Package se.liu.ida.hefquin.engine.queryplan.physical.impl

Class PhysicalOpRequest<ReqType extends DataRetrievalRequest,MemberType extends FederationMember>

java.lang.Object

se.liu.ida.hefquin.engine.queryplan.physical.impl.BaseForPhysicalOps

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

All Implemented Interfaces:

NullaryPhysicalOp, NullaryPhysicalOpForLogicalOp, PhysicalOperator, PhysicalOperatorForLogicalOperator

public class PhysicalOpRequest<ReqType extends DataRetrievalRequest,MemberType extends FederationMember>
extends BaseForPhysicalOps
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.

• ExecOpRequestTPFatTPFServer
• ExecOpRequestTPFatBRTPFServer
• ExecOpRequestBRTPF
• ExecOpRequestSPARQL

Field Summary

Fields

Modifier and Type	Field	Description
protected final LogicalOpRequest<ReqType,MemberType>	lop

Fields inherited from class se.liu.ida.hefquin.engine.queryplan.physical.impl.BaseForPhysicalOps

id

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
NullaryExecutableOp	createExecOp(boolean collectExceptions, ExpectedVariables... inputVars)	Creates and returns the executable operator to be used for this physical operator.
boolean	equals(Object o)
ExpectedVariables	getExpectedVariables(ExpectedVariables... inputVars)	Returns the variables that can be expected in the solution mappings produced by this operator if the input(s) to this operator contain solutions mappings with the given set(s) of variables.
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 se.liu.ida.hefquin.engine.queryplan.physical.impl.BaseForPhysicalOps

getID

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.PhysicalOperator

getID

Field Details

lop

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

Constructor Details

PhysicalOpRequest

public PhysicalOpRequest(LogicalOpRequest<ReqType,MemberType> lop)

Method Details

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

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,
 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 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

getExpectedVariables

public ExpectedVariables getExpectedVariables(ExpectedVariables... inputVars)

Description copied from interface: PhysicalOperator

Returns the variables that can be expected in the solution mappings produced by this operator if the input(s) to this operator contain solutions mappings with the given set(s) of variables. The number of ExpectedVariables objects passed 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:

getExpectedVariables in interface PhysicalOperator

visit

public void visit(PhysicalPlanVisitor visitor)

Specified by:

visit in interface PhysicalOperator

toString

public String toString()

Overrides:

toString in class Object