Package nz.org.riskscape.pipeline.ast

Class ParameterReplacer

java.lang.Object

nz.org.riskscape.rl.ast.ExpressionConverter<List<ParameterToken>>

nz.org.riskscape.pipeline.ast.ParameterReplacer

All Implemented Interfaces:

ExpressionVisitor<List<ParameterToken>,Expression>

public class ParameterReplacer
extends ExpressionConverter<List<ParameterToken>>

An ExpressionVisitor that rewrites an expression by replacing any parameters it has found with substitutions from the visitor's map of replacements.

Constructor Summary

Constructors

Constructor	Description
ParameterReplacer(Map<ParameterToken,Expression> replacements)	Creates a new ParameterReplacer instance.

Method Summary

Modifier and Type	Method	Description
Map<ParameterToken,Expression>	getReplacements()	A map of ParameterToken to Expressions that are used to rewrite expressions.
Expression	visit(ParameterToken parameterToken, List<ParameterToken> missing)

Methods inherited from class nz.org.riskscape.rl.ast.ExpressionConverter

visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Details

ParameterReplacer

public ParameterReplacer(Map<ParameterToken,Expression> replacements)

Creates a new ParameterReplacer instance.

Parameters:

replacements - A map of ParameterToken to Expressions that are used to rewrite expressions. Whenever a ParameterToken is found in the expression being visited, this map is queried for the found ParameterToken and the mapped Expression replaces the found ParameterToken.

E.g. The expression foo($bar, baz) + $barry would change to foo(bar_replacement(), baz) + $barry if the replacements map was {$bar: bar_replacement()}

Method Details

visit

public Expression visit(ParameterToken parameterToken,
 List<ParameterToken> missing)

Specified by:

visit in interface ExpressionVisitor<List<ParameterToken>,Expression>

Overrides:

visit in class ExpressionConverter<List<ParameterToken>>

getReplacements

public Map<ParameterToken,Expression> getReplacements()

A map of ParameterToken to Expressions that are used to rewrite expressions. Whenever a ParameterToken is found in the expression being visited, this map is queried for the found ParameterToken and the mapped Expression replaces the found ParameterToken.

E.g. The expression foo($bar, baz) + $barry would change to foo(bar_replacement(), baz) + $barry if the replacements map was {$bar: bar_replacement()}