org.apache.bcel.generic

Class ReferenceType

public abstract class ReferenceType extends Type

Super class for object and array types.
Constructor Summary
protected ReferenceType(byte t, String s)
Method Summary
ReferenceTypefirstCommonSuperclass(ReferenceType t)
This commutative operation returns the first common superclass (narrowest ReferenceType referencing a class, not an interface).
ReferenceTypegetFirstCommonSuperclass(ReferenceType t)
This commutative operation returns the first common superclass (narrowest ReferenceType referencing a class, not an interface).
booleanisAssignmentCompatibleWith(Type t)
Return true iff this is assignment compatible with another type t as defined in the JVM specification; see the AASTORE definition there.
booleanisCastableTo(Type t)
Return true iff this type is castable to another type t as defined in the JVM specification.

Constructor Detail

ReferenceType

protected ReferenceType(byte t, String s)

Method Detail

firstCommonSuperclass

public ReferenceType firstCommonSuperclass(ReferenceType t)

Deprecated: 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".

Throws: ClassNotFoundException on failure to find superclasses of this type, or the type passed as a parameter

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".

Throws: ClassNotFoundException on failure to find superclasses of this type, or the type passed as a parameter

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.

Throws: ClassNotFoundException if any classes or interfaces required to determine assignment compatibility can't be found

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.

Throws: ClassNotFoundException if any classes or interfaces required to determine assignment compatibility can't be found