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ConstantFloatInfo.javaAPI DocJ2ME CLDC 1.12141Wed Feb 05 15:56:04 GMT 2003kdp.classparser.constantpoolclasses

ConstantFloatInfo

public class ConstantFloatInfo extends ConstantPoolInfo
Encapsulates a CONSTANT_Float in a Java class file constant pool.
author
Aaron Dietrich
version
$Id: ConstantFloatInfo.java,v 1.1.1.1 2000/07/07 13:34:24 jrv Exp $ Revision History $Log: ConstantFloatInfo.java,v $ Revision 1.1.1.1 2000/07/07 13:34:24 jrv Initial import of kdp code Revision 1.1.1.1 2000/05/31 19:14:48 ritsun Initial import of kvmdt to CVS Revision 1.1 2000/04/25 00:34:06 ritsun Initial revision

Fields Summary
private int
bytes
the bytes that make up this field
Constructors Summary
public ConstantFloatInfo(DataInputStream iStream)
Constructor. Creates the constant float info object.

param
iStream input stream to read from
exception
IOException just pass IOExceptions up.

      tag = ConstantPoolInfo.CONSTANT_Float;

      bytes = iStream.readInt ();
Methods Summary
public java.lang.StringtoString()
Returns this ConstantFloatInfo as a string for displaying. Converted to a float as specified in the JVM Specification

return
String the float as a string.

      if (bytes == 0x7f800000)
        return ("CONSTANT_Float=\t" + "Positive Infinity");

      if (bytes == 0xff800000)
        return ("CONSTANT_Float=\t" + "Negative Infinity");

      if (((bytes >= 0x7f800001) && (bytes <= 0x7fffffff)) ||
          ((bytes >= 0xff800001) && (bytes <= 0xffffffff)))
        return ("CONSTANT_Float=\t" + "NaN");

      int s = ((bytes >> 31) == 0) ? 1 : -1;
      int e = ((bytes >> 23) & 0xff);
      int m = (e == 0) ? (bytes & 0x7fffff) << 1 :
                         (bytes & 0x7fffff) | 0x800000;

      float    value = s * m * (2^(e - 150));

      return ("CONSTANT_Float=\t" + value);