Choicepoint (container-search 7.527.20 API)

java.lang.Object
- com.yahoo.prelude.semantics.engine.Choicepoint

```
public class Choicepoint
extends Object
```
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

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class Choicepoint.State
The state of this choicepoint

Constructor Summary

Constructors
Constructor Description

Choicepoint(RuleEvaluation e, Condition condition)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addTry()`	Registers that another try has been made
`void`	`backtrack()`	Backtrack to the evaluation state at the point where this choicepoint were instantiated.
`void`	`backtrackPosition()`	Backtracks the position only, not matches
`void`	`close()`	Marks this choice point as closed (!open) - there are no further choices to explore
`Condition`	`getCondition()`	Returns the condition which created this choice point
`Choicepoint.State`	`getState()`	Returns the state of this choice point
`boolean`	`isOpen()`	Returns wether there are (or may be) open choices to explore at this choicepoint yet
`int`	`tryCount()`	Returns the number open tries made at this point
`void`	`updateState()`	Updates the state of this choice point to the current state of its evaluation

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Choicepoint
```
public Choicepoint(RuleEvaluation e,
                   Condition condition)
```
- Method Detail
  - getCondition
```
public Condition 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
```
public Choicepoint.State getState()
```
    Returns the state of this choice point