org.apache.bcel.generic
Class ReferenceType
- java.io.Serializable
public abstract class ReferenceType
Super class for object and array types.
$Id: ReferenceType.java,v 1.5 2002/08/07 18:01:32 mdahm Exp $
BOOLEAN , BYTE , CHAR , DOUBLE , FLOAT , INT , LONG , NO_ARGS , NULL , OBJECT , SHORT , STRING , STRINGBUFFER , THROWABLE , UNKNOWN , VOID , signature , type |
ReferenceType
protected ReferenceType(byte t,
String s)
firstCommonSuperclass
public ReferenceType firstCommonSuperclass(ReferenceType t)
use getFirstCommonSuperclass(ReferenceType t) which has
slightly changed semantics.
This commutative operation returns the first common superclass (narrowest ReferenceType
referencing a class, not an interface).
If one of the types is a superclass of the other, the former is returned.
If "this" is Type.NULL, then t is returned.
If t is Type.NULL, then "this" is returned.
If "this" equals t ['this.equals(t)'] "this" is returned.
If "this" or t is an ArrayType, then Type.OBJECT is returned.
If "this" or t is a ReferenceType referencing an interface, then Type.OBJECT is returned.
If not all of the two classes' superclasses cannot be found, "null" is returned.
See the JVM specification edition 2, "?4.9.2 The Bytecode Verifier".
getFirstCommonSuperclass
public ReferenceType getFirstCommonSuperclass(ReferenceType t)
This commutative operation returns the first common superclass (narrowest ReferenceType
referencing a class, not an interface).
If one of the types is a superclass of the other, the former is returned.
If "this" is Type.NULL, then t is returned.
If t is Type.NULL, then "this" is returned.
If "this" equals t ['this.equals(t)'] "this" is returned.
If "this" or t is an ArrayType, then Type.OBJECT is returned;
unless their dimensions match. Then an ArrayType of the same
number of dimensions is returned, with its basic type being the
first common super class of the basic types of "this" and t.
If "this" or t is a ReferenceType referencing an interface, then Type.OBJECT is returned.
If not all of the two classes' superclasses cannot be found, "null" is returned.
See the JVM specification edition 2, "?4.9.2 The Bytecode Verifier".
isAssignmentCompatibleWith
public boolean isAssignmentCompatibleWith(Type t)
Return true iff this is assignment compatible with another type t
as defined in the JVM specification; see the AASTORE definition
there.
isCastableTo
public boolean isCastableTo(Type t)
Return true iff this type is castable to another type t as defined in
the JVM specification. The case where this is Type.NULL is not
defined (see the CHECKCAST definition in the JVM specification).
However, because e.g. CHECKCAST doesn't throw a
ClassCastException when casting a null reference to any Object,
true is returned in this case.