DCONST.java Source File

00001 package de.fub.bytecode.generic;
00002 
00003 /** 
00004  * DCONST - Push 0.0 or 1.0, other values cause an exception
00005  *
00006  * <PRE>Stack: ... -&gt; ..., <i></PRE>
00007  *
00008  * @version $Id: DCONST.java,v 1.1.1.1 2002/01/24 03:44:02 pserver Exp $
00009  * @author  <A HREF="http://www.inf.fu-berlin.de/~dahm">M. Dahm</A>
00010  */
00011 public class DCONST extends Instruction implements ConstantPushInstruction {
00012   private double value;
00013 
00014   /**
00015    * Empty constructor needed for the Class.newInstance() statement in
00016    * Instruction.readInstruction(). Not to be used otherwise.
00017    */
00018   DCONST() {}  
00019   public DCONST(double f) {
00020     super(DCONST_0, (short)1);
00021 
00022     if(f == 0.0)
00023       tag = DCONST_0;
00024     else if(f == 1.0)
00025       tag = DCONST_1;
00026     else
00027       throw new ClassGenException("DCONST can be used only for 0.0 and 1.0: " + f);
00028 
00029     value = f;
00030   }  
00031   public Number getValue() { return new Double(value); }  
00032 }