com.opensymphony.xwork2.interceptor

## Class PrefixMethodInvocationUtil

- java.lang.Object
- - com.opensymphony.xwork2.interceptor.PrefixMethodInvocationUtil

-     public class PrefixMethodInvocationUtil
      extends Object

  A utility class for invoking prefixed methods in action class. Interceptors that made use of this class are:

  - DefaultWorkflowInterceptor
  - PrepareInterceptor
  * In DefaultWorkflowInterceptor

  applies only when action implements `Validateable`

  1. if the action class have validate{MethodName}(), it will be invoked
  2. else if the action class have validateDo{MethodName}(), it will be invoked
  3. no matter if 1] or 2] is performed, if alwaysInvokeValidate property of the interceptor is "true" (which is by default "true"), validate() will be invoked.
  In PrepareInterceptor

  Applies only when action implements Preparable

  1. if the action class have prepare{MethodName}(), it will be invoked
  2. else if the action class have prepareDo(MethodName()}(), it will be invoked
  3. no matter if 1] or 2] is performed, if alwaysinvokePrepare property of the interceptor is "true" (which is by default "true"), prepare() will be invoked.
  Author:
    Philip Luppens, tm_jee

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `PrefixMethodInvocationUtil()`

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static String` | `capitalizeMethodName(String methodName)` This method capitalized the first character of `methodName`.
    `static Method` | `getPrefixedMethod(String[] prefixes, String methodName, Object action)` This method returns a `Method` in `action`.
    `static void` | `invokePrefixMethod(ActionInvocation actionInvocation, String[] prefixes)` This method will prefix `actionInvocation`'s `ActionProxy`'s `method` with `prefixes` before invoking the prefixed method.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### PrefixMethodInvocationUtil

          public PrefixMethodInvocationUtil()

  - ### Method Detail

    - #### invokePrefixMethod

          public static void invokePrefixMethod(ActionInvocation actionInvocation,
                                                String[] prefixes)
                                         throws InvocationTargetException,
                                                IllegalAccessException

      This method will prefix `actionInvocation`'s `ActionProxy`'s `method` with `prefixes` before invoking the prefixed method. Order of the `prefixes` is important, as this method will return once a prefixed method is found in the action class.

      For example, with

             invokePrefixMethod(actionInvocation, new String[] { "prepare", "prepareDo" });

      Assuming `actionInvocation.getProxy(),getMethod()` returns "submit", the order of invocation would be as follows:-

      1. prepareSubmit()
      2. prepareDoSubmit()

      If `prepareSubmit()` exists, it will be invoked and this method will return, `prepareDoSubmit()` will NOT be invoked.

      On the other hand, if `prepareDoSubmit()` does not exists, and `prepareDoSubmit()` exists, it will be invoked.

      If none of those two methods exists, nothing will be invoked.

      Parameters:
        `actionInvocation` - the action invocation
        `prefixes` - prefixes for method names
      Throws:
        `InvocationTargetException` - is thrown if invocation of a method failed.
        `IllegalAccessException` - is thrown if invocation of a method failed.

    - #### getPrefixedMethod

          public static Method getPrefixedMethod(String[] prefixes,
                                                 String methodName,
                                                 Object action)

      This method returns a `Method` in `action`. The method returned is found by searching for method in `action` whose method name is equals to the result of appending each `prefixes` to `methodName`. Only the first method found will be returned, hence the order of `prefixes` is important. If none is found this method will return null.
      Parameters:
        `prefixes` - the prefixes to prefix the `methodName`
        `methodName` - the method name to be prefixed with `prefixes`
        `action` - the action class of which the prefixed method is to be search for.
      Returns:
        a `Method` if one is found, else `null`.

    - #### capitalizeMethodName

          public static String capitalizeMethodName(String methodName)

      This method capitalized the first character of `methodName`.
      eg. `capitalizeMethodName("someMethod");` will return `"SomeMethod"`.

      Parameters:
        `methodName` - the method name
      Returns:
        capitalized method name

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