API Docs - v1.0.0
Tested Siddhi Core version: 5.1.4
It could also support other Siddhi Core minor versions.
List
collect (Aggregate Function)
Collects multiple values to construct a list.
Syntax<OBJECT> list:collect(<OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value)
<OBJECT> list:collect(<OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value, <BOOL> is.distinct)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| value | Value of the list element |
OBJECT INT LONG FLOAT DOUBLE BOOL STRING |
No | Yes | |
| is.distinct | If |
false | BOOL | Yes | Yes |
Examples EXAMPLE 1
from StockStream#window.lengthBatch(10)
select list:collect(symbol) as stockSymbols
insert into OutputStream;
For the window expiry of 10 events, the collect() function will collect attributes of symbol to a single list and return as stockSymbols.
merge (Aggregate Function)
Collects multiple lists to merge as a single list.
Syntax<OBJECT> list:merge(<OBJECT> list)
<OBJECT> list:merge(<OBJECT> list, <BOOL> is.distinct)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | List to be merged |
OBJECT | No | Yes | |
| is.distinct | Whether to return list with distinct values |
false | BOOL | Yes | Yes |
Examples EXAMPLE 1
from StockStream#window.lengthBatch(2)
select list:merge(list) as stockSymbols
insert into OutputStream;
For the window expiry of 2 events, the merge() function will collect attributes of list and merge them to a single list, returned as stockSymbols.
add (Function)
Function returns the updated list after adding the given value.
Syntax<OBJECT> list:add(<OBJECT> list, <OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value)
<OBJECT> list:add(<OBJECT> list, <OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value, <INT> index)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list to which the value should be added. |
OBJECT | No | Yes | |
| value | The value to be added. |
OBJECT INT LONG FLOAT DOUBLE BOOL STRING |
No | Yes | |
| index | The index in which the value should to be added. |
last | INT | Yes | Yes |
Examples EXAMPLE 1
list:add(stockSymbols, 'IBM')
Function returns the updated list after adding the value IBM in the last index.
EXAMPLE 2
list:add(stockSymbols, 'IBM', 0)
Function returns the updated list after adding the value IBM in the 0th index`.
addAll (Function)
Function returns the updated list after adding all the values from the given list.
Syntax<OBJECT> list:addAll(<OBJECT> to.list, <OBJECT> from.list)
<OBJECT> list:addAll(<OBJECT> to.list, <OBJECT> from.list, <BOOL> is.distinct)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| to.list | The list into which the values need to copied. |
OBJECT | No | Yes | |
| from.list | The list from which the values are copied. |
OBJECT | No | Yes | |
| is.distinct | If |
false | BOOL | Yes | Yes |
Examples EXAMPLE 1
list:putAll(toList, fromList)
If toList contains values ('IBM', 'WSO2), and if fromList contains values ('IBM', 'XYZ') then the function returns updated toList with values ('IBM', 'WSO2', 'IBM', 'XYZ').
EXAMPLE 2
list:putAll(toList, fromList, true)
If toList contains values ('IBM', 'WSO2), and if fromList contains values ('IBM', 'XYZ') then the function returns updated toList with values ('IBM', 'WSO2', 'XYZ').
clear (Function)
Function returns the cleared list.
Syntax<OBJECT> list:clear(<OBJECT> list)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list which needs to be cleared |
OBJECT | No | Yes |
Examples EXAMPLE 1
list:clear(stockDetails)
Returns an empty list.
clone (Function)
Function returns the cloned list.
Syntax<OBJECT> list:clone(<OBJECT> list)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list to which needs to be cloned. |
OBJECT | No | Yes |
Examples EXAMPLE 1
list:clone(stockSymbols)
Function returns cloned list of stockSymbols.
contains (Function)
Function checks whether the list contains the specific value.
Syntax<BOOL> list:contains(<OBJECT> list, <OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list that needs to be checked on whether it contains the value or not. |
OBJECT | No | Yes | |
| value | The value that needs to be checked. |
OBJECT INT LONG FLOAT DOUBLE BOOL STRING |
No | Yes |
Examples EXAMPLE 1
list:contains(stockSymbols, 'IBM')
Returns 'true' if the stockSymbols list contains value IBM else it returns false.
containsAll (Function)
Function checks whether the list contains all the values in the given list.
Syntax<BOOL> list:containsAll(<OBJECT> list, <OBJECT> given.list)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list that needs to be checked on whether it contains all the values or not. |
OBJECT | No | Yes | |
| given.list | The list which contains all the values to be checked. |
OBJECT | No | Yes |
Examples EXAMPLE 1
list:containsAll(stockSymbols, latestStockSymbols)
Returns 'true' if the stockSymbols list contains values in latestStockSymbols else it returns false.
create (Function)
Function creates a list containing all values provided.
Syntax<OBJECT> list:create()
<OBJECT> list:create(<OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value1)
<OBJECT> list:create(<OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value1, <OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> ...)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| value1 | Value 1 |
OBJECT INT LONG FLOAT DOUBLE BOOL STRING |
Yes | Yes |
Examples EXAMPLE 1
list:create(1, 2, 3, 4, 5, 6)
This returns a list with values 1, 2, 3, 4, 5 and 6.
EXAMPLE 2
list:create()
This returns an empty list.
get (Function)
Function returns the value at the specific index, null if index is out of range.
Syntax<OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> list:get(<OBJECT> list, <INT> index)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | Attribute containing the list |
OBJECT | No | Yes | |
| index | Index of the element |
INT | No | Yes |
Examples EXAMPLE 1
list:get(stockSymbols, 1)
This returns the element in the 1st index in the stockSymbols list.
indexOf (Function)
Function returns the last index of the given element.
Syntax<INT> list:indexOf(<OBJECT> list, <OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list to be checked to get index of an element. |
OBJECT | No | Yes | |
| value | Value for which last index needs to be identified. |
OBJECT INT LONG FLOAT DOUBLE BOOL STRING |
No | Yes |
Examples EXAMPLE 1
list:indexOf(stockSymbols. `IBM`)
Returns the last index of the element IBM if present else it returns -1.
isEmpty (Function)
Function checks if the list is empty.
Syntax<BOOL> list:isEmpty(<OBJECT> list)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list that needs to be checked whether it's empty or not. |
OBJECT | No | Yes |
Examples EXAMPLE 1
list:isEmpty(stockSymbols)
Returns 'true' if the stockSymbols list is empty else it returns false.
isList (Function)
Function checks if the object is type of a list.
Syntax<BOOL> list:isList(<OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> arg)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| arg | The argument the need to be determined whether it's a list or not. |
OBJECT INT LONG FLOAT DOUBLE BOOL STRING |
No | Yes |
Examples EXAMPLE 1
list:isList(stockSymbols)
Returns 'true' if the stockSymbols is and an instance of java.util.List else it returns false.
lastIndexOf (Function)
Function returns the index of the given value.
Syntax<INT> list:lastIndexOf(<OBJECT> list, <OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list to be checked to get index of an element. |
OBJECT | No | Yes | |
| value | Value for which last index needs to be identified. |
OBJECT INT LONG FLOAT DOUBLE BOOL STRING |
No | Yes |
Examples EXAMPLE 1
list:lastIndexOf(stockSymbols. `IBM`)
Returns the last index of the element IBM if present else it returns -1.
remove (Function)
Function returns the updated list after removing the element with the specified value.
Syntax<OBJECT> list:remove(<OBJECT> list, <OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list that needs to be updated. |
OBJECT | No | Yes | |
| value | The value of the element that needs to removed. |
OBJECT INT LONG FLOAT DOUBLE BOOL STRING |
No | Yes |
Examples EXAMPLE 1
list:remove(stockSymbols, 'IBM')
This returns the updated list, stockSymbols after stockSymbols the value IBM.
removeAll (Function)
Function returns the updated list after removing all the element with the specified list.
Syntax<OBJECT> list:removeAll(<OBJECT> list, <OBJECT> given.list)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list that needs to be updated. |
OBJECT | No | Yes | |
| given.list | The list with all the elements that needs to removed. |
OBJECT | No | Yes |
Examples EXAMPLE 1
list:removeAll(stockSymbols, latestStockSymbols)
This returns the updated list, stockSymbols after removing all the values in latestStockSymbols.
removeByIndex (Function)
Function returns the updated list after removing the element with the specified index.
Syntax<OBJECT> list:removeByIndex(<OBJECT> list, <INT> index)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list that needs to be updated. |
OBJECT | No | Yes | |
| index | The index of the element that needs to removed. |
INT | No | Yes |
Examples EXAMPLE 1
list:removeByIndex(stockSymbols, 0)
This returns the updated list, stockSymbols after removing value at 0 th index.
retainAll (Function)
Function returns the updated list after retaining all the elements in the specified list.
Syntax<OBJECT> list:retainAll(<OBJECT> list, <OBJECT> given.list)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list that needs to be updated. |
OBJECT | No | Yes | |
| given.list | The list with all the elements that needs to reatined. |
OBJECT | No | Yes |
Examples EXAMPLE 1
list:retainAll(stockSymbols, latestStockSymbols)
This returns the updated list, stockSymbols after retaining all the values in latestStockSymbols.
setValue (Function)
Function returns the updated list after replacing the element in the given index by the given value.
Syntax<OBJECT> list:setValue(<OBJECT> list, <INT> index, <OBJECT|INT|LONG|FLOAT|DOUBLE|BOOL|STRING> value)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list to which the value should be updated. |
OBJECT | No | Yes | |
| index | The index in which the value should to be updated. |
INT | No | Yes | |
| value | The value to be updated with. |
OBJECT INT LONG FLOAT DOUBLE BOOL STRING |
No | Yes |
Examples EXAMPLE 1
list:set(stockSymbols, 0, 'IBM')
Function returns the updated list after replacing the value at 0th index with the value IBM
size (Function)
Function to return the size of the list.
Syntax<INT> list:size(<OBJECT> list)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list for which size should be returned. |
OBJECT | No | Yes |
Examples EXAMPLE 1
list:size(stockSymbols)
Returns size of the stockSymbols list.
sort (Function)
Function returns lists sorted in ascending or descending order.
Syntax<OBJECT> list:sort(<OBJECT> list)
<OBJECT> list:sort(<OBJECT> list, <STRING> order)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | The list which should be sorted. |
OBJECT | No | Yes | |
| order | Order in which the list needs to be sorted (ASC/DESC/REV). |
REV | STRING | Yes | No |
Examples EXAMPLE 1
list:sort(stockSymbols)
Function returns the sorted list in ascending order.
EXAMPLE 2
list:sort(stockSymbols, 'DESC')
Function returns the sorted list in descending order.
tokenize (Stream Processor)
Tokenize the list and return each key, value as new attributes in events
Syntaxlist:tokenize(<OBJECT> list)
list:tokenize(<OBJECT> list, <OBJECT> ...)
QUERY PARAMETERS
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| list | Array list which needs to be tokenized |
OBJECT | No | Yes |
| Name | Description | Possible Types |
|---|---|---|
| index | Index of an entry consisted in the list |
INT |
| value | Value of an entry consisted in the list |
OBJECT |
Examples EXAMPLE 1
list:tokenize(customList)
If custom list contains ('WSO2', 'IBM', 'XYZ') elements, then tokenize function will return 3 events with value attributes WSO2, IBM and XYZ respectively.