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.
com.fasterxml.jackson.databind.JsonNode	evaluate(com.fasterxml.jackson.databind.JsonNode rootContext, long timeoutMS, int maxDepth) Evaluate the stored expression against the supplied event and application interface data.
ExpressionsVisitor	getExpr()
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)
org.antlr.v4.runtime.tree.ParseTree	getTree()
static Expressions	parse(String mappingExpression)
void	setExpr(ExpressionsVisitor expr)
void	setTree(org.antlr.v4.runtime.tree.ParseTree parsetree)
void	timeboxExpression(long timeoutMS, int maxDepth)
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,
                                IOException

Throws:

ParseException

IOException

evaluate

public com.fasterxml.jackson.databind.JsonNode evaluate(com.fasterxml.jackson.databind.JsonNode rootContext,
                                                        long timeoutMS,
                                                        int maxDepth)
                                                 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.

timeoutMS - milliseconds allowed for the evaluation to occur. If it takes longer an exception is thrown. Must be positive number or exception is thrown.

maxDepth - the maximum call stack depth allowed before an exception is thrown. Must be a positive number or an exception is thrown.

Returns:

the JsonNode resulting from the expression evaluation against the rootContext

Throws:

EvaluateException - If the given device event is invalid.

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.

getExpr

public ExpressionsVisitor getExpr()

setExpr

public void setExpr(ExpressionsVisitor expr)

getTree

public org.antlr.v4.runtime.tree.ParseTree getTree()

setTree

public void setTree(org.antlr.v4.runtime.tree.ParseTree parsetree)

timeboxExpression

public void timeboxExpression(long timeoutMS,
                              int maxDepth)

toString

public String toString()

Overrides:

toString in class Object