org.hibernate.validator.constraints

Annotation Type ParameterScriptAssert

@Target(value={CONSTRUCTOR,METHOD})
 @Retention(value=RUNTIME)
 @Constraint(validatedBy={})
 @Documented
public @interface ParameterScriptAssert

A method-level constraint, that evaluates a script expression against the annotated method or constructor. This constraint can be used to implement validation routines that depend on several parameters of the annotated executable.

Script expressions can be written in any scripting or expression language, for which a JSR 223 ("Scripting for the Java^TM Platform") compatible engine can be found on the classpath. To refer to a parameter within the scripting expression, use its name as obtained by the active ParameterNameProvider. By default, arg0, arg1 etc. will be used as parameter names.

The following listing shows an example using the JavaScript engine which comes with the JDK:

  @ParameterScriptAssert(script = "arg0.before(arg1)", lang = "javascript")
 public void createEvent(Date start, Date end) { ... }
 
 

Can be specified on any method or constructor.

Author:

Gunnar Morling

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
String	lang
String	script

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
Class<?>[]	groups
String	message
Class<? extends Payload>[]	payload

Element Detail

lang

public abstract String lang

Returns:

The name of the script language used by this constraint as expected by the JSR 223 ScriptEngineManager. A ConstraintDeclarationException will be thrown upon script evaluation, if no engine for the given language could be found.

script

public abstract String script

Returns:

The script to be executed. The script must return Boolean.TRUE, if the executable parameters could successfully be validated, otherwise Boolean.FALSE. Returning null or any type other than Boolean will cause a ConstraintDeclarationException upon validation. Any exception occurring during script evaluation will be wrapped into a ConstraintDeclarationException, too. Within the script, the validated parameters can be accessed using their names as retrieved from the active ParameterNameProvider.

message

public abstract String message

Default:

"{org.hibernate.validator.constraints.ParametersScriptAssert.message}"

groups

public abstract Class<?>[] groups

Default:

{}

payload

public abstract Class<? extends Payload>[] payload

Default:

{}