Package com.api.jsonata4java.expressions.functions

Class KeysFunction

java.lang.Object

com.api.jsonata4java.expressions.functions.FunctionBase

com.api.jsonata4java.expressions.functions.KeysFunction

All Implemented Interfaces:

Function, Serializable

public class KeysFunction
extends FunctionBase
implements Function

From http://docs.jsonata.org/object-functions.html $keys(object) Returns the keys in an array of Strings. It is an error if the input is not an object. Example $keys({"a":1,"b":2})==["a", "b"]

See Also:

Serialized Form

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
KeysFunction()

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

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

Constructor Detail

KeysFunction

public KeysFunction()

Method Detail

invoke

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

Specified by:

invoke in interface Function

getMaxArgs

public int getMaxArgs()

Specified by:

getMaxArgs in interface Function

getMinArgs

public int getMinArgs()

Specified by:

getMinArgs in interface Function

getSignature

public String getSignature()

Specified by:

getSignature in interface Function