Package com.api.jsonata4java.expressions.functions

Class LookupFunction

java.lang.Object

com.api.jsonata4java.expressions.functions.FunctionBase

com.api.jsonata4java.expressions.functions.LookupFunction

public class LookupFunction
extends FunctionBase

From http://docs.jsonata.org/object-functions.html $lookup(object,key) Returns the value corresponding to the key in the supplied object. It is an error if the input is not an object, and if the key is not a String. Example $lookup({"a":1,"b":2},"b")==2

Nested Class Summary

Nested classes/interfaces inherited from class com.api.jsonata4java.expressions.functions.FunctionBase

FunctionBase.CtxEvalResult

Field Summary

Fields

Modifier and Type	Field	Description
static String	ERR_ARG1BADTYPE
static String	ERR_ARG2BADTYPE
static String	ERR_ARG3BADTYPE
static String	ERR_BAD_CONTEXT

Constructor Summary

Constructors

Constructor	Description
LookupFunction()

Method Summary

Modifier and Type	Method	Description
int	getMaxArgs()
int	getMinArgs()
String	getSignature()
com.fasterxml.jackson.databind.JsonNode	invoke(ExpressionsVisitor expressionVisitor, MappingExpressionParser.Function_callContext ctx)

Methods inherited from class com.api.jsonata4java.expressions.functions.FunctionBase

evalContext, getArgumentCount, getFunctionName

Methods inherited from class java.lang.Object

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

Field Detail

ERR_BAD_CONTEXT

public static String ERR_BAD_CONTEXT

ERR_ARG1BADTYPE

public static String ERR_ARG1BADTYPE

ERR_ARG2BADTYPE

public static String ERR_ARG2BADTYPE

ERR_ARG3BADTYPE

public static String ERR_ARG3BADTYPE

Constructor Detail

LookupFunction

public LookupFunction()

Method Detail

invoke

public com.fasterxml.jackson.databind.JsonNode invoke(ExpressionsVisitor expressionVisitor,
                                                      MappingExpressionParser.Function_callContext ctx)

Specified by:

invoke in class FunctionBase

getMaxArgs

public int getMaxArgs()

Specified by:

getMaxArgs in class FunctionBase

getMinArgs

public int getMinArgs()

Specified by:

getMinArgs in class FunctionBase

getSignature

public String getSignature()

Specified by:

getSignature in class FunctionBase