org.optaplanner.core.api.domain.variable
Enum PlanningVariableGraphType
java.lang.Object
java.lang.Enum<PlanningVariableGraphType>
org.optaplanner.core.api.domain.variable.PlanningVariableGraphType
- All Implemented Interfaces:
- Serializable, Comparable<PlanningVariableGraphType>
public enum PlanningVariableGraphType
- extends Enum<PlanningVariableGraphType>
Enum Constant Summary |
CHAINED
Changes to this variable need to trigger chain correction. |
NONE
This is de default. |
NONE
public static final PlanningVariableGraphType NONE
- This is de default.
CHAINED
public static final PlanningVariableGraphType CHAINED
- Changes to this variable need to trigger chain correction.
In some use cases, such as Vehicle Routing, planning entities are chained.
A chained variable recursively points to a planning fact, which is called the anchor.
So either it points directly to the anchor (that planning fact)
or it points to another planning entity which recursively points to the anchor.
Chains always have exactly 1 anchor, thus they never loop and the tail is always open.
Chains never split into a tree: a anchor or planning entity has at most 1 trailing planning entity.
When a chained planning entity changes position, then chain correction must happen:
- divert the chain link at the new position to go through the modified planning entity
- close the missing chain link at the old position
For example: Given A <- B <- C <- D <- X <- Y, when B moves between X and Y, pointing to X,
then Y is also changed to point to B
and C is also changed to point to A,
giving the result A <- C <- D <- X <- B <- Y.
PlanningVariable.nullable()
true is not compatible with this.
values
public static PlanningVariableGraphType[] 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 (PlanningVariableGraphType c : PlanningVariableGraphType.values())
System.out.println(c);
- Returns:
- an array containing the constants of this enum type, in
the order they are declared
valueOf
public static PlanningVariableGraphType 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
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