org.apache.jena.reasoner.rulesys.impl

Class EnvironmentFrame

java.lang.Object

org.apache.jena.reasoner.rulesys.impl.FrameObject

org.apache.jena.reasoner.rulesys.impl.EnvironmentFrame

Direct Known Subclasses:

EnvironmentFrameWithDerivation

public class EnvironmentFrame
extends FrameObject

Represents a single frame in the LP interpreter's environment stack. The environment stack represents the AND part of the search tree - it is a sequence of nested predicate calls.

This is used in the inner loop of the interpreter and so is a pure data structure not an abstract data type and assumes privileged access to the interpreter state.

Constructor Summary

Constructors

Constructor and Description
EnvironmentFrame(RuleClauseCode clause) Constructor

Method Summary

Modifier and Type	Method and Description
void	allocate(int n) Allocate a vector of permanent variables for use in the rule execution.
Rule	getRule() Return the rule associated with this environment, null if no such rule.
String	toString() Printable string for debugging.

Methods inherited from class org.apache.jena.reasoner.rulesys.impl.FrameObject

close, fastLinkTo, getLink, linkTo

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

EnvironmentFrame

public EnvironmentFrame(RuleClauseCode clause)

Constructor

Parameters:

clause - the compiled code being interpreted by this env frame

Method Detail

allocate

public void allocate(int n)

Allocate a vector of permanent variables for use in the rule execution.

getRule

public Rule getRule()

Return the rule associated with this environment, null if no such rule.

toString

public String toString()

Printable string for debugging.

Overrides:

toString in class Object