diff options
Diffstat (limited to 'sampleUses/src/main/java/FixedLengthString.java')
-rw-r--r-- | sampleUses/src/main/java/FixedLengthString.java | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/sampleUses/src/main/java/FixedLengthString.java b/sampleUses/src/main/java/FixedLengthString.java new file mode 100644 index 0000000..bf7ba44 --- /dev/null +++ b/sampleUses/src/main/java/FixedLengthString.java @@ -0,0 +1,26 @@ +import java.lang.annotation.Documented; +import java.lang.annotation.Retention; +import java.lang.annotation.RetentionPolicy; + +import javax.annotation.meta.TypeQualifier; +import javax.annotation.meta.TypeQualifierValidator; +import javax.annotation.meta.When; + +@Documented +@TypeQualifier(applicableTo=String.class) +@Retention(RetentionPolicy.RUNTIME) +public @interface FixedLengthString { + int value(); + + class Checker implements TypeQualifierValidator<FixedLengthString> { + + public When forConstantValue(FixedLengthString annotation, Object v) { + if (!(v instanceof String)) + return When.NEVER; + String s = (String) v; + if (s.length() == annotation.value()) + return When.ALWAYS; + return When.NEVER; + } + } +}
\ No newline at end of file |