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## com.opensymphony.xwork2.interceptor
Class ConversionErrorInterceptor

    java.lang.Object
      com.opensymphony.xwork2.interceptor.AbstractInterceptor
          com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor

All Implemented Interfaces:
  Interceptor, Serializable

    public class ConversionErrorInterceptor

extends AbstractInterceptor

ConversionErrorInterceptor adds conversion errors from the ActionContext to the Action's field errors.

This interceptor adds any error found in the `ActionContext`'s conversionErrors map as a field error (provided that the action implements `ValidationAware`). In addition, any field that contains a validation error has its original value saved such that any subsequent requests for that value return the original value rather than the value in the action. This is important because if the value "abc" is submitted and can't be converted to an int, we want to display the original string ("abc") again rather than the int value (likely 0, which would make very little sense to the user).

Interceptor parameters:

- None

Extending the interceptor:

Because this interceptor is not web-specific, it abstracts the logic for whether an error should be added. This allows for web-specific interceptors to use more complex logic in the `shouldAddError(java.lang.String, java.lang.Object)` method for when a value has a conversion error but is null or empty or otherwise indicates that the value was never actually entered by the user.

Example code:

     <action name="someAction" class="com.examples.SomeAction">
         <interceptor-ref name="params"/>
         <interceptor-ref name="conversionError"/>
         <result name="success">good_result.ftl</result>
     </action>

Author:
  Jason Carreira
See Also:
  Serialized Form

Field Summary
`static String` | `ORIGINAL_PROPERTY_OVERRIDE`

Constructor Summary
`ConversionErrorInterceptor()`

Method Summary
`protected String` | `escape(Object value)`
`protected Object` | `getOverrideExpr(ActionInvocation invocation, Object value)`
`String` | `intercept(ActionInvocation invocation)` Override to handle interception
`protected boolean` | `shouldAddError(String propertyName, Object value)`

Methods inherited from class com.opensymphony.xwork2.interceptor.AbstractInterceptor
`destroy, init`

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

Field Detail

### ORIGINAL_PROPERTY_OVERRIDE

    public static final String ORIGINAL_PROPERTY_OVERRIDE

See Also:
  Constant Field Values

Constructor Detail

### ConversionErrorInterceptor

    public ConversionErrorInterceptor()

Method Detail

### getOverrideExpr

    protected Object getOverrideExpr(ActionInvocation invocation,
                                     Object value)

### escape

    protected String escape(Object value)

### intercept

    public String intercept(ActionInvocation invocation)
                     throws Exception

  Description copied from class: `AbstractInterceptor`
  Override to handle interception

  Specified by:
    `intercept` in interface `Interceptor`
  Specified by:
    `intercept` in class `AbstractInterceptor`
  Parameters:
    `invocation` - the action invocation
  Returns:
    the return code, either returned from `ActionInvocation.invoke()`, or from the interceptor itself.
  Throws:
    `Exception` - any system-level error, as defined in `Action.execute()`.

### shouldAddError

    protected boolean shouldAddError(String propertyName,
                                     Object value)

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