java.lang.Object
- org.apache.wayang.core.optimizer.OptimizationContext.LoopContext

Enclosing class:

OptimizationContext
```
public class OptimizationContext.LoopContext
extends java.lang.Object
```
Maintains OptimizationContexts for the iterations of a LoopSubplan.

Constructor Summary

Constructors
Modifier Constructor Description

protected LoopContext(OptimizationContext.OperatorContext loopSubplanContext)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`OptimizationContext`	`appendIterationContext()`	Add a new iteration `OptimizationContext` between second-to-last and final iteration.
`AggregateOptimizationContext`	`getAggregateContext()`
`OptimizationContext`	`getFinalIterationContext()`
`OptimizationContext`	`getInitialIterationContext()`
`OptimizationContext`	`getIterationContext(int iteration)`
`java.util.List<OptimizationContext>`	`getIterationContexts()`	Retrieves the iteration `OptimizationContext`s.
`LoopSubplan`	`getLoop()`
`OptimizationContext.OperatorContext`	`getLoopSubplanContext()`
`OptimizationContext`	`getOptimizationContext()`

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

- Constructor Detail
  - LoopContext
```
protected LoopContext(OptimizationContext.OperatorContext loopSubplanContext)
```
- Method Detail
  - getLoopSubplanContext
```
public OptimizationContext.OperatorContext getLoopSubplanContext()
```
  - getIterationContexts
```
public java.util.List<OptimizationContext> getIterationContexts()
```
    Retrieves the iteration OptimizationContexts.
    
    Note that for n iterations, there are n+1 OptimizationContexts because the LoopHeadOperator is triggered n+1 times. The first n represent the iterations, the final represents the final state of the loop, in which only the LoopHeadOperator is run the last time.
    
    Returns:
    
    the OptimizationContext for each iteration; order by execution order
  - getIterationContext
```
public OptimizationContext getIterationContext(int iteration)
```
  - getOptimizationContext
```
public OptimizationContext getOptimizationContext()
```
    Returns:
    
    the OptimizationContext in that the LoopSubplan resides
  - getInitialIterationContext
```
public OptimizationContext getInitialIterationContext()
```
  - getFinalIterationContext
```
public OptimizationContext getFinalIterationContext()
```
  - appendIterationContext
```
public OptimizationContext appendIterationContext()
```
    Add a new iteration OptimizationContext between second-to-last and final iteration.
    
    Returns:
    
    the added OptimizationContext
  - getLoop
```
public LoopSubplan getLoop()
```
  - getAggregateContext
```
public AggregateOptimizationContext getAggregateContext()
```

Class OptimizationContext.LoopContext

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

LoopContext

Method Detail

getLoopSubplanContext

getIterationContexts

getIterationContext

getOptimizationContext

getInitialIterationContext

getFinalIterationContext

appendIterationContext

getLoop

getAggregateContext