Class Choicepoint
java.lang.Object
com.yahoo.prelude.semantics.engine.Choicepoint
A choice point in an rule evaluation. A choicepoint is open if there are other choices to make at the point,
closed if there are no further choices. In addition it contains enough information to enable
the rule evaluation to backtrack to this point
- Author:
- bratseth
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Nested Class Summary
Modifier and TypeClassDescriptionstatic final class
The state of this choicepoint -
Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
addTry()
Registers that another try has been madevoid
Backtrack to the evaluation state at the point where this choicepoint were instantiated.void
Backtracks the position only, not matchesvoid
close()
Marks this choice point as closed (!open) - there are no further choices to exploreReturns the condition which created this choice pointgetState()
Returns the state of this choice pointboolean
isOpen()
Returns wether there are (or may be) open choices to explore at this choicepoint yetint
tryCount()
Returns the number open tries made at this pointvoid
Updates the state of this choice point to the current state of its evaluation
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Constructor Details
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Choicepoint
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Method Details
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getCondition
Returns the condition which created this choice point -
isOpen
public boolean isOpen()Returns wether there are (or may be) open choices to explore at this choicepoint yet -
close
public void close()Marks this choice point as closed (!open) - there are no further choices to explore -
tryCount
public int tryCount()Returns the number open tries made at this point -
addTry
public void addTry()Registers that another try has been made -
backtrack
public void backtrack()Backtrack to the evaluation state at the point where this choicepoint were instantiated. -
backtrackPosition
public void backtrackPosition()Backtracks the position only, not matches -
updateState
public void updateState()Updates the state of this choice point to the current state of its evaluation -
getState
Returns the state of this choice point
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