org.apache.tapestry5.plastic

## Interface MethodInvocation

- All Superinterfaces:
    AnnotationAccess, MethodInvocationResult
  All Known Implementing Classes:
    AbstractMethodInvocation

      public interface MethodInvocation
      extends MethodInvocationResult, AnnotationAccess

  A representation of the invocation of a method that allows the behavior of the method to be advised: either by changing parameter values, or by changing the return value, or by catch or throwing different exceptions. Provides access to annotations on the advised method.
  See Also:
    `MethodAdvice`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `getInstance()` The instance on which the method was originally invoked.
    `InstanceContext` | `getInstanceContext()`
    `Method` | `getMethod()` Returns the method being invoked.
    `Object` | `getParameter(int index)` Returns the parameter at the given index.
    `MethodInvocation` | `proceed()` Proceed with the method invocation, either chaining into the next `MethodAdvice` added to the method, or ultimately into the actual method implementation.
    `MethodInvocation` | `setCheckedException(Exception exception)` Sets the checked exception; this can be used to indicate failure for the method, or to cancel the thrown exception (by setting the exception to null).
    `MethodInvocation` | `setParameter(int index, Object newValue)` Changes a parameter value.
    `MethodInvocation` | `setReturnValue(Object returnValue)` Overrides the return value of the method.

    - ### Methods inherited from interface org.apache.tapestry5.plastic.MethodInvocationResult

      `didThrowCheckedException, getCheckedException, getReturnValue, rethrow`

    - ### Methods inherited from interface org.apache.tapestry5.plastic.AnnotationAccess

      `getAnnotation, hasAnnotation`

- - ### Method Detail

    - #### getInstance

          Object getInstance()

      The instance on which the method was originally invoked.

    - #### getInstanceContext

          InstanceContext getInstanceContext()

    - #### proceed

          MethodInvocation proceed()

      Proceed with the method invocation, either chaining into the next `MethodAdvice` added to the method, or ultimately into the actual method implementation. The method may throw a checked exception, which will be caught and be reported as `MethodInvocationResult.didThrowCheckedException()`.
      Returns:
        this method invocation, for a fluent API

    - #### setReturnValue

          MethodInvocation setReturnValue(Object returnValue)

      Overrides the return value of the method. The value provided will be cast to the actual return type (or, if the return type is a primitive value, the value will be cast to the corresponding wrapper type and then converted to a primitive). Overriding the return value clears any checked exception.
      Parameters:
        `returnValue` -
      Returns:
        this method invocation, for a fluent API
      Throws:
        `NullPointerException` - if the method's return type is a primitive and null is provided

    - #### getParameter

          Object getParameter(int index)

      Returns the parameter at the given index. Primitive types will be wrapped as they are returned.
      Parameters:
        `index` - of parameter to access
      Returns:
        parameter value

    - #### setParameter

          MethodInvocation setParameter(int index,
                                        Object newValue)

      Changes a parameter value. The value will be cast to the parameter's type. For primitive types, the value will be cast to the corresponding wrapper type.
      Parameters:
        `index` - index of parameter to modify
        `newValue` - new value for parameter
      Returns:
        this method invocation, for a fluent API

    - #### setCheckedException

          MethodInvocation setCheckedException(Exception exception)

      Sets the checked exception; this can be used to indicate failure for the method, or to cancel the thrown exception (by setting the exception to null).
      Parameters:
        `exception` - new checked exception, or null
      Returns:
        this method invocation, for a fluent API

    - #### getMethod

          Method getMethod()

      Returns the method being invoked.

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