Package software.amazon.smithy.rulesengine.language.eval

Class RuleEvaluator

java.lang.Object

software.amazon.smithy.rulesengine.language.eval.RuleEvaluator

All Implemented Interfaces:

ExpressionVisitor<Value>

public class RuleEvaluator
extends java.lang.Object
implements ExpressionVisitor<Value>

A runtime implementation of a rule-set evaluation engine.

Nested Class Summary

Nested classes/interfaces inherited from interface software.amazon.smithy.rulesengine.language.visit.ExpressionVisitor

ExpressionVisitor.Default<R>

Constructor Summary

Constructors

Constructor	Description
RuleEvaluator()

Method Summary

Modifier and Type	Method	Description
static Value	evaluate(EndpointRuleSet ruleset, java.util.Map<Identifier,Value> parameterArguments)	Initializes a new RuleEvaluator instances, and evaluates the provided ruleset and parameter arguments.
Value	evaluateCondition(Condition condition)
Value	evaluateRuleSet(EndpointRuleSet ruleset, java.util.Map<Identifier,Value> parameterArguments)	Evaluate the provided ruleset and parameter arguments.
Value	visitBoolEquals(Expression left, Expression right)
Value	visitEndpointRule(Endpoint endpoint)
Value	visitErrorRule(Expression error)
Value	visitGetAttr(GetAttr getAttr)
Value	visitIsSet(Expression fn)
Value	visitLibraryFunction(FunctionDefinition definition, java.util.List<Expression> arguments)
Value	visitLiteral(Literal literal)
Value	visitNot(Expression not)
Value	visitRef(Reference reference)
Value	visitStringEquals(Expression left, Expression right)

Methods inherited from class java.lang.Object

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

Constructor Detail

RuleEvaluator

public RuleEvaluator()

Method Detail

evaluate

public static Value evaluate(EndpointRuleSet ruleset,
                             java.util.Map<Identifier,Value> parameterArguments)

Initializes a new RuleEvaluator instances, and evaluates the provided ruleset and parameter arguments.

Parameters:

ruleset - The endpoint ruleset.

parameterArguments - The rule-set parameter identifiers and values to evaluate the rule-set against.

Returns:

The resulting value from the final matched rule.

evaluateRuleSet

public Value evaluateRuleSet(EndpointRuleSet ruleset,
                             java.util.Map<Identifier,Value> parameterArguments)

Evaluate the provided ruleset and parameter arguments.

Parameters:

ruleset - The endpoint ruleset.

parameterArguments - The rule-set parameter identifiers and values to evaluate the rule-set against.

Returns:

The resulting value from the final matched rule.

visitLiteral

public Value visitLiteral(Literal literal)

Specified by:

visitLiteral in interface ExpressionVisitor<Value>

visitRef

public Value visitRef(Reference reference)

Specified by:

visitRef in interface ExpressionVisitor<Value>

visitIsSet

public Value visitIsSet(Expression fn)

Specified by:

visitIsSet in interface ExpressionVisitor<Value>

visitNot

public Value visitNot(Expression not)

Specified by:

visitNot in interface ExpressionVisitor<Value>

visitBoolEquals

public Value visitBoolEquals(Expression left,
                             Expression right)

Specified by:

visitBoolEquals in interface ExpressionVisitor<Value>

visitStringEquals

public Value visitStringEquals(Expression left,
                               Expression right)

Specified by:

visitStringEquals in interface ExpressionVisitor<Value>

visitGetAttr

public Value visitGetAttr(GetAttr getAttr)

Specified by:

visitGetAttr in interface ExpressionVisitor<Value>

visitLibraryFunction

public Value visitLibraryFunction(FunctionDefinition definition,
                                  java.util.List<Expression> arguments)

Specified by:

visitLibraryFunction in interface ExpressionVisitor<Value>

visitErrorRule

public Value visitErrorRule(Expression error)

visitEndpointRule

public Value visitEndpointRule(Endpoint endpoint)

evaluateCondition

public Value evaluateCondition(Condition condition)