/*
* Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package kdp.classparser.attributes;
import kdp.classparser.attributes.*;
import kdp.classparser.constantpoolclasses.*;
import java.io.*;
/**
* 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
*
*/
public class ConstantValueAttribute extends Attribute
{
/** index into the constant pool table containing the name
of this class */
private int attributeNameIndex;
/** length of this attribute in bytes */
private int attributeLength;
/** the constant pool entry at that index gives the constant
value represented by this attribute */
private int constantValueIndex;
/**
* 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
*/
public ConstantValueAttribute (DataInputStream iStream,
int attributeNameIndex, int attributeLength)
throws IOException
{
this.attributeNameIndex = attributeNameIndex;
this.attributeLength = attributeLength;
//read the constantValueIndex from the class file
constantValueIndex = iStream.readUnsignedShort ();
}
/**
* 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
*/
public String toString (final ConstantPoolInfo[] constantPool)
{
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;
}
}
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