Package org.gcube.informationsystem.resourceregistry.queries.operators

Enum Class FieldOperator

java.lang.Object

java.lang.Enum<FieldOperator>

org.gcube.informationsystem.resourceregistry.queries.operators.FieldOperator

All Implemented Interfaces:

Serializable, Comparable<FieldOperator>, Constable

public enum FieldOperator
extends Enum<FieldOperator>

Author:

Luca Frosini (ISTI - CNR) Methods: also called "Field Operators" SQL Methods are similar to SQL functions but they apply to values. In Object Oriented paradigm they are called "methods", as functions related to a class. So what's the difference between a function and a method? This is a SQL function: SELECT sum( salary ) FROM employee This is a SQL method: SELECT salary.toJSON() FROM employee As you can see the method is executed against a field/value. Methods can receive parameters, like functions. You can concatenate N operators in sequence. See https://orientdb.com/docs/3.0.x/sql/SQL-Where.html#methods http://orientdb.com/docs/3.0.x/sql/SQL-Methods.html

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Method Summary

Modifier and Type	Method	Description
static FieldOperator	valueOf(String name)	Returns the enum constant of this class with the specified name.
static FieldOperator[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Method Details

values

public static FieldOperator[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static FieldOperator valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null