1 /* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5 /* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22 package com.sun.org.apache.bcel.internal.generic; 23 24 25 /** 26 * DCONST - Push 0.0 or 1.0, other values cause an exception 27 * 28 * <PRE>Stack: ... -> ..., </PRE> 29 * 30 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 31 */ 32 public class DCONST extends Instruction 33 implements ConstantPushInstruction, TypedInstruction { 34 private double value; 35 36 /** 37 * Empty constructor needed for the Class.newInstance() statement in 38 * Instruction.readInstruction(). Not to be used otherwise. 39 */ 40 DCONST() {} 41 42 public DCONST(double f) { 43 super(com.sun.org.apache.bcel.internal.Constants.DCONST_0, (short)1); 44 45 if(f == 0.0) 46 opcode = com.sun.org.apache.bcel.internal.Constants.DCONST_0; 47 else if(f == 1.0) 48 opcode = com.sun.org.apache.bcel.internal.Constants.DCONST_1; 49 else 50 throw new ClassGenException("DCONST can be used only for 0.0 and 1.0: " + f); 51 52 value = f; 53 } 54 55 public Number getValue() { return new Double(value); } 56 57 /** @return Type.DOUBLE 58 */ 59 public Type getType(ConstantPoolGen cp) { 60 return Type.DOUBLE; 61 } 62 63 /** 64 * Call corresponding visitor method(s). The order is: 65 * Call visitor methods of implemented interfaces first, then 66 * call methods according to the class hierarchy in descending order, 67 * i.e., the most specific visitXXX() call comes last. 68 * 69 * @param v Visitor object 70 */ 71 public void accept(Visitor v) { 72 v.visitPushInstruction(this); 73 v.visitStackProducer(this); 74 v.visitTypedInstruction(this); 75 v.visitConstantPushInstruction(this); 76 v.visitDCONST(this); 77 } 78 }