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package javax.annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import javax.annotation.meta.TypeQualifierNickname;
import javax.annotation.meta.TypeQualifierValidator;
import javax.annotation.meta.When;
/**
* This qualifier is used to denote String values that should be a Regular
* expression.
*
*/
@Documented
@Syntax("RegEx")
@TypeQualifierNickname
@Retention(RetentionPolicy.RUNTIME)
public @interface RegEx {
When when() default When.ALWAYS;
static class Checker implements TypeQualifierValidator<RegEx> {
public When forConstantValue(RegEx annotation, Object value) {
if (!(value instanceof String))
return When.NEVER;
try {
Pattern.compile((String) value);
} catch (PatternSyntaxException e) {
return When.NEVER;
}
return When.ALWAYS;
}
}
}
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