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CHECKCAST.javaAPI DocJava SE 5 API4796Fri Aug 26 14:55:18 BST 2005com.sun.org.apache.bcel.internal.generic

CHECKCAST

public class CHECKCAST extends CPInstruction implements ExceptionThrower, StackProducer, LoadClass, StackConsumer
CHECKCAST - Check whether object is of given type 
Stack: ..., objectref -> ..., objectref
version
$Id: CHECKCAST.java,v 1.1.1.1 2001/10/29 20:00:07 jvanzyl Exp $
author
M. Dahm

Fields Summary
Constructors Summary
CHECKCAST()
Empty constructor needed for the Class.newInstance() statement in Instruction.readInstruction(). Not to be used otherwise.

public CHECKCAST(int index)
Check whether object is of given type
param
n index to class in constant pool
    super(com.sun.org.apache.bcel.internal.Constants.CHECKCAST, index);
  
Methods Summary
public voidaccept(com.sun.org.apache.bcel.internal.generic.Visitor v)
Call corresponding visitor method(s). The order is:
Call visitor methods of implemented interfaces first, then
call methods according to the class hierarchy in descending order,
i.e., the most specific visitXXX() call comes last.
param
v Visitor object
    v.visitLoadClass(this);
    v.visitExceptionThrower(this);
    v.visitStackProducer(this);
    v.visitStackConsumer(this);
    v.visitTypedInstruction(this);
    v.visitCPInstruction(this);
    v.visitCHECKCAST(this);
  
public java.lang.Class[]getExceptions()
return
exceptions this instruction may cause
    Class[] cs = new Class[1 + ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length];

    System.arraycopy(ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION, 0,
		     cs, 0, ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length);
    cs[ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length] =
      ExceptionConstants.CLASS_CAST_EXCEPTION;
    return cs;
  
public com.sun.org.apache.bcel.internal.generic.ObjectTypegetLoadClassType(com.sun.org.apache.bcel.internal.generic.ConstantPoolGen cpg)
    Type t = getType(cpg);

    if(t instanceof ArrayType)
      t = ((ArrayType) t).getBasicType();

    return (t instanceof ObjectType)? (ObjectType) t : null;