org.pentaho.di.core.variables

Class Variables

java.lang.Object

org.pentaho.di.core.variables.Variables

All Implemented Interfaces:

VariableSpace

public class Variables
extends Object
implements VariableSpace

This class is an implementation of VariableSpace

Author:

Sven Boden

Constructor Summary

Constructors

Constructor and Description
Variables()

Method Summary

Modifier and Type	Method and Description
void	copyVariablesFrom(VariableSpace space) Copy the variables from another space, without initializing with the defaults.
String	environmentSubstitute(String aString) Substitute the string using the current variable space.
String[]	environmentSubstitute(String[] string) Replaces environment variables in an array of strings.
String	fieldSubstitute(String aString, RowMetaInterface rowMeta, Object[] rowData) Substitutes field values in aString.
static VariableSpace	getADefaultVariableSpace() Get a default variable space as a placeholder.
boolean	getBooleanValueOfVariable(String variableName, boolean defaultValue) This method returns a boolean for the new variable check boxes.
VariableSpace	getParentVariableSpace() Get the parent of the variable space.
String	getVariable(String variableName) Get the value of a variable.
String	getVariable(String variableName, String defaultValue) Get the value of a variable with a default in case the variable is not found.
void	initializeVariablesFrom(VariableSpace parent) Initialize variable space using the defaults, copy over the variables from the parent (using copyVariablesFrom()), after this the "injected" variables should be inserted (injectVariables()).
void	injectVariables(Map<String,String> prop) Inject variables.
String[]	listVariables() List the variables (not the values) that are currently in the variable space.
void	setParentVariableSpace(VariableSpace parent) Set the parent variable space
void	setVariable(String variableName, String variableValue) Sets a variable in the Kettle Variables list.
void	shareVariablesWith(VariableSpace space) Share a variable space from another variable space.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Variables

public Variables()

Method Detail

copyVariablesFrom

public void copyVariablesFrom(VariableSpace space)

Description copied from interface: VariableSpace

Copy the variables from another space, without initializing with the defaults. This does not affect any parent relationship.

Specified by:

copyVariablesFrom in interface VariableSpace

Parameters:

space - the space to copy the variables from.

getParentVariableSpace

public VariableSpace getParentVariableSpace()

Description copied from interface: VariableSpace

Get the parent of the variable space.

Specified by:

getParentVariableSpace in interface VariableSpace

Returns:

the parent.

setParentVariableSpace

public void setParentVariableSpace(VariableSpace parent)

Description copied from interface: VariableSpace

Set the parent variable space

Specified by:

setParentVariableSpace in interface VariableSpace

Parameters:

parent - The parent variable space to set

getVariable

public String getVariable(String variableName,
                          String defaultValue)

Description copied from interface: VariableSpace

Get the value of a variable with a default in case the variable is not found.

Specified by:

getVariable in interface VariableSpace

Parameters:

variableName - The name of the variable

defaultValue - The default value in case the variable could not be found

Returns:

the String value of a variable

getVariable

public String getVariable(String variableName)

Description copied from interface: VariableSpace

Get the value of a variable.

Specified by:

getVariable in interface VariableSpace

Parameters:

variableName - The name of the variable

Returns:

the String value of a variable or null in case the variable could not be found.

getBooleanValueOfVariable

public boolean getBooleanValueOfVariable(String variableName,
                                         boolean defaultValue)

Description copied from interface: VariableSpace

This method returns a boolean for the new variable check boxes. If the variable name is not set or the variable name is not specified, this method simply returns the default value. If not, it convert the variable value to a boolean. "Y", "YES" and "TRUE" all convert to true. (case insensitive)

Specified by:

getBooleanValueOfVariable in interface VariableSpace

Parameters:

variableName - The variable to look up.

defaultValue - The default value to return.

Returns:

See Also:

static method ValueMeta.convertStringToBoolean()

initializeVariablesFrom

public void initializeVariablesFrom(VariableSpace parent)

Description copied from interface: VariableSpace

Initialize variable space using the defaults, copy over the variables from the parent (using copyVariablesFrom()), after this the "injected" variables should be inserted (injectVariables()). The parent is set as parent variable space.

Specified by:

initializeVariablesFrom in interface VariableSpace

Parameters:

parent - the parent to start from, or null if root.

listVariables

public String[] listVariables()

Description copied from interface: VariableSpace

List the variables (not the values) that are currently in the variable space.

Specified by:

listVariables in interface VariableSpace

Returns:

Array of String variable names.

setVariable

public void setVariable(String variableName,
                        String variableValue)

Description copied from interface: VariableSpace

Sets a variable in the Kettle Variables list.

Specified by:

setVariable in interface VariableSpace

Parameters:

variableName - The name of the variable to set

variableValue - The value of the variable to set. If the variableValue is null, the variable is cleared from the list.

environmentSubstitute

public String environmentSubstitute(String aString)

Description copied from interface: VariableSpace

Substitute the string using the current variable space.

Specified by:

environmentSubstitute in interface VariableSpace

Parameters:

aString - The string to substitute.

Returns:

The substituted string.

fieldSubstitute

public String fieldSubstitute(String aString,
                              RowMetaInterface rowMeta,
                              Object[] rowData)
                       throws KettleValueException

Substitutes field values in aString. Field values are of the form "?{}". The values are retrieved from the specified row. Please note that the getString() method is used to convert to a String, for all values in the row.

Specified by:

fieldSubstitute in interface VariableSpace

Parameters:

aString - the string on which to apply the substitution.

rowMeta - The row metadata to use.

rowData - The row data to use

Returns:

the string with the substitution applied.

Throws:

KettleValueException - In case there is a String conversion error

environmentSubstitute

public String[] environmentSubstitute(String[] string)

Description copied from interface: VariableSpace

Replaces environment variables in an array of strings. See also: environmentSubstitute(String string)

Specified by:

environmentSubstitute in interface VariableSpace

Parameters:

string - The array of strings that wants its variables to be replaced.

Returns:

the array with the environment variables replaced.

shareVariablesWith

public void shareVariablesWith(VariableSpace space)

Description copied from interface: VariableSpace

Share a variable space from another variable space. This means that the object should take over the space used as argument.

Specified by:

shareVariablesWith in interface VariableSpace

Parameters:

space - Variable space to be shared.

injectVariables

public void injectVariables(Map<String,String> prop)

Description copied from interface: VariableSpace

Inject variables. The behaviour should be that the properties object will be stored and at the time the VariableSpace is initialized (or upon calling this method if the space is already initialized). After injecting the link of the properties object should be removed.

Specified by:

injectVariables in interface VariableSpace

Parameters:

prop - Properties object containing key-value pairs.

getADefaultVariableSpace

public static VariableSpace getADefaultVariableSpace()

Get a default variable space as a placeholder. Everytime you will get a new instance.

Returns:

a default variable space.