com.apple.foundationdb.record.query.plan.temp

Enum ComparisonRange.Type

java.lang.Object

java.lang.Enum<ComparisonRange.Type>

com.apple.foundationdb.record.query.plan.temp.ComparisonRange.Type

All Implemented Interfaces:

Serializable, Comparable<ComparisonRange.Type>

Enclosing class:

ComparisonRange

public static enum ComparisonRange.Type
extends Enum<ComparisonRange.Type>

Comparison ranges can be divided into three types, with distinct planning behaviour:

• Empty ranges, to which any comparison can be added.
• Equality ranges, to which only the same (equality) comparison can be added.
• Inequality ranges, to which any other comparison can be added.

This behavior is defined in ComparisonRange.tryToAdd(Comparisons.Comparison).

Furthermore, the planner uses this trichotomy of range types to determine other planning behavior. For example, an index scan must involve (from left to right) any number of equality ranges on the fields, followed by a single, optional inequality range, followed by any number of empty ranges.

Enum Constant Summary

Enum Constants

Enum Constant and Description
EMPTY
EQUALITY
INEQUALITY

Method Summary

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

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

EMPTY

public static final ComparisonRange.Type EMPTY

EQUALITY

public static final ComparisonRange.Type EQUALITY

INEQUALITY

public static final ComparisonRange.Type INEQUALITY

Method Detail

values

public static ComparisonRange.Type[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (ComparisonRange.Type c : ComparisonRange.Type.values())
    System.out.println(c);

Returns:

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

valueOf

public static ComparisonRange.Type valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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 type has no constant with the specified name

NullPointerException - if the argument is null