/* * Copyright (c) 2000 Sun Microsystems, Inc., 901 San Antonio Road, * Palo Alto, CA 94303, U.S.A. All Rights Reserved. * * Sun Microsystems, Inc. has intellectual property rights relating * to the technology embodied in this software. In particular, and * without limitation, these intellectual property rights may include * one or more U.S. patents, foreign patents, or pending * applications. Sun, Sun Microsystems, the Sun logo, Java, KJava, * and all Sun-based and Java-based marks are trademarks or * registered trademarks of Sun Microsystems, Inc. in the United * States and other countries. * * This software is distributed under licenses restricting its use, * copying, distribution, and decompilation. No part of this * software may be reproduced in any form by any means without prior * written authorization of Sun and its licensors, if any. * * FEDERAL ACQUISITIONS: Commercial Software -- Government Users * Subject to Standard License Terms and Conditions */ 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; } }
