A type that matches some number of repetitions of a basetype.
coerceFromObject
public Object coerceFromObject(Object obj)
Convert an object to a value of this Type.
Throw a ClassCastException when this is not possible.
- coerceFromObject in interface ObjectType
compare
public int compare(Type other)
Return a numeric code showing "subtype" relationship:
1: if other is a pure subtype of this;
0: if has the same values;
-1: if this is a pure subtype of other;
-2: if they have values in common but neither is a subtype of the other;
-3: if the types have no values in common.
"Same member" is rather loose; by "A is a subtype of B"
we mean that all instance of A can be "widened" to B.
More formally, A.compare(B) returns:
1: all B values can be converted to A without a coercion failure
(i.e. a ClassCastException or overflow or major loss of information),
but not vice versa.
0: all A values can be converted to B without a coercion failure
and vice versa;
-1: all A values can be converted to B without a coercion failure
not not vice versa;
-2: there are (potentially) some A values that can be converted to B,
and some B values can be converted to A;
-3: there are no A values that can be converted to B, and neither
are there any B values that can be converted to A.
- compare in interface ObjectType
getBase
public Type getBase()
getImplementationType
public Type getImplementationType()
The type used to implement types not natively understood by the JVM.
Usually, the identity function. However, a language might handle
union types or template types or type expressions calculated at
run time. In that case return the type used at the JVM level,
and known at compile time.
- getImplementationType in interface TypeValue
- getImplementationType in interface ObjectType
getInstance
public static Type getInstance(Type base,
int minOccurs,
int maxOccurs)
itemCountCode
public static char itemCountCode(Type type)
Returna a quantifer kind for a sequence type.
- '0' if type is known to be a void (0-item) type;
'1' if type is known to be a single-item type;
'?' if type matches a sequence of 0 or 1 items;
'+' if type matches a sequence of 1 or more items;
'*' otherwise.
itemCountIsOne
public static boolean itemCountIsOne(Type type)
itemCountIsZeroOrOne
public static boolean itemCountIsZeroOrOne(Type type)
itemCountRange
public static int itemCountRange(Type type)
Return a conservative estimage on the min/max number of items of a type.
maxCount << 12 | minCount & 0xFFF
,
where a maxCount
of -1 means unbounded.
itemPrimeType
public static Type itemPrimeType(Type type)
QUery formal semantics "prime type"
maxOccurs
public int maxOccurs()
minOccurs
public int minOccurs()
readExternal
public void readExternal(ObjectInput in)
throws IOException,
ClassNotFoundException
writeExternal
public void writeExternal(ObjectOutput out)
throws IOException