ExpandAsColumns (BeepBeep 3 Palettes API Reference)

java.lang.Object
- ca.uqac.lif.cep.functions.Function
- - ca.uqac.lif.cep.functions.UnaryFunction<Tuple,Tuple>
  - - ca.uqac.lif.cep.tuples.ExpandAsColumns

All Implemented Interfaces:

ca.uqac.lif.azrael.Printable, ca.uqac.lif.azrael.Readable, ca.uqac.lif.cep.Duplicable, ca.uqac.lif.cep.functions.DuplicableFunction
```
public class ExpandAsColumns
extends ca.uqac.lif.cep.functions.UnaryFunction<Tuple,Tuple>
```
Transforms a tuple by replacing two key-value pairs by a single new key-value pair. The new pair is created by taking the value of a column as the key, and the value of another column as the value.
For example, with the tuple: {(foo,1), (bar,2), (baz,3)}, using "foo" as the "key" column and "baz" as the value column, the resulting tuple would be: {(1,3), (bar,2)}. The value of foo is the new key, and the value of baz is the new value.
If the value of the "key" pair is not a string, it is converted into a string by calling its toString() method (since the key of a tuple is always a string).

Author:

Sylvain Hallé

Field Summary

Fields
Modifier and Type	Field	Description
`protected java.lang.String`	`m_columnName`	The name of the column whose value will be used as a column header
`protected java.lang.String`	`m_columnValue`	The name of the column whose value will be used as a value for the newly created column

Fields inherited from class ca.uqac.lif.cep.functions.Function
s_maxInputArity

Constructor Summary

Constructors
Constructor Description

ExpandAsColumns(java.lang.String col_name, java.lang.String col_value)
Creates a new instance of the function.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

ExpandAsColumns duplicate(boolean with_state)

Tuple getValue(Tuple x)
- Methods inherited from class ca.uqac.lif.cep.functions.UnaryFunction
  evaluate, getInputArity, getInputTypesFor, getOutputArity, getOutputTypeFor, reset
- Methods inherited from class ca.uqac.lif.cep.functions.Function
  duplicate, evaluate, evaluate, evaluateLazy, evaluatePartial, print, printState, read, readState
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - m_columnName
```
protected java.lang.String m_columnName
```
    The name of the column whose value will be used as a column header
  - m_columnValue
```
protected java.lang.String m_columnValue
```
    The name of the column whose value will be used as a value for the newly created column
- Constructor Detail
  - ExpandAsColumns
```
public ExpandAsColumns(java.lang.String col_name,
                       java.lang.String col_value)
```
    Creates a new instance of the function.
    
    Parameters:
    
    col_name - The name of the column whose value will be used as a column header
    
    col_value - The name of the column whose value will be used as a value for the newly created column
- Method Detail
  - getValue
```
public Tuple getValue(Tuple x)
```
    Specified by:
    
    getValue in class ca.uqac.lif.cep.functions.UnaryFunction<Tuple,Tuple>
  - duplicate
```
public ExpandAsColumns duplicate(boolean with_state)
```
    Specified by:
    
    duplicate in interface ca.uqac.lif.cep.Duplicable
    
    Overrides:
    
    duplicate in class ca.uqac.lif.cep.functions.UnaryFunction<Tuple,Tuple>