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ConstantValueAttribute.javaAPI DocJ2ME CLDC 1.14101Wed Feb 05 15:56:04 GMT 2003kdp.classparser.attributes

ConstantValueAttribute

public class ConstantValueAttribute extends Attribute
Encapsulates the ConstantValue attribute of a Java class file.
author
Aaron Dietrich
version
$Id: ConstantValueAttribute.java,v 1.1.1.1 2000/07/07 13:34:23 jrv Exp $ Revision History $Log: ConstantValueAttribute.java,v $ Revision 1.1.1.1 2000/07/07 13:34:23 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 00:30:39 ritsun Initial revision

Fields Summary
private int
attributeNameIndex
index into the constant pool table containing the name of this class
private int
attributeLength
length of this attribute in bytes
private int
constantValueIndex
the constant pool entry at that index gives the constant value represented by this attribute
Constructors Summary
public ConstantValueAttribute(DataInputStream iStream, int attributeNameIndex, int attributeLength)
Constructor. Reads the ConstantValue attribute from the class file.

param
iStream the input stream on which to read the class file
param
attributeNameIndex attributeNameIndex member of attribute structure.
param
attributeLength attributeLength member of attribute structure.
exception
IOException pass IOExceptions up

      this.attributeNameIndex = attributeNameIndex;
      this.attributeLength = attributeLength;

      //read the constantValueIndex from the class file
      constantValueIndex = iStream.readUnsignedShort ();
Methods Summary
public java.lang.StringtoString(ConstantPoolInfo[] constantPool)
Returns the ConstantValue attribute in a nice easy to read format as a string.

param
constantPool constant pool of the class file
return
String the attribute as a nice easy to read String

      String                s = new String ("");

      ConstantUtf8Info    utf8Info = (ConstantUtf8Info)
                                             constantPool[attributeNameIndex];
      s = s + utf8Info.toString () + "\n\t\t\t";

      ConstantPoolInfo   cpInfo = (ConstantPoolInfo)
                                             constantPool[constantValueIndex];

      switch (cpInfo.getTag())
        {
         case ConstantPoolInfo.CONSTANT_Long :
           {
            ConstantLongInfo cpInfo2 = (ConstantLongInfo) cpInfo;
            s = s + cpInfo2.toString ();
            break;
           }

         case ConstantPoolInfo.CONSTANT_Float :
           {
            ConstantFloatInfo cpInfo2 = (ConstantFloatInfo) cpInfo;
            s = s + cpInfo2.toString ();
            break;
           }

         case ConstantPoolInfo.CONSTANT_Double :
           {
            ConstantDoubleInfo cpInfo2 = (ConstantDoubleInfo) cpInfo;
            s = s + cpInfo2.toString ();
            break;
           }

         case ConstantPoolInfo.CONSTANT_Integer :
           {
            ConstantIntegerInfo cpInfo2 = (ConstantIntegerInfo) cpInfo;
            s = s + cpInfo2.toString ();
            break;
           }

         case ConstantPoolInfo.CONSTANT_String :
           {
            ConstantStringInfo      cpInfo2 = (ConstantStringInfo) cpInfo;
            s = s + cpInfo2.toString (constantPool);
            break;
           }
        }
      return s;