EventState (Apache Commons Math 3.6.1 API)

java.lang.Object
- org.apache.commons.math3.ode.events.EventState

```
public class EventState
extends Object
```
This class handles the state for one event handler during integration steps.
Each time the integrator proposes a step, the event handler switching function should be checked. This class handles the state of one handler during one integration step, with references to the state at the end of the preceding step. This information is used to decide if the handler should trigger an event or not during the proposed step.

Since:

1.2

Constructor Summary

Constructors
Constructor and Description
`EventState(EventHandler handler, double maxCheckInterval, double convergence, int maxIterationCount, UnivariateSolver solver)` Simple constructor.

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`evaluateStep(StepInterpolator interpolator)` Evaluate the impact of the proposed step on the event handler.
`double`	`getConvergence()` Get the convergence threshold for event localization.
`EventHandler`	`getEventHandler()` Get the underlying event handler.
`double`	`getEventTime()` Get the occurrence time of the event triggered in the current step.
`double`	`getMaxCheckInterval()` Get the maximal time interval between events handler checks.
`int`	`getMaxIterationCount()` Get the upper limit in the iteration count for event localization.
`void`	`reinitializeBegin(StepInterpolator interpolator)` Reinitialize the beginning of the step.
`boolean`	`reset(double t, double[] y)` Let the event handler reset the state if it wants.
`void`	`setExpandable(ExpandableStatefulODE expandable)` Set the equation.
`void`	`stepAccepted(double t, double[] y)` Acknowledge the fact the step has been accepted by the integrator.
`boolean`	`stop()` Check if the integration should be stopped at the end of the current step.

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

- Constructor Detail
  - EventState
```
public EventState(EventHandler handler,
          double maxCheckInterval,
          double convergence,
          int maxIterationCount,
          UnivariateSolver solver)
```
    Simple constructor.
    
    Parameters:
    handler - event handler
    maxCheckInterval - maximal time interval between switching function checks (this interval prevents missing sign changes in case the integration steps becomes very large)
    convergence - convergence threshold in the event time search
    maxIterationCount - upper limit of the iteration count in the event time search
    solver - Root-finding algorithm to use to detect state events
- Method Detail
  - getEventHandler
```
public EventHandler getEventHandler()
```
    Get the underlying event handler.
    
    Returns:
    underlying event handler
  - setExpandable
```
public void setExpandable(ExpandableStatefulODE expandable)
```
    Set the equation.
    
    Parameters:
    expandable - equation being integrated
  - getMaxCheckInterval
```
public double getMaxCheckInterval()
```
    Get the maximal time interval between events handler checks.
    
    Returns:
    maximal time interval between events handler checks
  - getConvergence
```
public double getConvergence()
```
    Get the convergence threshold for event localization.
    
    Returns:
    convergence threshold for event localization
  - getMaxIterationCount
```
public int getMaxIterationCount()
```
    Get the upper limit in the iteration count for event localization.
    
    Returns:
    upper limit in the iteration count for event localization
  - reinitializeBegin
```
public void reinitializeBegin(StepInterpolator interpolator)
                       throws MaxCountExceededException
```
    Reinitialize the beginning of the step.
    
    Parameters:
    interpolator - valid for the current step
    
    Throws:
    
    MaxCountExceededException - if the interpolator throws one because the number of functions evaluations is exceeded
  - evaluateStep
```
public boolean evaluateStep(StepInterpolator interpolator)
                     throws MaxCountExceededException,
                            NoBracketingException
```
    Evaluate the impact of the proposed step on the event handler.
    
    Parameters:
    interpolator - step interpolator for the proposed step
    
    Returns:
    true if the event handler triggers an event before the end of the proposed step
    
    Throws:
    
    MaxCountExceededException - if the interpolator throws one because the number of functions evaluations is exceeded
    
    NoBracketingException - if the event cannot be bracketed
  - getEventTime
```
public double getEventTime()
```
    Get the occurrence time of the event triggered in the current step.
    
    Returns:
    occurrence time of the event triggered in the current step or infinity if no events are triggered
  - stepAccepted
```
public void stepAccepted(double t,
                double[] y)
```
    Acknowledge the fact the step has been accepted by the integrator.
    
    Parameters:
    t - value of the independent time variable at the end of the step
    y - array containing the current value of the state vector at the end of the step
  - stop
```
public boolean stop()
```
    Check if the integration should be stopped at the end of the current step.
    
    Returns:
    true if the integration should be stopped
  - reset
```
public boolean reset(double t,
            double[] y)
```
    Let the event handler reset the state if it wants.
    
    Parameters:
    t - value of the independent time variable at the beginning of the next step
    y - array were to put the desired state vector at the beginning of the next step
    
    Returns:
    true if the integrator should reset the derivatives too

Class EventState

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

EventState

Method Detail

getEventHandler

setExpandable

getMaxCheckInterval

getConvergence

getMaxIterationCount

reinitializeBegin

evaluateStep

getEventTime

stepAccepted

stop

reset