com.api.jsonata4java.expressions

Class Expressions

java.lang.Object

com.api.jsonata4java.expressions.Expressions

public class Expressions
extends Object

Constructor Summary

Constructors

Constructor and Description
Expressions(org.antlr.v4.runtime.tree.ParseTree aTree, String anExpression)

Method Summary

Modifier and Type	Method and Description
com.fasterxml.jackson.databind.JsonNode	evaluate(com.fasterxml.jackson.databind.JsonNode rootContext) Evaluate the stored expression against the supplied event and application interface data.
static List<String>	getRefsInExpression(Pattern refPattern, String expression) Returns a list of $something references in the given expression, using the given Pattern object (typically patterns should match on $state or $event)
static Expressions	parse(String mappingExpression)
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Expressions

public Expressions(org.antlr.v4.runtime.tree.ParseTree aTree,
                   String anExpression)

Method Detail

getRefsInExpression

public static List<String> getRefsInExpression(Pattern refPattern,
                                               String expression)

Returns a list of $something references in the given expression, using the given Pattern object (typically patterns should match on $state or $event)

Parameters:

refPattern - reference pattern

expression - expression to be searched for references

Returns:

list of references

parse

public static Expressions parse(String mappingExpression)
                         throws ParseException

Throws:

ParseException

evaluate

public com.fasterxml.jackson.databind.JsonNode evaluate(com.fasterxml.jackson.databind.JsonNode rootContext)
                                                 throws EvaluateException

Evaluate the stored expression against the supplied event and application interface data.

Parameters:

rootContext - bound to root context ($$ and paths that don't start with $event, $state or $instance) when evaluating expressions. May be null.

Returns:

the JsonNode resulting from the expression evaluation against the rootContext

Throws:

EvaluateException - If the given device event is invalid.

toString

public String toString()

Overrides:

toString in class Object