EventContext (Tapestry API - 5.8.7)

All Known Implementing Classes:

AbstractEventContext, ArrayEventContext, EmptyEventContext, URLEventContext
```
public interface EventContext
```
A collection of parameters that may eventually be passed to an event handler method. Includes the ability to coerce or encode parameters as needed.

See Also:

TypeCoercer, ValueEncoder

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`<T> T`	`get(java.lang.Class<T> desiredType, int index)`	Extracts a parameter value and coerces or decodes it to the desired type.
`int`	`getCount()`	Returns the number of parameter values that can be extracted.
`boolean`	`isEmpty()`	Returns `true` if this context contains no elements.
`java.lang.String[]`	`toStrings()`	Extracts the value of each context value as a string.
`<T> java.util.Optional<T>`	`tryGet(java.lang.Class<T> desiredType, int index)`	Tries to extract a parameter value and coerces or decodes it to the desired type.

- Method Detail
  - getCount
```
int getCount()
```
    Returns the number of parameter values that can be extracted.
  - isEmpty
```
boolean isEmpty()
```
    Returns true if this context contains no elements.
    
    Since:
    
    5.8.2
  - get
```
<T> T get(java.lang.Class<T> desiredType,
          int index)
```
    Extracts a parameter value and coerces or decodes it to the desired type.
    
    Parameters:
    
    desiredType - the type of value required
    
    index - identifies which parameter value to extract
    
    Returns:
    
    the value extracted and converted or coerced
    
    Throws:
    
    java.lang.RuntimeException - if the value can't be converted or the index is out of range
  - tryGet
```
<T> java.util.Optional<T> tryGet(java.lang.Class<T> desiredType,
                                 int index)
```
    Tries to extract a parameter value and coerces or decodes it to the desired type.
    
    Parameters:
    
    desiredType - the type of value required
    
    index - identifies which parameter value to extract
    
    Returns:
    
    the value extracted and converted or coerced, wrapped in an Optional, or Optional.empty() if index is out of bounds, or the value can't be converted.
    
    Since:
    
    5.8.2
  - toStrings
```
java.lang.String[] toStrings()
```
    Extracts the value of each context value as a string.
    
    Returns:
    
    context values
    
    Since:
    
    5.2.0