Package org.openrefine.grel.ast

Class OperatorCallExpr

java.lang.Object

org.openrefine.grel.ast.PureArgumentsExpr

org.openrefine.grel.ast.OperatorCallExpr

All Implemented Interfaces:

Serializable, GrelExpr

public class OperatorCallExpr
extends PureArgumentsExpr

An abstract syntax tree node encapsulating an operator call, such as "+".

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected String	_op

Fields inherited from class org.openrefine.grel.ast.PureArgumentsExpr

_args

Constructor Summary

Constructors

Constructor	Description
OperatorCallExpr(GrelExpr[] args, String op)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object other)
Object	evaluate(Properties bindings)	Returns the value of the expression in a given context.
OperatorCallExpr	renameColumnDependencies(Map<String,String> substitutions)	Translates this expression by simultaneously substituting column names as the supplied map specifies.
String	toString()	For GREL expressions, toString should return the source code of the expression, or a source code for an equivalent expression.

Methods inherited from class org.openrefine.grel.ast.PureArgumentsExpr

getColumnDependencies, isLocal

Methods inherited from class java.lang.Object

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

Field Detail

_op

protected final String _op

Constructor Detail

OperatorCallExpr

public OperatorCallExpr(GrelExpr[] args,
                        String op)

Method Detail

evaluate

public Object evaluate(Properties bindings)

Description copied from interface: GrelExpr

Returns the value of the expression in a given context.

Parameters:

bindings - the evaluation context, mapping variable names to their values

Returns:

the result of the evaluation of the expression

toString

public String toString()

Description copied from interface: GrelExpr

For GREL expressions, toString should return the source code of the expression, or a source code for an equivalent expression. (without the "grel:" prefix).

Specified by:

toString in interface GrelExpr

Overrides:

toString in class Object

equals

public boolean equals(Object other)

Overrides:

equals in class Object

renameColumnDependencies

public OperatorCallExpr renameColumnDependencies(Map<String,String> substitutions)

Description copied from interface: GrelExpr

Translates this expression by simultaneously substituting column names as the supplied map specifies.

This is only possible if the extraction of column dependencies with GrelExpr.getColumnDependencies(String) succeeds (return a non-null value).

Parameters:

substitutions - a map specifying new names for some columns. If a column name is not present in the map, it is assumed that the column is not renamed.

Returns:

a new expression with updated column names.