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

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