, assignedTo, comment])

If you provide just the text and an annotationId then it will produce a link that opens an existing annotation with the supplied ID in the Annotation Edit dialog.

Example

annotation('Open annotation', ${annotation:Id})
> [Open annotation](?annotationId=1234){annotation}
annotation('Create annotation', '', ${StreamId}, ${EventId})
> [Create annotation](?annotationId=&streamId=1234&eventId=45){annotation}
annotation('Escalate', '', ${StreamId}, ${EventId}, 'Escalation', 'Triage required')
> [Escalate](?annotationId=&streamId=1234&eventId=45&title=Escalation&subject=Triage%20required){annotation}

If you don’t supply an annotationId then the link will open the Annotation Edit dialog pre-populated with the optional arguments so that an annotation can be created. If the annotationId is not provided then you must provide a streamId and an eventId. If you don’t need to pre-populate a value then you can use '' or null() instead.

Example

annotation('Create suspect event annotation', null(), 123, 456, 'Suspect Event', null(), 'assigned', 'jbloggs')
> [Create suspect event annotation](?streamId=123&eventId=456&title=Suspect%20Event&assignedTo=jbloggs){annotation}

Dashboard

A helper function to make forming links to dashboards easier than using Link.

dashboard(text, uuid)
dashboard(text, uuid, params)

Example

dashboard('Click Here','e177cf16-da6c-4c7d-a19c-09a201f5a2da')
> [Click Here](?uuid=e177cf16-da6c-4c7d-a19c-09a201f5a2da){dashboard}
dashboard('Click Here','e177cf16-da6c-4c7d-a19c-09a201f5a2da', 'userId=user1')
> [Click Here](?uuid=e177cf16-da6c-4c7d-a19c-09a201f5a2da&params=userId%3Duser1){dashboard}

Data

A helper function to make forming links to data easier than using Link.

data(text, id, partNo, [recordNo, lineFrom, colFrom, lineTo, colTo, viewType, displayType])

Example

data('Quick View', ${StreamId}, 1)
> [Quick View]?id=1234&&partNo=1)

Example of non-segmented raw data section, viewed un-formatted in a stroom tab:

data('View Raw', ${StreamId}, ${partNo}, null(), 5, 1, 5, 342, 'source', 'tab')

Example of a single record (event) from a segmented stream, viewed formatted in a popup dialog:

data('View Cooked', ${StreamId}, 1, ${eventId})

Example of a single record (event) from a segmented stream, viewed formatted in a stroom tab:

data('View Cooked', ${StreamId}, 1, ${eventId}, null(), null(), null(), null(), 'preview', 'tab')

Create a string that represents a hyperlink for display in a dashboard table.

link(url)
link(text, url)
link(text, url, type)

Example

link('https://www.somehost.com/somepath')
> [https://www.somehost.com/somepath](https://www.somehost.com/somepath)
link('Click Here','https://www.somehost.com/somepath')
> [Click Here](https://www.somehost.com/somepath)
link('Click Here','https://www.somehost.com/somepath', 'dialog')
> [Click Here](https://www.somehost.com/somepath){dialog}
link('Click Here','https://www.somehost.com/somepath', 'dialog|Dialog Title')
> [Click Here](https://www.somehost.com/somepath){dialog|Dialog Title}

Stepping

Open the Stepping tab for the requested data source.

stepping(text, id)
stepping(text, id, partNo)
stepping(text, id, partNo, recordNo)

Example

stepping('Click here to step',${StreamId})
> [Click here to step](?id=1)

5 - Logic Funtions

Equals

Evaluates if arg1 is equal to arg2

arg1 = arg2
equals(arg1, arg2)

Examples

'foo' = 'bar'
> false
'foo' = 'foo'
> true
51 = 50
> false
50 = 50
> true

equals('foo', 'bar')
> false
equals('foo', 'foo')
> true
equals(51, 50)
> false
equals(50, 50)
> true

Note that equals cannot be applied to null and error values, e.g. x=null() or x=err(). The isNull() and isError() functions must be used instead.

Greater Than

Evaluates if arg1 is greater than to arg2

arg1 > arg2
greaterThan(arg1, arg2)

Examples

51 > 50
> true
50 > 50
> false
49 > 50
> false

greaterThan(51, 50)
> true
greaterThan(50, 50)
> false
greaterThan(49, 50)
> false

Greater Than or Equal To

Evaluates if arg1 is greater than or equal to arg2

arg1 >= arg2
greaterThanOrEqualTo(arg1, arg2)

Examples

51 >= 50
> true
50 >= 50
> true
49 >= 50
> false

greaterThanOrEqualTo(51, 50)
> true
greaterThanOrEqualTo(50, 50)
> true
greaterThanOrEqualTo(49, 50)
> false

If

Evaluates the supplied boolean condition and returns one value if true or another if false

if(expression, trueReturnValue, falseReturnValue)

Examples

if(5 < 10, 'foo', 'bar')
> 'foo'
if(5 > 10, 'foo', 'bar')
> 'bar'
if(isNull(null()), 'foo', 'bar')
> 'foo'

Less Than

Evaluates if arg1 is less than to arg2

arg1 < arg2
lessThan(arg1, arg2)

Examples

51 < 50
> false
50 < 50
> false
49 < 50
> true

lessThan(51, 50)
> false
lessThan(50, 50)
> false
lessThan(49, 50)
> true

Less Than or Equal To

Evaluates if arg1 is less than or equal to arg2

arg1 <= arg2
lessThanOrEqualTo(arg1, arg2)

Examples

51 <= 50
> false
50 <= 50
> true
49 <= 50
> true

lessThanOrEqualTo(51, 50)
> false
lessThanOrEqualTo(50, 50)
> true
lessThanOrEqualTo(49, 50)
> true

And

If all supplied arguments evaluate to true then return true, else false.

and(booleanValue, booleanValue)

Or

If one or more of the supplied arguments evaluate to true then return true, else false.

or(booleanValue, booleanValue)

Not

Inverts boolean values making true, false etc.

not(booleanValue)

Examples

not(5 > 10)
> true
not(5 = 5)
> false
not(false())
> true

6 - Mathematics Functions

Standard mathematical functions, such as add subtract, multiple, etc.

Add

arg1 + arg2

Or reduce the args by successive addition

add(args...)

Examples

34 + 9
> 43
add(45, 6, 72)
> 123

Divide

Divides arg1 by arg2

arg1 / arg2

Or reduce the args by successive division

divide(args...)

Examples

42 / 7
> 6
divide(1000, 10, 5, 2)
> 10
divide(100, 4, 3)
> 8.33

Max

Determines the maximum value given in the args

max(args...)

Examples

max(100, 30, 45, 109)
> 109

# They can be nested
max(max(${val}), 40, 67, 89)
${val} = [20, 1002]
> 1002

Min

Determines the minimum value given in the args

min(args...)

Examples

min(100, 30, 45, 109)
> 30

They can be nested

min(max(${val}), 40, 67, 89)
${val} = [20, 1002]
> 20

Modulo

Determines the modulus of the dividend divided by the divisor.

modulo(dividend, divisor)

Examples

modulo(100, 30)
> 10

Multiply

Multiplies arg1 by arg2

arg1 * arg2

Or reduce the args by successive multiplication

multiply(args...)

Examples

4 * 5
> 20
multiply(4, 5, 2, 6)
> 240

Negate

Multiplies arg1 by -1

negate(arg1)

Examples

negate(80)
> -80
negate(23.33)
> -23.33
negate(-9.5)
> 9.5

Power

Raises arg1 to the power arg2

arg1 ^ arg2

Or reduce the args by successive raising to the power

power(args...)

Examples

4 ^ 3
> 64
power(2, 4, 3)
> 4096

Random

Generates a random number between 0.0 and 1.0

random()

Examples

random()
> 0.78
random()
> 0.89
...you get the idea

Subtract

arg1 - arg2

Or reduce the args by successive subtraction

subtract(args...)

Examples

29 - 8
> 21
subtract(100, 20, 34, 2)
> 44

Sum

Sums all the arguments together

sum(args...)

Examples

sum(89, 12, 3, 45)
> 149

Rounding Functions

These functions require a value, and an optional decimal places. If the decimal places are not given it will give you nearest whole number.

Ceiling

ceiling(value, decimalPlaces<optional>)

Examples

ceiling(8.4234)
> 9
ceiling(4.56, 1)
> 4.6
ceiling(1.22345, 3)
> 1.223

Floor

floor(value, decimalPlaces<optional>)

Examples

floor(8.4234)
> 8
floor(4.56, 1)
> 4.5
floor(1.2237, 3)
> 1.223

Round

round(value, decimalPlaces<optional>)

Examples

round(8.4234)
> 8
round(4.56, 1)
> 4.6
round(1.2237, 3)
> 1.224

Statistical Functions

Average

Takes an average value of the arguments. The alias mean can be used instead.

average(args...)
mean(args...)

Examples

average(10, 20, 30, 40)
> 25
mean(8.9, 24, 1.2, 1008)
> 260.525

StDev (Standard Deviation)

Calculate the standard deviation for a set of input values.

stDev(args...)

Examples

round(stDev(600, 470, 170, 430, 300))
> 147

Variance

Calculate the variance of a set of input values.

variance(args...)

Examples

variance(600, 470, 170, 430, 300)
> 21704

7 - Selection Functions

Functions for selecting a sub-set of a set of data.

Selection functions are a form of aggregate function operating on grouped data. They select a sub-set of the child values.

Any

Selects the first value found in the group that is not null() or err(). If no explicit ordering is set then the value selected is indeterminate.

any(${val})

Examples

any(${val})
${val} = [10, 20, 30, 40]
> 10

Bottom

Selects the bottom N values and returns them as a delimited string in the order they are read.

bottom(${val}, delimiter, limit)

Example

bottom(${val}, ', ', 2)
${val} = [10, 20, 30, 40]
> '30, 40'

First

Selects the first value found in the group even if it is null() or err(). If no explicit ordering is set then the value selected is indeterminate.

first(${val})

Example

first(${val})
${val} = [10, 20, 30, 40]
> 10

Last

Selects the last value found in the group even if it is null() or err(). If no explicit ordering is set then the value selected is indeterminate.

last(${val})

Example

last(${val})
${val} = [10, 20, 30, 40]
> 40

Nth

Selects the Nth value in a set of grouped values. If there is no explicit ordering on the field selected then the value returned is indeterminate.

nth(${val}, position)

Example

nth(${val}, 2)
${val} = [20, 40, 30, 10]
> 40

Top

Selects the top N values and returns them as a delimited string in the order they are read.

top(${val}, delimiter, limit)

Example

top(${val}, ', ', 2)
${val} = [10, 20, 30, 40]
> '10, 20'

8 - String Functions

Functions for manipulating strings (text data).

Concat

Appends all the arguments end to end in a single string

concat(args...)

Example

concat('this ', 'is ', 'how ', 'it ', 'works')
> 'this is how it works'

Contains

Tests if inputString contains subString.

contains(inputString, subString)

Example

contains('this', 'this')
> true
contains('this', 'that')
> false

Current User

Returns the username of the user running the query.

currentUser()

Example

currentUser()
> 'jbloggs'

Decode

The arguments are split into 3 parts

  1. The input value to test
  2. Pairs of regex matchers with their respective output value
  3. A default result, if the input doesn’t match any of the regexes
decode(input, test1, result1, test2, result2, ... testN, resultN, otherwise)

It works much like a Java Switch/Case statement

Example

decode(${val}, 'red', 'rgb(255, 0, 0)', 'green', 'rgb(0, 255, 0)', 'blue', 'rgb(0, 0, 255)', 'rgb(255, 255, 255)')
${val}='blue'
> rgb(0, 0, 255)
${val}='green'
> rgb(0, 255, 0)
${val}='brown'
> rgb(255, 255, 255) // falls back to the 'otherwise' value

in Java, this would be equivalent to

String decode(value) {
    switch(value) {
        case "red":
            return "rgb(255, 0, 0)"
        case "green":
            return "rgb(0, 255, 0)"
        case "blue":
            return "rgb(0, 0, 255)"
        default:
            return "rgb(255, 255, 255)"
    }
}

decode('red')
> 'rgb(255, 0, 0)'

DecodeUrl

Decodes a URL

decodeUrl('userId%3Duser1')
> userId=user1

EncodeUrl

Encodes a URL

encodeUrl('userId=user1')
> userId%3Duser1

Exclude

If the supplied string matches one of the supplied match strings then return null, otherwise return the supplied string

exclude(aString, match...)

Example

exclude('hello', 'hello', 'hi')
> null
exclude('hi', 'hello', 'hi')
> null
exclude('bye', 'hello', 'hi')
> 'bye'

Hash

Cryptographically hashes a string

hash(value)
hash(value, algorithm)
hash(value, algorithm, salt)

Example

hash(${val}, 'SHA-512', 'mysalt')
> A hashed result...

If not specified the hash() function will use the SHA-256 algorithm. Supported algorithms are determined by Java runtime environment.

Include

If the supplied string matches one of the supplied match strings then return it, otherwise return null

include(aString, match...)

Example

include('hello', 'hello', 'hi')
> 'hello'
include('hi', 'hello', 'hi')
> 'hi'
include('bye', 'hello', 'hi')
> null

Index Of

Finds the first position (zero based) of subString in inputString or -1 if it cannot be found. Uses a simple literal match.

indexOf(inputString, subString)

Example

indexOf('aa-bb-cc', '-')
> 2

Last Index Of

Finds the last position (zero based) of subString in inputString or -1 if it cannot be found. Uses a simple literal match.

lastIndexOf(inputString, subString)

Example

lastIndexOf('aa-bb-cc', '-')
> 5

Lower Case

Converts the string to lower case

lowerCase(aString)

Example

lowerCase('Hello DeVeLoPER')
> 'hello developer'

Match

Test an input string using a regular expression to see if it matches

match(input, regex)

Example

match('this', 'this')
> true
match('this', 'that')
> false

Query Param

Returns the value of the requested query parameter.

queryParam(paramKey)

Examples

queryParam('user')
> 'jbloggs'

Query Params

Returns all query parameters as a space delimited string.

queryParams()

Examples

queryParams()
> 'user=jbloggs site=HQ'

Replace

Perform text replacement on an input string using a regular expression to match part (or all) of the input string and a replacement string to insert in place of the matched part

replace(input, regex, replacement)

Example

replace('this', 'is', 'at')
> 'that'

String Length

Takes the length of a string

stringLength(aString)

Example

stringLength('hello')
> 5

Substring

Take a substring based on start/end index of letters

substring(aString, startIndex, endIndex)

Example

substring('this', 1, 2)
> 'h'

Substring After

Get the substring from the first string that occurs after the presence of the second string

substringAfter(firstString, secondString)

Example

substringAfter('aa-bb', '-')
> 'bb'

Substring Before

Get the substring from the first string that occurs before the presence of the second string

substringBefore(firstString, secondString)

Example

substringBefore('aa-bb', '-')
> 'aa'

Upper Case

Converts the string to upper case

upperCase(aString)

Example

upperCase('Hello DeVeLoPER')
> 'HELLO DEVELOPER'

9 - Type Checking Functions

Functions for evaluating the type of a value.

Is Boolean

Checks if the passed value is a boolean data type.

isBoolean(arg1)

Examples:

isBoolean(toBoolean('true'))
> true

Is Double

Checks if the passed value is a double data type.

isDouble(arg1)

Examples:

isDouble(toDouble('1.2'))
> true

Is Error

Checks if the passed value is an error caused by an invalid evaluation of an expression on passed values, e.g. some values passed to an expression could result in a divide by 0 error. Note that this method must be used to check for error as error equality using x=err() is not supported.

isError(arg1)

Examples:

isError(toLong('1'))
> false
isError(err())
> true

Is Integer

Checks if the passed value is an integer data type.

isInteger(arg1)

Examples:

isInteger(toInteger('1'))
> true

Is Long

Checks if the passed value is a long data type.

isLong(arg1)

Examples:

isLong(toLong('1'))
> true

Is Null

Checks if the passed value is null. Note that this method must be used to check for null as null equality using x=null() is not supported.

isNull(arg1)

Examples:

isNull(toLong('1'))
> false
isNull(null())
> true

Is Number

Checks if the passed value is a numeric data type.

isNumber(arg1)

Examples:

isNumber(toLong('1'))
> true

Is String

Checks if the passed value is a string data type.

isString(arg1)

Examples:

isString(toString(1.2))
> true

Is Value

Checks if the passed value is a value data type, e.g. not null or error.

isValue(arg1)

Examples:

isValue(toLong('1'))
> true
isValue(null())
> false

Type Of

Returns the data type of the passed value as a string.

typeOf(arg1)

Examples:

typeOf('abc')
> string
typeOf(toInteger(123))
> integer
typeOf(err())
> error
typeOf(null())
> null
typeOf(toBoolean('false'))
> false

10 - URI Functions

Functions for extracting parts from a Uniform Resource Identifier (URI).

Fields containing a Uniform Resource Identifier (URI) in string form can queried to extract the URI’s individual components of authority, fragment, host, path, port, query, scheme, schemeSpecificPart and userInfo. See either RFC 2306: Uniform Resource Identifiers (URI): Generic Syntax or Java’s java.net.URI Class for details regarding the components. If any component is not present within the passed URI, then an empty string is returned.

The extraction functions are

  • extractAuthorityFromUri() - extract the Authority component
  • extractFragmentFromUri() - extract the Fragment component
  • extractHostFromUri() - extract the Host component
  • extractPathFromUri() - extract the Path component
  • extractPortFromUri() - extract the Port component
  • extractQueryFromUri() - extract the Query component
  • extractSchemeFromUri() - extract the Scheme component
  • extractSchemeSpecificPartFromUri() - extract the Scheme specific part component
  • extractUserInfoFromUri() - extract the UserInfo component

If the URI is http://foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&amp;p2=v2#more-details the table below displays the extracted components

Expression Extraction
extractAuthorityFromUri(${URI}) foo:bar@w1.superman.com:8080
extractFragmentFromUri(${URI}) more-details
extractHostFromUri(${URI}) w1.superman.com
extractPathFromUri(${URI}) /very/long/path.html
extractPortFromUri(${URI}) 8080
extractQueryFromUri(${URI}) p1=v1&p2=v2
extractSchemeFromUri(${URI}) http
extractSchemeSpecificPartFromUri(${URI}) //foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2
extractUserInfoFromUri(${URI}) foo:bar

extractAuthorityFromUri

Extracts the Authority component from a URI

extractAuthorityFromUri(uri)

Example

extractAuthorityFromUri('http://foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2#more-details')
> 'foo:bar@w1.superman.com:8080'

extractFragmentFromUri

Extracts the Fragment component from a URI

extractFragmentFromUri(uri)

Example

extractFragmentFromUri('http://foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2#more-details')
> 'more-details'

extractHostFromUri

Extracts the Host component from a URI

extractHostFromUri(uri)

Example

extractHostFromUri('http://foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2#more-details')
> 'w1.superman.com'

extractPathFromUri

Extracts the Path component from a URI

extractPathFromUri(uri)

Example

extractPathFromUri('http://foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2#more-details')
> '/very/long/path.html'

extractPortFromUri

Extracts the Port component from a URI

extractPortFromUri(uri)

Example

extractPortFromUri('http://foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2#more-details')
> '8080'

extractQueryFromUri

Extracts the Query component from a URI

extractQueryFromUri(uri)

Example

extractQueryFromUri('http://foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2#more-details')
> 'p1=v1&p2=v2'

extractSchemeFromUri

Extracts the Scheme component from a URI

extractSchemeFromUri(uri)

Example

extractSchemeFromUri('http://foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2#more-details')
> 'http'

extractSchemeSpecificPartFromUri

Extracts the SchemeSpecificPart component from a URI

extractSchemeSpecificPartFromUri(uri)

Example

extractSchemeSpecificPartFromUri('http://foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2#more-details')
> '//foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2'

extractUserInfoFromUri

Extracts the UserInfo component from a URI

extractUserInfoFromUri(uri)

Example

extractUserInfoFromUri('http://foo:bar@w1.superman.com:8080/very/long/path.html?p1=v1&p2=v2#more-details')
> 'foo:bar'

11 - Value Functions

Functions that return a static value.

Err

Returns err

err()

False

Returns boolean false

false()

Null

Returns null

null()

True

Returns boolean true

true()