diff options
Diffstat (limited to 'ri/src/main/java/javax/annotation/Nonnegative.java')
-rw-r--r-- | ri/src/main/java/javax/annotation/Nonnegative.java | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/ri/src/main/java/javax/annotation/Nonnegative.java b/ri/src/main/java/javax/annotation/Nonnegative.java new file mode 100644 index 0000000..21d1793 --- /dev/null +++ b/ri/src/main/java/javax/annotation/Nonnegative.java @@ -0,0 +1,41 @@ +package javax.annotation; + +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; + +/** Used to annotate a value that should only contain nonnegative values */ +@Documented +@TypeQualifier(applicableTo = Number.class) +@Retention(RetentionPolicy.RUNTIME) +public @interface Nonnegative { + When when() default When.ALWAYS; + + class Checker implements TypeQualifierValidator<Nonnegative> { + + public When forConstantValue(Nonnegative annotation, Object v) { + if (!(v instanceof Number)) + return When.NEVER; + boolean isNegative; + Number value = (Number) v; + if (value instanceof Long) + isNegative = value.longValue() < 0; + else if (value instanceof Double) + isNegative = value.doubleValue() < 0; + else if (value instanceof Float) + isNegative = value.floatValue() < 0; + else + isNegative = value.intValue() < 0; + + if (isNegative) + return When.NEVER; + else + return When.ALWAYS; + + } + } +} |