Class ParameterRemoverInterceptor

java.lang.Object
org.apache.struts2.interceptor.AbstractInterceptor
org.apache.struts2.interceptor.ParameterRemoverInterceptor
All Implemented Interfaces:
Serializable, ConditionalInterceptor, Interceptor

public class ParameterRemoverInterceptor extends AbstractInterceptor
This is a simple XWork interceptor that allows parameters (matching one of the paramNames attribute csv value) to be removed from the parameter map if they match a certain value (matching one of the paramValues attribute csv value), before they are set on the action. A typical usage would be to want a dropdown/select to map onto a boolean value on an action. The select had the options none, yes and no with values -1, true and false. The true and false would map across correctly. However the -1 would be set to false. This was not desired as one might needed the value on the action to stay null. This interceptor fixes this by preventing the parameter from ever reaching the action.
  • paramNames - A comma separated value (csv) indicating the parameter name whose param value should be considered that if they match any of the comma separated value (csv) from paramValues attribute, shall be removed from the parameter map such that they will not be applied to the action
  • paramValues - A comma separated value (csv) indicating the parameter value that if matched shall have its parameter be removed from the parameter map such that they will not be applied to the action

No intended extension point

 <action name="sample" class="org.martingilday.Sample">
        <interceptor-ref name="paramRemover">
          <param name="paramNames">aParam,anotherParam</param>
          <param name="paramValues">--,-1</param>
        </interceptor-ref>
        <interceptor-ref name="defaultStack" />
        ...
 </action>
 
See Also:
  • Constructor Details

    • ParameterRemoverInterceptor

      public ParameterRemoverInterceptor()
  • Method Details

    • intercept

      public String intercept(ActionInvocation invocation) throws Exception
      Decide if the parameter should be removed from the parameter map based on paramNames and paramValues.
      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().
      See Also:
    • setParamNames

      public void setParamNames(String paramNames)
      Allows paramNames attribute to be set as comma-separated-values (csv).
      Parameters:
      paramNames - the paramNames to set
    • setParamValues

      public void setParamValues(String paramValues)
      Allows paramValues attribute to be set as a comma-separated-values (csv).
      Parameters:
      paramValues - the paramValues to set