Class PhysicalOpRequest<ReqType extends DataRetrievalRequest,MemberType extends FederationMember>

java.lang.Object

se.liu.ida.hefquin.engine.queryplan.physical.impl.PhysicalOpRequest<ReqType,MemberType>

All Implemented Interfaces:

QueryPlanOperator, NullaryPhysicalOp, NullaryPhysicalOpForLogicalOp, PhysicalOperator, PhysicalOperatorForLogicalOperator

public class PhysicalOpRequest<ReqType extends DataRetrievalRequest,MemberType extends FederationMember>
extends Object
implements NullaryPhysicalOpForLogicalOp

A physical operator that performs a request at a federation member and, then, outputs the solution mappings obtained via this request. The actual algorithm of this operator is implemented in the following classes, where each of them is specific to a different type of request and federation member.

• ExecOpRequestTPF
• ExecOpRequestBRTPF
• ExecOpRequestSPARQL
• ExecOpRequestOther

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	PhysicalOpRequest.Factory

Field Summary

Fields

Modifier and Type	Field	Description
protected static final PhysicalOpRequest.Factory	factory
protected final LogicalOpRequest<ReqType,MemberType>	lop

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	PhysicalOpRequest(LogicalOpRequest<ReqType,MemberType> lop)

Method Summary

Modifier and Type	Method	Description
NullaryExecutableOp	createExecOp(boolean collectExceptions, QueryPlanningInfo qpInfo, ExpectedVariables... inputVars)	Creates and returns the executable operator to be used for this physical operator.
boolean	equals(Object o)
static PhysicalOpFactory	getFactory()
LogicalOpRequest<ReqType,MemberType>	getLogicalOperator()	Returns the logical operator implemented by this physical operator.
int	hashCode()
String	toString()
void	visit(PhysicalPlanVisitor visitor)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface se.liu.ida.hefquin.engine.queryplan.physical.PhysicalOperatorForLogicalOperator

getExpectedVariables

Field Details

factory

protected static final PhysicalOpRequest.Factory factory

lop

protected final LogicalOpRequest<ReqType extends DataRetrievalRequest,MemberType extends FederationMember> lop

Constructor Details

PhysicalOpRequest

protected PhysicalOpRequest(LogicalOpRequest<ReqType,MemberType> lop)

Method Details

getFactory

public static PhysicalOpFactory getFactory()

getLogicalOperator

public LogicalOpRequest<ReqType,MemberType> getLogicalOperator()

Description copied from interface: PhysicalOperatorForLogicalOperator

Returns the logical operator implemented by this physical operator.

Specified by:

getLogicalOperator in interface NullaryPhysicalOpForLogicalOp

Specified by:

getLogicalOperator in interface PhysicalOperatorForLogicalOperator

createExecOp

public NullaryExecutableOp createExecOp(boolean collectExceptions,
 QueryPlanningInfo qpInfo,
 ExpectedVariables... inputVars)

Description copied from interface: PhysicalOperator

Creates and returns the executable operator to be used for this physical operator. The implementation of this method has to create a new ExecutableOperator object each time it is called. The given QueryPlanningInfo object is passed to the created executable operator (to be available via the ExecutableOperator.getQueryPlanningInfo() method) and should be taken from the physical plan whose root operator is this physical operator. The given collectExceptions flag is passed to the executable operator and determines whether that operator collects its exceptions (see ExecutableOperator.getExceptionsCaughtDuringExecution()) or throws them immediately. The number of ExpectedVariables objects passed as arguments to this method must be in line with the degree of this operator (e.g., for a unary operator, exactly one such object must be passed).

Specified by:

createExecOp in interface NullaryPhysicalOp

Specified by:

createExecOp in interface PhysicalOperator

visit

public void visit(PhysicalPlanVisitor visitor)

Specified by:

visit in interface PhysicalOperator

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object