edu.wpi.cs.dsrg.xmldb.xat.component.xatrewrite
Class ReWritePositionRules
java.lang.Object
|
+--edu.wpi.cs.dsrg.xmldb.xat.common.visitorpattern.InheritableVisitor
|
+--edu.wpi.cs.dsrg.xmldb.xat.common.visitorpattern.TwoParamVisitor
|
+--edu.wpi.cs.dsrg.xmldb.xat.component.xatrewrite.ReWriteRules
|
+--edu.wpi.cs.dsrg.xmldb.xat.component.xatrewrite.ReWritePositionRules
- public class ReWritePositionRules
- extends ReWriteRules
This Class is used to rewrite the XAT using position rules.
- Since:
- 1.0
Method Summary |
java.lang.Object |
visit(Function parent,
Navigate child)
Rule to eliminate a Position Function node and replace it with a
global position function. |
java.lang.Object |
visit(GroupBy parent,
GroupBy child)
Rule to eliminate a Position Function node and replace it with either a single or
multi step position function. |
java.lang.Object |
visit(GroupBy parent,
Navigate child)
Rule to eliminate a Position Function node and replace it with either a single or
multi step position function. |
Methods inherited from class edu.wpi.cs.dsrg.xmldb.xat.component.xatrewrite.ReWriteRules |
combineSteps,
copyNode,
createString,
deleteAggregate,
deletePartialTagger,
deleteWholeTagger,
dispatch,
dispatch,
dispatch,
evaluateRules,
evaluateRules,
findMatchingNavigationNode,
findMatchingNavigationNode,
getChildren,
getColumnNames,
getStatis,
getVariableTable,
isDebug,
isGatherStatistics,
isUsedAbove,
moveNode,
moveNodeToRoot,
setDebug,
setVariableTable,
swap,
visit,
visit |
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
ReWritePositionRules
public ReWritePositionRules()
- Default ReWritePositionRules constructor.
- Since:
- 1.0
visit
public java.lang.Object visit(Function parent,
Navigate child)
- Rule to eliminate a Position Function node and replace it with a
global position function. In the instance that after decorrelation
a function node still exists, it is because it is a multi-step order
function with root context. Otherwise it would be attached to a groupby
in the decorrelation of the for node.
- Parameters:
parent
- The parent Function operator.child
- The child Navigate operator.- Returns:
- ReWriteResult. The swap flag in ReWriteResult true if the nodes
were swapped, false otherwise.
- Since:
- 1.0
visit
public java.lang.Object visit(GroupBy parent,
GroupBy child)
- Rule to eliminate a Position Function node and replace it with either a single or
multi step position function. It will be a single step if the binding of the nav
is equal to the parameter of the function. Otherwise the binding of the nav will be
an ancestor, and it will be a multi step replace.
- Parameters:
parent
- The parent GroupBy operator.child
- The child GroupBy operator.- Returns:
- ReWriteResult. The swap flag in ReWriteResult true if the nodes
were swapped, false otherwise.
- Since:
- 1.0
visit
public java.lang.Object visit(GroupBy parent,
Navigate child)
- Rule to eliminate a Position Function node and replace it with either a single or
multi step position function. It will be a single step if the binding of the nav
is equal to the parameter of the function. Otherwise the binding of the nav will be
an ancestor, and it will be a multi step replace.
- Parameters:
parent
- The parent GroupBy operator.child
- The child Navigate operator.- Returns:
- ReWriteResult. The swap flag in ReWriteResult true if the nodes
were swapped, false otherwise.
- Since:
- 1.0