Package org.openrefine.grel.ast

Class PureArgumentsExpr

java.lang.Object

org.openrefine.grel.ast.PureArgumentsExpr

All Implemented Interfaces:

Serializable, GrelExpr

Direct Known Subclasses:

ControlCallExpr, OperatorCallExpr

public abstract class PureArgumentsExpr
extends Object
implements GrelExpr

An abstract class for an expression whose column dependencies are the union of those of their arguments.

Author:

Antonin Delpeuch

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected GrelExpr[]	_args

Constructor Summary

Constructors

Constructor	Description
PureArgumentsExpr(GrelExpr[] arguments)

Method Summary

Modifier and Type	Method	Description
Set<String>	getColumnDependencies(String baseColumn)	Returns the names of the columns this expression depends on.
boolean	isLocal()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.openrefine.grel.ast.GrelExpr

evaluate, renameColumnDependencies, toString

Field Detail

_args

protected final GrelExpr[] _args

Constructor Detail

PureArgumentsExpr

public PureArgumentsExpr(GrelExpr[] arguments)

Method Detail

getColumnDependencies

public final Set<String> getColumnDependencies(String baseColumn)

Description copied from interface: GrelExpr

Returns the names of the columns this expression depends on.

Specified by:

getColumnDependencies in interface GrelExpr

Parameters:

baseColumn - the name of the column this expression is based on (null if none)

Returns:

null if the columns could not be isolated: in this case, the expression might depend on all columns in the project.

isLocal

public boolean isLocal()

Specified by:

isLocal in interface GrelExpr

Returns:

true when the expression can be evaluated purely based on the local context (see Evaluable).