org.aksw.limes.core.execution.planning.planner

Class LigerPlanner

java.lang.Object

org.aksw.limes.core.execution.planning.planner.Planner

org.aksw.limes.core.execution.planning.planner.LigerPlanner

All Implemented Interfaces:

IPlanner

public class LigerPlanner
extends Planner

Implements a planner class used by the partial recall execution engine class. It receives a link specification as input and generates an immutable NestedPlan. This planner has the same functionality as the Canonical planner, but updates information regarding the runtime and selectivity of the generated plan of the link specification and its sub-specifications. It is only to be used by the partial recall execution engine class during the production of the best subsumed link specification. Instances of the LigerPlanner can not and should not be created via a configuration file or the EngineFactory.

Version:

1.0

Author:

Kleanthi Georgala (georgala@informatik.uni-leipzig.de)

Field Summary

Fields

Modifier and Type	Field and Description
IMapper.Language	lang Language of the source/target data.
ACache	source Source cache.
ACache	target Target cache.

Constructor Summary

Constructors

Constructor and Description
LigerPlanner(ACache source, ACache target) Constructor of the Helios planner class.

Method Summary

Modifier and Type	Method and Description
boolean	isStatic() Returns the status of the planner.
LinkSpecification	normalize(LinkSpecification spec) Normalization of input link specification.
NestedPlan	plan(LinkSpecification spec) Generates a NestedPlan for a link specification.

Methods inherited from class java.lang.Object

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

Field Detail

source

public ACache source

Source cache.

target

public ACache target

Target cache.

lang

public IMapper.Language lang

Language of the source/target data.

Constructor Detail

LigerPlanner

public LigerPlanner(ACache source,
                    ACache target)

Constructor of the Helios planner class.

Parameters:

source - Source cache

target - Target get

Method Detail

plan

public NestedPlan plan(LinkSpecification spec)

Generates a NestedPlan for a link specification. If the link specification is null or empty it returns an empty plan. If the link specification is atomic, the planner generates a simple plan that consists of one RUN instruction. If the link specification is complex, firstly it generates a plan for each of the children specifications and sets them as subPlans. Then, it assigns to the plan the corresponding command based on the link specification operator and finally creates a filtering instruction using the filtering expression and threshold of the input link specification.

Parameters:

spec - Input link specification

Returns:

a NestedPlan of the input link specification

isStatic

public boolean isStatic()

Description copied from interface: IPlanner

Returns the status of the planner.

Returns:

true if the planner is static or false if it is dynamic

normalize

public LinkSpecification normalize(LinkSpecification spec)

Description copied from interface: IPlanner

Normalization of input link specification.

Parameters:

spec - The link specification to normalize

Returns:

the normalized link specification